25 files changed, 452 insertions, 343 deletions

diff --git a/server/middlewares/validators/abuse.ts b/server/middlewares/validators/abuse.ts
index 3b897fdef..7f002e0d5 100644
--- a/server/middlewares/validators/abuse.ts
+++ b/server/middlewares/validators/abuse.ts
@@ -71,9 +71,7 @@ const abuseReportValidator = [
     if (body.comment?.id && !await doesCommentIdExist(body.comment.id, res)) return
 
     if (!body.video?.id && !body.account?.id && !body.comment?.id) {
-      res.status(HttpStatusCode.BAD_REQUEST_400)
-         .json({ error: 'video id or account id or comment id is required.' })
-
+      res.fail({ message: 'video id or account id or comment id is required.' })
       return
     }
 
@@ -195,8 +193,10 @@ const getAbuseValidator = [
       const message = `User ${user.username} does not have right to get abuse ${abuse.id}`
       logger.warn(message)
 
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-                .json({ error: message })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message
+      })
     }
 
     return next()
@@ -209,10 +209,7 @@ const checkAbuseValidForMessagesValidator = [
 
     const abuse = res.locals.abuse
     if (abuse.ReporterAccount.isOwned() === false) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({
-                  error: 'This abuse was created by a user of your instance.'
-                })
+      return res.fail({ message: 'This abuse was created by a user of your instance.' })
     }
 
     return next()
@@ -246,13 +243,17 @@ const deleteAbuseMessageValidator = [
     const abuseMessage = await AbuseMessageModel.loadByIdAndAbuseId(messageId, abuse.id)
 
     if (!abuseMessage) {
-      return res.status(HttpStatusCode.NOT_FOUND_404)
-                .json({ error: 'Abuse message not found' })
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Abuse message not found'
+      })
     }
 
     if (user.hasRight(UserRight.MANAGE_ABUSES) !== true && abuseMessage.accountId !== user.Account.id) {
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-                .json({ error: 'Cannot delete this abuse message' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Cannot delete this abuse message'
+      })
     }
 
     res.locals.abuseMessage = abuseMessage
diff --git a/server/middlewares/validators/activitypub/activity.ts b/server/middlewares/validators/activitypub/activity.ts
index e78ef07ef..59355e855 100644
--- a/server/middlewares/validators/activitypub/activity.ts
+++ b/server/middlewares/validators/activitypub/activity.ts
@@ -10,7 +10,7 @@ async function activityPubValidator (req: express.Request, res: express.Response
   if (!isRootActivityValid(req.body)) {
     logger.warn('Incorrect activity parameters.', { activity: req.body })
     return res.status(HttpStatusCode.BAD_REQUEST_400)
-              .json({ error: 'Incorrect activity.' })
+              .end()
   }
 
   const serverActor = await getServerActor()
diff --git a/server/middlewares/validators/blocklist.ts b/server/middlewares/validators/blocklist.ts
index f61811a1a..125ff882c 100644
--- a/server/middlewares/validators/blocklist.ts
+++ b/server/middlewares/validators/blocklist.ts
@@ -24,9 +24,10 @@ const blockAccountValidator = [
     const accountToBlock = res.locals.account
 
     if (user.Account.id === accountToBlock.id) {
-      res.status(HttpStatusCode.CONFLICT_409)
-         .json({ error: 'You cannot block yourself.' })
-
+      res.fail({
+        status: HttpStatusCode.CONFLICT_409,
+        message: 'You cannot block yourself.'
+      })
       return
     }
 
@@ -79,8 +80,10 @@ const blockServerValidator = [
     const host: string = req.body.host
 
     if (host === WEBSERVER.HOST) {
-      return res.status(HttpStatusCode.CONFLICT_409)
-        .json({ error: 'You cannot block your own server.' })
+      return res.fail({
+        status: HttpStatusCode.CONFLICT_409,
+        message: 'You cannot block your own server.'
+      })
     }
 
     const server = await ServerModel.loadOrCreateByHost(host)
@@ -137,27 +140,27 @@ export {
 async function doesUnblockAccountExist (accountId: number, targetAccountId: number, res: express.Response) {
   const accountBlock = await AccountBlocklistModel.loadByAccountAndTarget(accountId, targetAccountId)
   if (!accountBlock) {
-    res.status(HttpStatusCode.NOT_FOUND_404)
-       .json({ error: 'Account block entry not found.' })
-
+    res.fail({
+      status: HttpStatusCode.NOT_FOUND_404,
+      message: 'Account block entry not found.'
+    })
     return false
   }
 
   res.locals.accountBlock = accountBlock
-
   return true
 }
 
 async function doesUnblockServerExist (accountId: number, host: string, res: express.Response) {
   const serverBlock = await ServerBlocklistModel.loadByAccountAndHost(accountId, host)
   if (!serverBlock) {
-    res.status(HttpStatusCode.NOT_FOUND_404)
-       .json({ error: 'Server block entry not found.' })
-
+    res.fail({
+      status: HttpStatusCode.NOT_FOUND_404,
+      message: 'Server block entry not found.'
+    })
     return false
   }
 
   res.locals.serverBlock = serverBlock
-
   return true
 }
diff --git a/server/middlewares/validators/bulk.ts b/server/middlewares/validators/bulk.ts
index cfb16d352..847885101 100644
--- a/server/middlewares/validators/bulk.ts
+++ b/server/middlewares/validators/bulk.ts
@@ -23,9 +23,9 @@ const bulkRemoveCommentsOfValidator = [
     const body = req.body as BulkRemoveCommentsOfBody
 
     if (body.scope === 'instance' && user.hasRight(UserRight.REMOVE_ANY_VIDEO_COMMENT) !== true) {
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-      .json({
-        error: 'User cannot remove any comments of this instance.'
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'User cannot remove any comments of this instance.'
       })
     }
 
diff --git a/server/middlewares/validators/config.ts b/server/middlewares/validators/config.ts
index e3e0c2058..b5d6b4622 100644
--- a/server/middlewares/validators/config.ts
+++ b/server/middlewares/validators/config.ts
@@ -2,7 +2,6 @@ import * as express from 'express'
 import { body } from 'express-validator'
 import { isIntOrNull } from '@server/helpers/custom-validators/misc'
 import { isEmailEnabled } from '@server/initializers/config'
-import { HttpStatusCode } from '../../../shared/core-utils/miscs/http-error-codes'
 import { CustomConfig } from '../../../shared/models/server/custom-config.model'
 import { isThemeNameValid } from '../../helpers/custom-validators/plugins'
 import { isUserNSFWPolicyValid, isUserVideoQuotaDailyValid, isUserVideoQuotaValid } from '../../helpers/custom-validators/users'
@@ -115,9 +114,7 @@ function checkInvalidConfigIfEmailDisabled (customConfig: CustomConfig, res: exp
   if (isEmailEnabled()) return true
 
   if (customConfig.signup.requiresEmailVerification === true) {
-    res.status(HttpStatusCode.BAD_REQUEST_400)
-       .send({ error: 'Emailer is disabled but you require signup email verification.' })
-       .end()
+    res.fail({ message: 'Emailer is disabled but you require signup email verification.' })
     return false
   }
 
@@ -128,9 +125,7 @@ function checkInvalidTranscodingConfig (customConfig: CustomConfig, res: express
   if (customConfig.transcoding.enabled === false) return true
 
   if (customConfig.transcoding.webtorrent.enabled === false && customConfig.transcoding.hls.enabled === false) {
-    res.status(HttpStatusCode.BAD_REQUEST_400)
-       .send({ error: 'You need to enable at least webtorrent transcoding or hls transcoding' })
-       .end()
+    res.fail({ message: 'You need to enable at least webtorrent transcoding or hls transcoding' })
     return false
   }
 
@@ -141,9 +136,7 @@ function checkInvalidLiveConfig (customConfig: CustomConfig, res: express.Respon
   if (customConfig.live.enabled === false) return true
 
   if (customConfig.live.allowReplay === true && customConfig.transcoding.enabled === false) {
-    res.status(HttpStatusCode.BAD_REQUEST_400)
-       .send({ error: 'You cannot allow live replay if transcoding is not enabled' })
-       .end()
+    res.fail({ message: 'You cannot allow live replay if transcoding is not enabled' })
     return false
   }
 
diff --git a/server/middlewares/validators/feeds.ts b/server/middlewares/validators/feeds.ts
index 617661813..aa16cc993 100644
--- a/server/middlewares/validators/feeds.ts
+++ b/server/middlewares/validators/feeds.ts
@@ -36,10 +36,10 @@ function setFeedFormatContentType (req: express.Request, res: express.Response,
   if (req.accepts(acceptableContentTypes)) {
     res.set('Content-Type', req.accepts(acceptableContentTypes) as string)
   } else {
-    return res.status(HttpStatusCode.NOT_ACCEPTABLE_406)
-              .json({
-                message: `You should accept at least one of the following content-types: ${acceptableContentTypes.join(', ')}`
-              })
+    return res.fail({
+      status: HttpStatusCode.NOT_ACCEPTABLE_406,
+      message: `You should accept at least one of the following content-types: ${acceptableContentTypes.join(', ')}`
+    })
   }
 
   return next()
@@ -106,10 +106,7 @@ const videoCommentsFeedsValidator = [
     if (areValidationErrors(req, res)) return
 
     if (req.query.videoId && (req.query.videoChannelId || req.query.videoChannelName)) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({
-                  message: 'videoId cannot be mixed with a channel filter'
-                })
+      return res.fail({ message: 'videoId cannot be mixed with a channel filter' })
     }
 
     if (req.query.videoId && !await doesVideoExist(req.query.videoId, res)) return
diff --git a/server/middlewares/validators/follows.ts b/server/middlewares/validators/follows.ts
index 1d18de8cd..733be379b 100644
--- a/server/middlewares/validators/follows.ts
+++ b/server/middlewares/validators/follows.ts
@@ -63,11 +63,10 @@ const removeFollowingValidator = [
     const follow = await ActorFollowModel.loadByActorAndTargetNameAndHostForAPI(serverActor.id, SERVER_ACTOR_NAME, req.params.host)
 
     if (!follow) {
-      return res
-        .status(HttpStatusCode.NOT_FOUND_404)
-        .json({
-          error: `Following ${req.params.host} not found.`
-        })
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: `Following ${req.params.host} not found.`
+      })
     }
 
     res.locals.follow = follow
@@ -95,12 +94,10 @@ const getFollowerValidator = [
     }
 
     if (!follow) {
-      return res
-        .status(HttpStatusCode.NOT_FOUND_404)
-        .json({
-          error: `Follower ${req.params.nameWithHost} not found.`
-        })
-        .end()
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: `Follower ${req.params.nameWithHost} not found.`
+      })
     }
 
     res.locals.follow = follow
@@ -114,12 +111,7 @@ const acceptOrRejectFollowerValidator = [
 
     const follow = res.locals.follow
     if (follow.state !== 'pending') {
-      return res
-        .status(HttpStatusCode.BAD_REQUEST_400)
-        .json({
-          error: 'Follow is not in pending state.'
-        })
-        .end()
+      return res.fail({ message: 'Follow is not in pending state.' })
     }
 
     return next()
diff --git a/server/middlewares/validators/oembed.ts b/server/middlewares/validators/oembed.ts
index 165eda6d5..b1d763fbe 100644
--- a/server/middlewares/validators/oembed.ts
+++ b/server/middlewares/validators/oembed.ts
@@ -51,8 +51,13 @@ const oembedValidator = [
     if (areValidationErrors(req, res)) return
 
     if (req.query.format !== undefined && req.query.format !== 'json') {
-      return res.status(HttpStatusCode.NOT_IMPLEMENTED_501)
-        .json({ error: 'Requested format is not implemented on server.' })
+      return res.fail({
+        status: HttpStatusCode.NOT_IMPLEMENTED_501,
+        message: 'Requested format is not implemented on server.',
+        data: {
+          format: req.query.format
+        }
+      })
     }
 
     const url = req.query.url as string
@@ -65,27 +70,35 @@ const oembedValidator = [
     const matches = watchRegex.exec(url)
 
     if (startIsOk === false || matches === null) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-        .json({ error: 'Invalid url.' })
+      return res.fail({
+        status: HttpStatusCode.BAD_REQUEST_400,
+        message: 'Invalid url.',
+        data: {
+          url
+        }
+      })
     }
 
     const elementId = matches[1]
     if (isIdOrUUIDValid(elementId) === false) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-        .json({ error: 'Invalid video or playlist id.' })
+      return res.fail({ message: 'Invalid video or playlist id.' })
     }
 
     if (isVideo) {
       const video = await fetchVideo(elementId, 'all')
 
       if (!video) {
-        return res.status(HttpStatusCode.NOT_FOUND_404)
-          .json({ error: 'Video not found' })
+        return res.fail({
+          status: HttpStatusCode.NOT_FOUND_404,
+          message: 'Video not found'
+        })
       }
 
       if (video.privacy !== VideoPrivacy.PUBLIC) {
-        return res.status(HttpStatusCode.FORBIDDEN_403)
-          .json({ error: 'Video is not public' })
+        return res.fail({
+          status: HttpStatusCode.FORBIDDEN_403,
+          message: 'Video is not public'
+        })
       }
 
       res.locals.videoAll = video
@@ -96,13 +109,17 @@ const oembedValidator = [
 
     const videoPlaylist = await VideoPlaylistModel.loadWithAccountAndChannelSummary(elementId, undefined)
     if (!videoPlaylist) {
-      return res.status(HttpStatusCode.NOT_FOUND_404)
-        .json({ error: 'Video playlist not found' })
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Video playlist not found'
+      })
     }
 
     if (videoPlaylist.privacy !== VideoPlaylistPrivacy.PUBLIC) {
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-        .json({ error: 'Playlist is not public' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Playlist is not public'
+      })
     }
 
     res.locals.videoPlaylistSummary = videoPlaylist
diff --git a/server/middlewares/validators/plugins.ts b/server/middlewares/validators/plugins.ts
index 2c47ec5bb..5934a28bc 100644
--- a/server/middlewares/validators/plugins.ts
+++ b/server/middlewares/validators/plugins.ts
@@ -31,8 +31,18 @@ const getPluginValidator = (pluginType: PluginType, withVersion = true) => {
       const npmName = PluginModel.buildNpmName(req.params.pluginName, pluginType)
       const plugin = PluginManager.Instance.getRegisteredPluginOrTheme(npmName)
 
-      if (!plugin) return res.sendStatus(HttpStatusCode.NOT_FOUND_404)
-      if (withVersion && plugin.version !== req.params.pluginVersion) return res.sendStatus(HttpStatusCode.NOT_FOUND_404)
+      if (!plugin) {
+        return res.fail({
+          status: HttpStatusCode.NOT_FOUND_404,
+          message: 'No plugin found named ' + npmName
+        })
+      }
+      if (withVersion && plugin.version !== req.params.pluginVersion) {
+        return res.fail({
+          status: HttpStatusCode.NOT_FOUND_404,
+          message: 'No plugin found named ' + npmName + ' with version ' + req.params.pluginVersion
+        })
+      }
 
       res.locals.registeredPlugin = plugin
 
@@ -50,10 +60,20 @@ const getExternalAuthValidator = [
     if (areValidationErrors(req, res)) return
 
     const plugin = res.locals.registeredPlugin
-    if (!plugin.registerHelpers) return res.sendStatus(HttpStatusCode.NOT_FOUND_404)
+    if (!plugin.registerHelpers) {
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'No registered helpers were found for this plugin'
+      })
+    }
 
     const externalAuth = plugin.registerHelpers.getExternalAuths().find(a => a.authName === req.params.authName)
-    if (!externalAuth) return res.sendStatus(HttpStatusCode.NOT_FOUND_404)
+    if (!externalAuth) {
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'No external auths were found for this plugin'
+      })
+    }
 
     res.locals.externalAuth = externalAuth
 
@@ -107,8 +127,7 @@ const installOrUpdatePluginValidator = [
 
     const body: InstallOrUpdatePlugin = req.body
     if (!body.path && !body.npmName) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({ error: 'Should have either a npmName or a path' })
+      return res.fail({ message: 'Should have either a npmName or a path' })
     }
 
     return next()
@@ -137,12 +156,13 @@ const existingPluginValidator = [
 
     const plugin = await PluginModel.loadByNpmName(req.params.npmName)
     if (!plugin) {
-      return res.status(HttpStatusCode.NOT_FOUND_404)
-                .json({ error: 'Plugin not found' })
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Plugin not found'
+      })
     }
 
     res.locals.plugin = plugin
-
     return next()
   }
 ]
@@ -177,9 +197,7 @@ const listAvailablePluginsValidator = [
     if (areValidationErrors(req, res)) return
 
     if (CONFIG.PLUGINS.INDEX.ENABLED === false) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({ error: 'Plugin index is not enabled' })
-                .end()
+      return res.fail({ message: 'Plugin index is not enabled' })
     }
 
     return next()
diff --git a/server/middlewares/validators/redundancy.ts b/server/middlewares/validators/redundancy.ts
index c379aebe4..3d557048a 100644
--- a/server/middlewares/validators/redundancy.ts
+++ b/server/middlewares/validators/redundancy.ts
@@ -35,11 +35,21 @@ const videoFileRedundancyGetValidator = [
       return f.resolution === paramResolution && (!req.params.fps || paramFPS)
     })
 
-    if (!videoFile) return res.status(HttpStatusCode.NOT_FOUND_404).json({ error: 'Video file not found.' })
+    if (!videoFile) {
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Video file not found.'
+      })
+    }
     res.locals.videoFile = videoFile
 
     const videoRedundancy = await VideoRedundancyModel.loadLocalByFileId(videoFile.id)
-    if (!videoRedundancy) return res.status(HttpStatusCode.NOT_FOUND_404).json({ error: 'Video redundancy not found.' })
+    if (!videoRedundancy) {
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Video redundancy not found.'
+      })
+    }
     res.locals.videoRedundancy = videoRedundancy
 
     return next()
@@ -65,11 +75,21 @@ const videoPlaylistRedundancyGetValidator = [
     const paramPlaylistType = req.params.streamingPlaylistType as unknown as number // We casted to int above
     const videoStreamingPlaylist = video.VideoStreamingPlaylists.find(p => p.type === paramPlaylistType)
 
-    if (!videoStreamingPlaylist) return res.status(HttpStatusCode.NOT_FOUND_404).json({ error: 'Video playlist not found.' })
+    if (!videoStreamingPlaylist) {
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Video playlist not found.'
+      })
+    }
     res.locals.videoStreamingPlaylist = videoStreamingPlaylist
 
     const videoRedundancy = await VideoRedundancyModel.loadLocalByStreamingPlaylistId(videoStreamingPlaylist.id)
-    if (!videoRedundancy) return res.status(HttpStatusCode.NOT_FOUND_404).json({ error: 'Video redundancy not found.' })
+    if (!videoRedundancy) {
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Video redundancy not found.'
+      })
+    }
     res.locals.videoRedundancy = videoRedundancy
 
     return next()
@@ -90,12 +110,10 @@ const updateServerRedundancyValidator = [
     const server = await ServerModel.loadByHost(req.params.host)
 
     if (!server) {
-      return res
-        .status(HttpStatusCode.NOT_FOUND_404)
-        .json({
-          error: `Server ${req.params.host} not found.`
-        })
-        .end()
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: `Server ${req.params.host} not found.`
+      })
     }
 
     res.locals.server = server
@@ -129,19 +147,19 @@ const addVideoRedundancyValidator = [
     if (!await doesVideoExist(req.body.videoId, res, 'only-video')) return
 
     if (res.locals.onlyVideo.remote === false) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-        .json({ error: 'Cannot create a redundancy on a local video' })
+      return res.fail({ message: 'Cannot create a redundancy on a local video' })
     }
 
     if (res.locals.onlyVideo.isLive) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-        .json({ error: 'Cannot create a redundancy of a live video' })
+      return res.fail({ message: 'Cannot create a redundancy of a live video' })
     }
 
     const alreadyExists = await VideoRedundancyModel.isLocalByVideoUUIDExists(res.locals.onlyVideo.uuid)
     if (alreadyExists) {
-      return res.status(HttpStatusCode.CONFLICT_409)
-                .json({ error: 'This video is already duplicated by your instance.' })
+      return res.fail({
+        status: HttpStatusCode.CONFLICT_409,
+        message: 'This video is already duplicated by your instance.'
+      })
     }
 
     return next()
@@ -160,9 +178,10 @@ const removeVideoRedundancyValidator = [
 
     const redundancy = await VideoRedundancyModel.loadByIdWithVideo(parseInt(req.params.redundancyId, 10))
     if (!redundancy) {
-      return res.status(HttpStatusCode.NOT_FOUND_404)
-                .json({ error: 'Video redundancy not found' })
-                .end()
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Video redundancy not found'
+      })
     }
 
     res.locals.videoRedundancy = redundancy
diff --git a/server/middlewares/validators/server.ts b/server/middlewares/validators/server.ts
index fe6704716..2b34c4a76 100644
--- a/server/middlewares/validators/server.ts
+++ b/server/middlewares/validators/server.ts
@@ -19,9 +19,10 @@ const serverGetValidator = [
 
     const server = await ServerModel.loadByHost(req.body.host)
     if (!server) {
-      return res.status(HttpStatusCode.NOT_FOUND_404)
-                .send({ error: 'Server host not found.' })
-                .end()
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Server host not found.'
+      })
     }
 
     res.locals.server = server
@@ -44,26 +45,26 @@ const contactAdministratorValidator = [
     if (areValidationErrors(req, res)) return
 
     if (CONFIG.CONTACT_FORM.ENABLED === false) {
-      return res
-        .status(HttpStatusCode.CONFLICT_409)
-        .send({ error: 'Contact form is not enabled on this instance.' })
-        .end()
+      return res.fail({
+        status: HttpStatusCode.CONFLICT_409,
+        message: 'Contact form is not enabled on this instance.'
+      })
     }
 
     if (isEmailEnabled() === false) {
-      return res
-        .status(HttpStatusCode.CONFLICT_409)
-        .send({ error: 'Emailer is not enabled on this instance.' })
-        .end()
+      return res.fail({
+        status: HttpStatusCode.CONFLICT_409,
+        message: 'Emailer is not enabled on this instance.'
+      })
     }
 
     if (await Redis.Instance.doesContactFormIpExist(req.ip)) {
       logger.info('Refusing a contact form by %s: already sent one recently.', req.ip)
 
-      return res
-        .status(HttpStatusCode.FORBIDDEN_403)
-        .send({ error: 'You already sent a contact form recently.' })
-        .end()
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'You already sent a contact form recently.'
+      })
     }
 
     return next()
diff --git a/server/middlewares/validators/themes.ts b/server/middlewares/validators/themes.ts
index a726a567b..91ec0d7ac 100644
--- a/server/middlewares/validators/themes.ts
+++ b/server/middlewares/validators/themes.ts
@@ -20,11 +20,17 @@ const serveThemeCSSValidator = [
     const theme = PluginManager.Instance.getRegisteredThemeByShortName(req.params.themeName)
 
     if (!theme || theme.version !== req.params.themeVersion) {
-      return res.sendStatus(HttpStatusCode.NOT_FOUND_404)
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'No theme named ' + req.params.themeName + ' was found with version ' + req.params.themeVersion
+      })
     }
 
     if (theme.css.includes(req.params.staticEndpoint) === false) {
-      return res.sendStatus(HttpStatusCode.NOT_FOUND_404)
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'No static endpoint was found for this theme'
+      })
     }
 
     res.locals.registeredPlugin = theme
diff --git a/server/middlewares/validators/user-subscriptions.ts b/server/middlewares/validators/user-subscriptions.ts
index 1823892b6..5f928b05b 100644
--- a/server/middlewares/validators/user-subscriptions.ts
+++ b/server/middlewares/validators/user-subscriptions.ts
@@ -61,11 +61,10 @@ const userSubscriptionGetValidator = [
     const subscription = await ActorFollowModel.loadByActorAndTargetNameAndHostForAPI(user.Account.Actor.id, name, host)
 
     if (!subscription || !subscription.ActorFollowing.VideoChannel) {
-      return res
-        .status(HttpStatusCode.NOT_FOUND_404)
-        .json({
-          error: `Subscription ${req.params.uri} not found.`
-        })
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: `Subscription ${req.params.uri} not found.`
+      })
     }
 
     res.locals.subscription = subscription
diff --git a/server/middlewares/validators/users.ts b/server/middlewares/validators/users.ts
index 548d5df4d..0eb9172c4 100644
--- a/server/middlewares/validators/users.ts
+++ b/server/middlewares/validators/users.ts
@@ -73,23 +73,23 @@ const usersAddValidator = [
 
     const authUser = res.locals.oauth.token.User
     if (authUser.role !== UserRole.ADMINISTRATOR && req.body.role !== UserRole.USER) {
-      return res
-        .status(HttpStatusCode.FORBIDDEN_403)
-        .json({ error: 'You can only create users (and not administrators or moderators)' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'You can only create users (and not administrators or moderators)'
+      })
     }
 
     if (req.body.channelName) {
       if (req.body.channelName === req.body.username) {
-        return res
-          .status(HttpStatusCode.BAD_REQUEST_400)
-          .json({ error: 'Channel name cannot be the same as user username.' })
+        return res.fail({ message: 'Channel name cannot be the same as user username.' })
       }
 
       const existing = await ActorModel.loadLocalByName(req.body.channelName)
       if (existing) {
-        return res
-          .status(HttpStatusCode.CONFLICT_409)
-          .json({ error: `Channel with name ${req.body.channelName} already exists.` })
+        return res.fail({
+          status: HttpStatusCode.CONFLICT_409,
+          message: `Channel with name ${req.body.channelName} already exists.`
+        })
       }
     }
 
@@ -121,20 +121,19 @@ const usersRegisterValidator = [
     const body: UserRegister = req.body
     if (body.channel) {
       if (!body.channel.name || !body.channel.displayName) {
-        return res
-          .status(HttpStatusCode.BAD_REQUEST_400)
-          .json({ error: 'Channel is optional but if you specify it, channel.name and channel.displayName are required.' })
+        return res.fail({ message: 'Channel is optional but if you specify it, channel.name and channel.displayName are required.' })
       }
 
       if (body.channel.name === body.username) {
-        return res.status(HttpStatusCode.BAD_REQUEST_400)
-                  .json({ error: 'Channel name cannot be the same as user username.' })
+        return res.fail({ message: 'Channel name cannot be the same as user username.' })
       }
 
       const existing = await ActorModel.loadLocalByName(body.channel.name)
       if (existing) {
-        return res.status(HttpStatusCode.CONFLICT_409)
-                  .json({ error: `Channel with name ${body.channel.name} already exists.` })
+        return res.fail({
+          status: HttpStatusCode.CONFLICT_409,
+          message: `Channel with name ${body.channel.name} already exists.`
+        })
       }
     }
 
@@ -153,8 +152,7 @@ const usersRemoveValidator = [
 
     const user = res.locals.user
     if (user.username === 'root') {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({ error: 'Cannot remove the root user' })
+      return res.fail({ message: 'Cannot remove the root user' })
     }
 
     return next()
@@ -173,8 +171,7 @@ const usersBlockingValidator = [
 
     const user = res.locals.user
     if (user.username === 'root') {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({ error: 'Cannot block the root user' })
+      return res.fail({ message: 'Cannot block the root user' })
     }
 
     return next()
@@ -185,9 +182,7 @@ const deleteMeValidator = [
   (req: express.Request, res: express.Response, next: express.NextFunction) => {
     const user = res.locals.oauth.token.User
     if (user.username === 'root') {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({ error: 'You cannot delete your root account.' })
-                .end()
+      return res.fail({ message: 'You cannot delete your root account.' })
     }
 
     return next()
@@ -217,8 +212,7 @@ const usersUpdateValidator = [
 
     const user = res.locals.user
     if (user.username === 'root' && req.body.role !== undefined && user.role !== req.body.role) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({ error: 'Cannot change root role.' })
+      return res.fail({ message: 'Cannot change root role.' })
     }
 
     return next()
@@ -273,18 +267,18 @@ const usersUpdateMeValidator = [
 
     if (req.body.password || req.body.email) {
       if (user.pluginAuth !== null) {
-        return res.status(HttpStatusCode.BAD_REQUEST_400)
-                  .json({ error: 'You cannot update your email or password that is associated with an external auth system.' })
+        return res.fail({ message: 'You cannot update your email or password that is associated with an external auth system.' })
       }
 
       if (!req.body.currentPassword) {
-        return res.status(HttpStatusCode.BAD_REQUEST_400)
-                  .json({ error: 'currentPassword parameter is missing.' })
+        return res.fail({ message: 'currentPassword parameter is missing.' })
       }
 
       if (await user.isPasswordMatch(req.body.currentPassword) !== true) {
-        return res.status(HttpStatusCode.UNAUTHORIZED_401)
-                  .json({ error: 'currentPassword is invalid.' })
+        return res.fail({
+          status: HttpStatusCode.UNAUTHORIZED_401,
+          message: 'currentPassword is invalid.'
+        })
       }
     }
 
@@ -335,8 +329,10 @@ const ensureUserRegistrationAllowed = [
     )
 
     if (allowedResult.allowed === false) {
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-                .json({ error: allowedResult.errorMessage || 'User registration is not enabled or user limit is reached.' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: allowedResult.errorMessage || 'User registration is not enabled or user limit is reached.'
+      })
     }
 
     return next()
@@ -348,8 +344,10 @@ const ensureUserRegistrationAllowedForIP = [
     const allowed = isSignupAllowedForCurrentIP(req.ip)
 
     if (allowed === false) {
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-                .json({ error: 'You are not on a network authorized for registration.' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'You are not on a network authorized for registration.'
+      })
     }
 
     return next()
@@ -390,9 +388,10 @@ const usersResetPasswordValidator = [
     const redisVerificationString = await Redis.Instance.getResetPasswordLink(user.id)
 
     if (redisVerificationString !== req.body.verificationString) {
-      return res
-        .status(HttpStatusCode.FORBIDDEN_403)
-        .json({ error: 'Invalid verification string.' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Invalid verification string.'
+      })
     }
 
     return next()
@@ -437,9 +436,10 @@ const usersVerifyEmailValidator = [
     const redisVerificationString = await Redis.Instance.getVerifyEmailLink(user.id)
 
     if (redisVerificationString !== req.body.verificationString) {
-      return res
-        .status(HttpStatusCode.FORBIDDEN_403)
-        .json({ error: 'Invalid verification string.' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Invalid verification string.'
+      })
     }
 
     return next()
@@ -455,8 +455,10 @@ const ensureAuthUserOwnsAccountValidator = [
     const user = res.locals.oauth.token.User
 
     if (res.locals.account.id !== user.Account.id) {
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-                .json({ error: 'Only owner can access ratings list.' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Only owner can access ratings list.'
+      })
     }
 
     return next()
@@ -471,8 +473,10 @@ const ensureCanManageUser = [
     if (authUser.role === UserRole.ADMINISTRATOR) return next()
     if (authUser.role === UserRole.MODERATOR && onUser.role === UserRole.USER) return next()
 
-    return res.status(HttpStatusCode.FORBIDDEN_403)
-      .json({ error: 'A moderator can only manager users.' })
+    return res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: 'A moderator can only manager users.'
+    })
   }
 ]
 
@@ -515,15 +519,19 @@ async function checkUserNameOrEmailDoesNotAlreadyExist (username: string, email:
   const user = await UserModel.loadByUsernameOrEmail(username, email)
 
   if (user) {
-    res.status(HttpStatusCode.CONFLICT_409)
-              .json({ error: 'User with this username or email already exists.' })
+    res.fail({
+      status: HttpStatusCode.CONFLICT_409,
+      message: 'User with this username or email already exists.'
+    })
     return false
   }
 
   const actor = await ActorModel.loadLocalByName(username)
   if (actor) {
-    res.status(HttpStatusCode.CONFLICT_409)
-       .json({ error: 'Another actor (account/channel) with this name on this instance already exists or has already existed.' })
+    res.fail({
+      status: HttpStatusCode.CONFLICT_409,
+      message: 'Another actor (account/channel) with this name on this instance already exists or has already existed.'
+    })
     return false
   }
 
@@ -535,14 +543,15 @@ async function checkUserExist (finder: () => Promise<MUserDefault>, res: express
 
   if (!user) {
     if (abortResponse === true) {
-      res.status(HttpStatusCode.NOT_FOUND_404)
-        .json({ error: 'User not found' })
+      res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'User not found'
+      })
     }
 
     return false
   }
 
   res.locals.user = user
-
   return true
 }
diff --git a/server/middlewares/validators/utils.ts b/server/middlewares/validators/utils.ts
index 4167f6d43..e291f1b17 100644
--- a/server/middlewares/validators/utils.ts
+++ b/server/middlewares/validators/utils.ts
@@ -1,15 +1,19 @@
 import * as express from 'express'
 import { query, validationResult } from 'express-validator'
 import { logger } from '../../helpers/logger'
-import { HttpStatusCode } from '../../../shared/core-utils/miscs/http-error-codes'
 
 function areValidationErrors (req: express.Request, res: express.Response) {
   const errors = validationResult(req)
 
   if (!errors.isEmpty()) {
     logger.warn('Incorrect request parameters', { path: req.originalUrl, err: errors.mapped() })
-    res.status(HttpStatusCode.BAD_REQUEST_400)
-       .json({ errors: errors.mapped() })
+    res.fail({
+      message: 'Incorrect request parameters: ' + Object.keys(errors.mapped()).join(', '),
+      instance: req.originalUrl,
+      data: {
+        'invalid-params': errors.mapped()
+      }
+    })
 
     return true
   }
diff --git a/server/middlewares/validators/videos/video-blacklist.ts b/server/middlewares/validators/videos/video-blacklist.ts
index 88c788a43..65132a09f 100644
--- a/server/middlewares/validators/videos/video-blacklist.ts
+++ b/server/middlewares/validators/videos/video-blacklist.ts
@@ -39,10 +39,10 @@ const videosBlacklistAddValidator = [
 
     const video = res.locals.videoAll
     if (req.body.unfederate === true && video.remote === true) {
-      return res
-        .status(HttpStatusCode.CONFLICT_409)
-        .send({ error: 'You cannot unfederate a remote video.' })
-        .end()
+      return res.fail({
+        status: HttpStatusCode.CONFLICT_409,
+        message: 'You cannot unfederate a remote video.'
+      })
     }
 
     return next()
diff --git a/server/middlewares/validators/videos/video-channels.ts b/server/middlewares/validators/videos/video-channels.ts
index e881f0d3e..331a51007 100644
--- a/server/middlewares/validators/videos/video-channels.ts
+++ b/server/middlewares/validators/videos/video-channels.ts
@@ -30,17 +30,16 @@ const videoChannelsAddValidator = [
 
     const actor = await ActorModel.loadLocalByName(req.body.name)
     if (actor) {
-      res.status(HttpStatusCode.CONFLICT_409)
-         .send({ error: 'Another actor (account/channel) with this name on this instance already exists or has already existed.' })
-         .end()
+      res.fail({
+        status: HttpStatusCode.CONFLICT_409,
+        message: 'Another actor (account/channel) with this name on this instance already exists or has already existed.'
+      })
       return false
     }
 
     const count = await VideoChannelModel.countByAccount(res.locals.oauth.token.User.Account.id)
     if (count >= VIDEO_CHANNELS.MAX_PER_USER) {
-      res.status(HttpStatusCode.BAD_REQUEST_400)
-        .send({ error: `You cannot create more than ${VIDEO_CHANNELS.MAX_PER_USER} channels` })
-        .end()
+      res.fail({ message: `You cannot create more than ${VIDEO_CHANNELS.MAX_PER_USER} channels` })
       return false
     }
 
@@ -71,13 +70,17 @@ const videoChannelsUpdateValidator = [
 
     // We need to make additional checks
     if (res.locals.videoChannel.Actor.isOwned() === false) {
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-        .json({ error: 'Cannot update video channel of another server' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Cannot update video channel of another server'
+      })
     }
 
     if (res.locals.videoChannel.Account.userId !== res.locals.oauth.token.User.id) {
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-        .json({ error: 'Cannot update video channel of another user' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Cannot update video channel of another user'
+      })
     }
 
     return next()
@@ -154,10 +157,10 @@ export {
 
 function checkUserCanDeleteVideoChannel (user: MUser, videoChannel: MChannelAccountDefault, res: express.Response) {
   if (videoChannel.Actor.isOwned() === false) {
-    res.status(HttpStatusCode.FORBIDDEN_403)
-              .json({ error: 'Cannot remove video channel of another server.' })
-              .end()
-
+    res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: 'Cannot remove video channel of another server.'
+    })
     return false
   }
 
@@ -165,10 +168,10 @@ function checkUserCanDeleteVideoChannel (user: MUser, videoChannel: MChannelAcco
   // The user can delete it if s/he is an admin
   // Or if s/he is the video channel's account
   if (user.hasRight(UserRight.REMOVE_ANY_VIDEO_CHANNEL) === false && videoChannel.Account.userId !== user.id) {
-    res.status(HttpStatusCode.FORBIDDEN_403)
-              .json({ error: 'Cannot remove video channel of another user' })
-              .end()
-
+    res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: 'Cannot remove video channel of another user'
+    })
     return false
   }
 
@@ -179,10 +182,10 @@ async function checkVideoChannelIsNotTheLastOne (res: express.Response) {
   const count = await VideoChannelModel.countByAccount(res.locals.oauth.token.User.Account.id)
 
   if (count <= 1) {
-    res.status(HttpStatusCode.CONFLICT_409)
-       .json({ error: 'Cannot remove the last channel of this user' })
-       .end()
-
+    res.fail({
+      status: HttpStatusCode.CONFLICT_409,
+      message: 'Cannot remove the last channel of this user'
+    })
     return false
   }
 
diff --git a/server/middlewares/validators/videos/video-comments.ts b/server/middlewares/validators/videos/video-comments.ts
index 1afacfed8..aac25a787 100644
--- a/server/middlewares/validators/videos/video-comments.ts
+++ b/server/middlewares/validators/videos/video-comments.ts
@@ -155,9 +155,10 @@ export {
 
 function isVideoCommentsEnabled (video: MVideo, res: express.Response) {
   if (video.commentsEnabled !== true) {
-    res.status(HttpStatusCode.CONFLICT_409)
-       .json({ error: 'Video comments are disabled for this video.' })
-
+    res.fail({
+      status: HttpStatusCode.CONFLICT_409,
+      message: 'Video comments are disabled for this video.'
+    })
     return false
   }
 
@@ -166,9 +167,10 @@ function isVideoCommentsEnabled (video: MVideo, res: express.Response) {
 
 function checkUserCanDeleteVideoComment (user: MUserAccountUrl, videoComment: MCommentOwnerVideoReply, res: express.Response) {
   if (videoComment.isDeleted()) {
-    res.status(HttpStatusCode.CONFLICT_409)
-       .json({ error: 'This comment is already deleted' })
-
+    res.fail({
+      status: HttpStatusCode.CONFLICT_409,
+      message: 'This comment is already deleted'
+    })
     return false
   }
 
@@ -179,9 +181,10 @@ function checkUserCanDeleteVideoComment (user: MUserAccountUrl, videoComment: MC
     videoComment.accountId !== userAccount.id && // Not the comment owner
     videoComment.Video.VideoChannel.accountId !== userAccount.id // Not the video owner
   ) {
-    res.status(HttpStatusCode.FORBIDDEN_403)
-      .json({ error: 'Cannot remove video comment of another user' })
-
+    res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: 'Cannot remove video comment of another user'
+    })
     return false
   }
 
@@ -215,9 +218,11 @@ async function isVideoCommentAccepted (req: express.Request, res: express.Respon
 
   if (!acceptedResult || acceptedResult.accepted !== true) {
     logger.info('Refused local comment.', { acceptedResult, acceptParameters })
-    res.status(HttpStatusCode.FORBIDDEN_403)
-       .json({ error: acceptedResult?.errorMessage || 'Refused local comment' })
 
+    res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: acceptedResult?.errorMessage || 'Refused local comment'
+    })
     return false
   }
 
diff --git a/server/middlewares/validators/videos/video-imports.ts b/server/middlewares/validators/videos/video-imports.ts
index a5e3ffbcd..55ff09124 100644
--- a/server/middlewares/validators/videos/video-imports.ts
+++ b/server/middlewares/validators/videos/video-imports.ts
@@ -47,14 +47,20 @@ const videoImportAddValidator = getCommonVideoEditAttributes().concat([
 
     if (CONFIG.IMPORT.VIDEOS.HTTP.ENABLED !== true && req.body.targetUrl) {
       cleanUpReqFiles(req)
-      return res.status(HttpStatusCode.CONFLICT_409)
-        .json({ error: 'HTTP import is not enabled on this instance.' })
+
+      return res.fail({
+        status: HttpStatusCode.CONFLICT_409,
+        message: 'HTTP import is not enabled on this instance.'
+      })
     }
 
     if (CONFIG.IMPORT.VIDEOS.TORRENT.ENABLED !== true && (req.body.magnetUri || torrentFile)) {
       cleanUpReqFiles(req)
-      return res.status(HttpStatusCode.CONFLICT_409)
-                .json({ error: 'Torrent/magnet URI import is not enabled on this instance.' })
+
+      return res.fail({
+        status: HttpStatusCode.CONFLICT_409,
+        message: 'Torrent/magnet URI import is not enabled on this instance.'
+      })
     }
 
     if (!await doesVideoChannelOfAccountExist(req.body.channelId, user, res)) return cleanUpReqFiles(req)
@@ -63,8 +69,7 @@ const videoImportAddValidator = getCommonVideoEditAttributes().concat([
     if (!req.body.targetUrl && !req.body.magnetUri && !torrentFile) {
       cleanUpReqFiles(req)
 
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-        .json({ error: 'Should have a magnetUri or a targetUrl or a torrent file.' })
+      return res.fail({ message: 'Should have a magnetUri or a targetUrl or a torrent file.' })
     }
 
     if (!await isImportAccepted(req, res)) return cleanUpReqFiles(req)
@@ -100,9 +105,11 @@ async function isImportAccepted (req: express.Request, res: express.Response) {
 
   if (!acceptedResult || acceptedResult.accepted !== true) {
     logger.info('Refused to import video.', { acceptedResult, acceptParameters })
-    res.status(HttpStatusCode.FORBIDDEN_403)
-       .json({ error: acceptedResult.errorMessage || 'Refused to import video' })
 
+    res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: acceptedResult.errorMessage || 'Refused to import video'
+    })
     return false
   }
 
diff --git a/server/middlewares/validators/videos/video-live.ts b/server/middlewares/validators/videos/video-live.ts
index ec4c7f32f..9544fa4f5 100644
--- a/server/middlewares/validators/videos/video-live.ts
+++ b/server/middlewares/validators/videos/video-live.ts
@@ -30,7 +30,12 @@ const videoLiveGetValidator = [
     if (!checkUserCanManageVideo(user, res.locals.videoAll, UserRight.GET_ANY_LIVE, res, false)) return
 
     const videoLive = await VideoLiveModel.loadByVideoId(res.locals.videoAll.id)
-    if (!videoLive) return res.sendStatus(HttpStatusCode.NOT_FOUND_404)
+    if (!videoLive) {
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Live video not found'
+      })
+    }
 
     res.locals.videoLive = videoLive
 
@@ -66,22 +71,25 @@ const videoLiveAddValidator = getCommonVideoEditAttributes().concat([
     if (CONFIG.LIVE.ENABLED !== true) {
       cleanUpReqFiles(req)
 
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-        .json({ error: 'Live is not enabled on this instance' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Live is not enabled on this instance'
+      })
     }
 
     if (CONFIG.LIVE.ALLOW_REPLAY !== true && req.body.saveReplay === true) {
       cleanUpReqFiles(req)
 
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-        .json({ error: 'Saving live replay is not allowed instance' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Saving live replay is not allowed instance'
+      })
     }
 
     if (req.body.permanentLive && req.body.saveReplay) {
       cleanUpReqFiles(req)
 
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-        .json({ error: 'Cannot set this live as permanent while saving its replay' })
+      return res.fail({ message: 'Cannot set this live as permanent while saving its replay' })
     }
 
     const user = res.locals.oauth.token.User
@@ -93,11 +101,11 @@ const videoLiveAddValidator = getCommonVideoEditAttributes().concat([
       if (totalInstanceLives >= CONFIG.LIVE.MAX_INSTANCE_LIVES) {
         cleanUpReqFiles(req)
 
-        return res.status(HttpStatusCode.FORBIDDEN_403)
-          .json({
-            code: ServerErrorCode.MAX_INSTANCE_LIVES_LIMIT_REACHED,
-            error: 'Cannot create this live because the max instance lives limit is reached.'
-          })
+        return res.fail({
+          status: HttpStatusCode.FORBIDDEN_403,
+          message: 'Cannot create this live because the max instance lives limit is reached.',
+          type: ServerErrorCode.MAX_INSTANCE_LIVES_LIMIT_REACHED.toString()
+        })
       }
     }
 
@@ -107,11 +115,11 @@ const videoLiveAddValidator = getCommonVideoEditAttributes().concat([
       if (totalUserLives >= CONFIG.LIVE.MAX_USER_LIVES) {
         cleanUpReqFiles(req)
 
-        return res.status(HttpStatusCode.FORBIDDEN_403)
-          .json({
-            code: ServerErrorCode.MAX_USER_LIVES_LIMIT_REACHED,
-            error: 'Cannot create this live because the max user lives limit is reached.'
-          })
+        return res.fail({
+          status: HttpStatusCode.FORBIDDEN_403,
+          type: ServerErrorCode.MAX_USER_LIVES_LIMIT_REACHED.toString(),
+          message: 'Cannot create this live because the max user lives limit is reached.'
+        })
       }
     }
 
@@ -133,18 +141,18 @@ const videoLiveUpdateValidator = [
     if (areValidationErrors(req, res)) return
 
     if (req.body.permanentLive && req.body.saveReplay) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-        .json({ error: 'Cannot set this live as permanent while saving its replay' })
+      return res.fail({ message: 'Cannot set this live as permanent while saving its replay' })
     }
 
     if (CONFIG.LIVE.ALLOW_REPLAY !== true && req.body.saveReplay === true) {
-      return res.status(HttpStatusCode.FORBIDDEN_403)
-        .json({ error: 'Saving live replay is not allowed instance' })
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Saving live replay is not allowed instance'
+      })
     }
 
     if (res.locals.videoAll.state !== VideoState.WAITING_FOR_LIVE) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-        .json({ error: 'Cannot update a live that has already started' })
+      return res.fail({ message: 'Cannot update a live that has already started' })
     }
 
     // Check the user can manage the live
@@ -180,9 +188,10 @@ async function isLiveVideoAccepted (req: express.Request, res: express.Response)
   if (!acceptedResult || acceptedResult.accepted !== true) {
     logger.info('Refused local live video.', { acceptedResult, acceptParameters })
 
-    res.status(HttpStatusCode.FORBIDDEN_403)
-       .json({ error: acceptedResult.errorMessage || 'Refused local live video' })
-
+    res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: acceptedResult.errorMessage || 'Refused local live video'
+    })
     return false
   }
 
diff --git a/server/middlewares/validators/videos/video-playlists.ts b/server/middlewares/validators/videos/video-playlists.ts
index c872d045e..90815dd3a 100644
--- a/server/middlewares/validators/videos/video-playlists.ts
+++ b/server/middlewares/validators/videos/video-playlists.ts
@@ -46,8 +46,8 @@ const videoPlaylistsAddValidator = getCommonPlaylistEditAttributes().concat([
 
     if (body.privacy === VideoPlaylistPrivacy.PUBLIC && !body.videoChannelId) {
       cleanUpReqFiles(req)
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({ error: 'Cannot set "public" a playlist that is not assigned to a channel.' })
+
+      return res.fail({ message: 'Cannot set "public" a playlist that is not assigned to a channel.' })
     }
 
     return next()
@@ -85,14 +85,14 @@ const videoPlaylistsUpdateValidator = getCommonPlaylistEditAttributes().concat([
       )
     ) {
       cleanUpReqFiles(req)
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({ error: 'Cannot set "public" a playlist that is not assigned to a channel.' })
+
+      return res.fail({ message: 'Cannot set "public" a playlist that is not assigned to a channel.' })
     }
 
     if (videoPlaylist.type === VideoPlaylistType.WATCH_LATER) {
       cleanUpReqFiles(req)
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({ error: 'Cannot update a watch later playlist.' })
+
+      return res.fail({ message: 'Cannot update a watch later playlist.' })
     }
 
     if (body.videoChannelId && !await doesVideoChannelIdExist(body.videoChannelId, res)) return cleanUpReqFiles(req)
@@ -114,8 +114,7 @@ const videoPlaylistsDeleteValidator = [
 
     const videoPlaylist = getPlaylist(res)
     if (videoPlaylist.type === VideoPlaylistType.WATCH_LATER) {
-      return res.status(HttpStatusCode.BAD_REQUEST_400)
-                .json({ error: 'Cannot delete a watch later playlist.' })
+      return res.fail({ message: 'Cannot delete a watch later playlist.' })
     }
 
     if (!checkUserCanManageVideoPlaylist(res.locals.oauth.token.User, videoPlaylist, UserRight.REMOVE_ANY_VIDEO_PLAYLIST, res)) {
@@ -144,7 +143,10 @@ const videoPlaylistsGetValidator = (fetchType: VideoPlaylistFetchType) => {
       if (videoPlaylist.privacy === VideoPlaylistPrivacy.UNLISTED) {
         if (isUUIDValid(req.params.playlistId)) return next()
 
-        return res.status(HttpStatusCode.NOT_FOUND_404).end()
+        return res.fail({
+          status: HttpStatusCode.NOT_FOUND_404,
+          message: 'Playlist not found'
+        })
       }
 
       if (videoPlaylist.privacy === VideoPlaylistPrivacy.PRIVATE) {
@@ -156,8 +158,10 @@ const videoPlaylistsGetValidator = (fetchType: VideoPlaylistFetchType) => {
           !user ||
           (videoPlaylist.OwnerAccount.id !== user.Account.id && !user.hasRight(UserRight.UPDATE_ANY_VIDEO_PLAYLIST))
         ) {
-          return res.status(HttpStatusCode.FORBIDDEN_403)
-                    .json({ error: 'Cannot get this private video playlist.' })
+          return res.fail({
+            status: HttpStatusCode.FORBIDDEN_403,
+            message: 'Cannot get this private video playlist.'
+          })
         }
 
         return next()
@@ -233,10 +237,10 @@ const videoPlaylistsUpdateOrRemoveVideoValidator = [
 
     const videoPlaylistElement = await VideoPlaylistElementModel.loadById(req.params.playlistElementId)
     if (!videoPlaylistElement) {
-      res.status(HttpStatusCode.NOT_FOUND_404)
-         .json({ error: 'Video playlist element not found' })
-         .end()
-
+      res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Video playlist element not found'
+      })
       return
     }
     res.locals.videoPlaylistElement = videoPlaylistElement
@@ -263,15 +267,18 @@ const videoPlaylistElementAPGetValidator = [
 
     const videoPlaylistElement = await VideoPlaylistElementModel.loadByPlaylistAndElementIdForAP(playlistId, playlistElementId)
     if (!videoPlaylistElement) {
-      res.status(HttpStatusCode.NOT_FOUND_404)
-         .json({ error: 'Video playlist element not found' })
-         .end()
-
+      res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Video playlist element not found'
+      })
       return
     }
 
     if (videoPlaylistElement.VideoPlaylist.privacy === VideoPlaylistPrivacy.PRIVATE) {
-      return res.status(HttpStatusCode.FORBIDDEN_403).end()
+      return res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Cannot get this private video playlist.'
+      })
     }
 
     res.locals.videoPlaylistElementAP = videoPlaylistElement
@@ -307,18 +314,12 @@ const videoPlaylistsReorderVideosValidator = [
     const reorderLength: number = req.body.reorderLength
 
     if (startPosition >= nextPosition || insertAfterPosition >= nextPosition) {
-      res.status(HttpStatusCode.BAD_REQUEST_400)
-         .json({ error: `Start position or insert after position exceed the playlist limits (max: ${nextPosition - 1})` })
-         .end()
-
+      res.fail({ message: `Start position or insert after position exceed the playlist limits (max: ${nextPosition - 1})` })
       return
     }
 
     if (reorderLength && reorderLength + startPosition > nextPosition) {
-      res.status(HttpStatusCode.BAD_REQUEST_400)
-         .json({ error: `Reorder length with this start position exceeds the playlist limits (max: ${nextPosition - startPosition})` })
-         .end()
-
+      res.fail({ message: `Reorder length with this start position exceeds the playlist limits (max: ${nextPosition - startPosition})` })
       return
     }
 
@@ -401,10 +402,10 @@ function getCommonPlaylistEditAttributes () {
 
 function checkUserCanManageVideoPlaylist (user: MUserAccountId, videoPlaylist: MVideoPlaylist, right: UserRight, res: express.Response) {
   if (videoPlaylist.isOwned() === false) {
-    res.status(HttpStatusCode.FORBIDDEN_403)
-       .json({ error: 'Cannot manage video playlist of another server.' })
-       .end()
-
+    res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: 'Cannot manage video playlist of another server.'
+    })
     return false
   }
 
@@ -412,10 +413,10 @@ function checkUserCanManageVideoPlaylist (user: MUserAccountId, videoPlaylist: M
   // The user can delete it if s/he is an admin
   // Or if s/he is the video playlist's owner
   if (user.hasRight(right) === false && videoPlaylist.ownerAccountId !== user.Account.id) {
-    res.status(HttpStatusCode.FORBIDDEN_403)
-       .json({ error: 'Cannot manage video playlist of another user' })
-       .end()
-
+    res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: 'Cannot manage video playlist of another user'
+    })
     return false
   }
 
diff --git a/server/middlewares/validators/videos/video-rates.ts b/server/middlewares/validators/videos/video-rates.ts
index 01bdef25f..5c4176f54 100644
--- a/server/middlewares/validators/videos/video-rates.ts
+++ b/server/middlewares/validators/videos/video-rates.ts
@@ -37,8 +37,10 @@ const getAccountVideoRateValidatorFactory = function (rateType: VideoRateType) {
 
       const rate = await AccountVideoRateModel.loadLocalAndPopulateVideo(rateType, req.params.name, +req.params.videoId)
       if (!rate) {
-        return res.status(HttpStatusCode.NOT_FOUND_404)
-                  .json({ error: 'Video rate not found' })
+        return res.fail({
+          status: HttpStatusCode.NOT_FOUND_404,
+          message: 'Video rate not found'
+        })
       }
 
       res.locals.accountVideoRate = rate
diff --git a/server/middlewares/validators/videos/video-watch.ts b/server/middlewares/validators/videos/video-watch.ts
index 29ce0dab6..00c739d31 100644
--- a/server/middlewares/validators/videos/video-watch.ts
+++ b/server/middlewares/validators/videos/video-watch.ts
@@ -21,7 +21,10 @@ const videoWatchingValidator = [
     const user = res.locals.oauth.token.User
     if (user.videosHistoryEnabled === false) {
       logger.warn('Cannot set videos to watch by user %d: videos history is disabled.', user.id)
-      return res.status(HttpStatusCode.CONFLICT_409).end()
+      return res.fail({
+        status: HttpStatusCode.CONFLICT_409,
+        message: 'Video history is disabled'
+      })
     }
 
     return next()
diff --git a/server/middlewares/validators/videos/videos.ts b/server/middlewares/validators/videos/videos.ts
index 8864be269..dfd472400 100644
--- a/server/middlewares/validators/videos/videos.ts
+++ b/server/middlewares/validators/videos/videos.ts
@@ -73,6 +73,7 @@ const videosAddLegacyValidator = getCommonVideoEditAttributes().concat([
     .custom(isIdValid).withMessage('Should have correct video channel id'),
 
   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    res.docs = "https://docs.joinpeertube.org/api-rest-reference.html#operation/uploadLegacy"
     logger.debug('Checking videosAdd parameters', { parameters: req.body, files: req.files })
 
     if (areValidationErrors(req, res)) return cleanUpReqFiles(req)
@@ -88,9 +89,11 @@ const videosAddLegacyValidator = getCommonVideoEditAttributes().concat([
       if (!videoFile.duration) await addDurationToVideo(videoFile)
     } catch (err) {
       logger.error('Invalid input file in videosAddLegacyValidator.', { err })
-      res.status(HttpStatusCode.UNPROCESSABLE_ENTITY_422)
-         .json({ error: 'Video file unreadable.' })
 
+      res.fail({
+        status: HttpStatusCode.UNPROCESSABLE_ENTITY_422,
+        message: 'Video file unreadable.'
+      })
       return cleanUpReqFiles(req)
     }
 
@@ -105,6 +108,7 @@ const videosAddLegacyValidator = getCommonVideoEditAttributes().concat([
  */
 const videosAddResumableValidator = [
   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    res.docs = "https://docs.joinpeertube.org/api-rest-reference.html#operation/uploadResumable"
     const user = res.locals.oauth.token.User
 
     const body: express.CustomUploadXFile<express.UploadXFileMetadata> = req.body
@@ -118,9 +122,11 @@ const videosAddResumableValidator = [
       if (!file.duration) await addDurationToVideo(file)
     } catch (err) {
       logger.error('Invalid input file in videosAddResumableValidator.', { err })
-      res.status(HttpStatusCode.UNPROCESSABLE_ENTITY_422)
-         .json({ error: 'Video file unreadable.' })
 
+      res.fail({
+        status: HttpStatusCode.UNPROCESSABLE_ENTITY_422,
+        message: 'Video file unreadable.'
+      })
       return cleanup()
     }
 
@@ -164,6 +170,7 @@ const videosAddResumableInitValidator = getCommonVideoEditAttributes().concat([
     .withMessage('Should specify the file mimetype'),
 
   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    res.docs = "https://docs.joinpeertube.org/api-rest-reference.html#operation/uploadResumableInit"
     const videoFileMetadata = {
       mimetype: req.headers['x-upload-content-type'] as string,
       size: +req.headers['x-upload-content-length'],
@@ -207,6 +214,7 @@ const videosUpdateValidator = getCommonVideoEditAttributes().concat([
     .custom(isIdValid).withMessage('Should have correct video channel id'),
 
   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    res.docs = 'https://docs.joinpeertube.org/api-rest-reference.html#operation/putVideo'
     logger.debug('Checking videosUpdate parameters', { parameters: req.body })
 
     if (areValidationErrors(req, res)) return cleanUpReqFiles(req)
@@ -242,12 +250,14 @@ async function checkVideoFollowConstraints (req: express.Request, res: express.R
   const serverActor = await getServerActor()
   if (await VideoModel.checkVideoHasInstanceFollow(video.id, serverActor.id) === true) return next()
 
-  return res.status(HttpStatusCode.FORBIDDEN_403)
-            .json({
-              errorCode: ServerErrorCode.DOES_NOT_RESPECT_FOLLOW_CONSTRAINTS,
-              error: 'Cannot get this video regarding follow constraints.',
-              originUrl: video.url
-            })
+  return res.fail({
+    status: HttpStatusCode.FORBIDDEN_403,
+    message: 'Cannot get this video regarding follow constraints.',
+    type: ServerErrorCode.DOES_NOT_RESPECT_FOLLOW_CONSTRAINTS.toString(),
+    data: {
+      originUrl: video.url
+    }
+  })
 }
 
 const videosCustomGetValidator = (
@@ -258,6 +268,7 @@ const videosCustomGetValidator = (
     param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
 
     async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+      res.docs = 'https://docs.joinpeertube.org/api-rest-reference.html#operation/getVideo'
       logger.debug('Checking videosGet parameters', { parameters: req.params })
 
       if (areValidationErrors(req, res)) return
@@ -276,8 +287,10 @@ const videosCustomGetValidator = (
 
         // Only the owner or a user that have blacklist rights can see the video
         if (!user || !user.canGetVideo(video)) {
-          return res.status(HttpStatusCode.FORBIDDEN_403)
-                    .json({ error: 'Cannot get this private/internal or blacklisted video.' })
+          return res.fail({
+            status: HttpStatusCode.FORBIDDEN_403,
+            message: 'Cannot get this private/internal or blacklisted video.'
+          })
         }
 
         return next()
@@ -291,7 +304,10 @@ const videosCustomGetValidator = (
         if (isUUIDValid(req.params.id)) return next()
 
         // Don't leak this unlisted video
-        return res.status(HttpStatusCode.NOT_FOUND_404).end()
+        return res.fail({
+          status: HttpStatusCode.NOT_FOUND_404,
+          message: 'Video not found'
+        })
       }
     }
   ]
@@ -318,6 +334,7 @@ const videosRemoveValidator = [
   param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
 
   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+    res.docs = "https://docs.joinpeertube.org/api-rest-reference.html#operation/delVideo"
     logger.debug('Checking videosRemove parameters', { parameters: req.params })
 
     if (areValidationErrors(req, res)) return
@@ -344,13 +361,11 @@ const videosChangeOwnershipValidator = [
 
     const nextOwner = await AccountModel.loadLocalByName(req.body.username)
     if (!nextOwner) {
-      res.status(HttpStatusCode.BAD_REQUEST_400)
-        .json({ error: 'Changing video ownership to a remote account is not supported yet' })
-
+      res.fail({ message: 'Changing video ownership to a remote account is not supported yet' })
       return
     }
-    res.locals.nextOwner = nextOwner
 
+    res.locals.nextOwner = nextOwner
     return next()
   }
 ]
@@ -370,8 +385,10 @@ const videosTerminateChangeOwnershipValidator = [
     const videoChangeOwnership = res.locals.videoChangeOwnership
 
     if (videoChangeOwnership.status !== VideoChangeOwnershipStatus.WAITING) {
-      res.status(HttpStatusCode.FORBIDDEN_403)
-         .json({ error: 'Ownership already accepted or refused' })
+      res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Ownership already accepted or refused'
+      })
       return
     }
 
@@ -388,9 +405,10 @@ const videosAcceptChangeOwnershipValidator = [
     const videoChangeOwnership = res.locals.videoChangeOwnership
     const isAble = await isAbleToUploadVideo(user.id, videoChangeOwnership.Video.getMaxQualityFile().size)
     if (isAble === false) {
-      res.status(HttpStatusCode.PAYLOAD_TOO_LARGE_413)
-        .json({ error: 'The user video quota is exceeded with this video.' })
-
+      res.fail({
+        status: HttpStatusCode.PAYLOAD_TOO_LARGE_413,
+        message: 'The user video quota is exceeded with this video.'
+      })
       return
     }
 
@@ -538,9 +556,10 @@ const commonVideosFiltersValidator = [
       (req.query.filter === 'all-local' || req.query.filter === 'all') &&
       (!user || user.hasRight(UserRight.SEE_ALL_VIDEOS) === false)
     ) {
-      res.status(HttpStatusCode.UNAUTHORIZED_401)
-         .json({ error: 'You are not allowed to see all local videos.' })
-
+      res.fail({
+        status: HttpStatusCode.UNAUTHORIZED_401,
+        message: 'You are not allowed to see all local videos.'
+      })
       return
     }
 
@@ -581,9 +600,7 @@ function areErrorsInScheduleUpdate (req: express.Request, res: express.Response)
     if (!req.body.scheduleUpdate.updateAt) {
       logger.warn('Invalid parameters: scheduleUpdate.updateAt is mandatory.')
 
-      res.status(HttpStatusCode.BAD_REQUEST_400)
-         .json({ error: 'Schedule update at is mandatory.' })
-
+      res.fail({ message: 'Schedule update at is mandatory.' })
       return true
     }
   }
@@ -605,26 +622,27 @@ async function commonVideoChecksPass (parameters: {
   if (!await doesVideoChannelOfAccountExist(req.body.channelId, user, res)) return false
 
   if (!isVideoFileMimeTypeValid(files)) {
-    res.status(HttpStatusCode.UNSUPPORTED_MEDIA_TYPE_415)
-        .json({
-          error: 'This file is not supported. Please, make sure it is of the following type: ' +
-                CONSTRAINTS_FIELDS.VIDEOS.EXTNAME.join(', ')
-        })
-
+    res.fail({
+      status: HttpStatusCode.UNSUPPORTED_MEDIA_TYPE_415,
+      message: 'This file is not supported. Please, make sure it is of the following type: ' +
+               CONSTRAINTS_FIELDS.VIDEOS.EXTNAME.join(', ')
+    })
     return false
   }
 
   if (!isVideoFileSizeValid(videoFileSize.toString())) {
-    res.status(HttpStatusCode.PAYLOAD_TOO_LARGE_413)
-        .json({ error: 'This file is too large. It exceeds the maximum file size authorized.' })
-
+    res.fail({
+      status: HttpStatusCode.PAYLOAD_TOO_LARGE_413,
+      message: 'This file is too large. It exceeds the maximum file size authorized.'
+    })
     return false
   }
 
   if (await isAbleToUploadVideo(user.id, videoFileSize) === false) {
-    res.status(HttpStatusCode.PAYLOAD_TOO_LARGE_413)
-        .json({ error: 'The user video quota is exceeded with this video.' })
-
+    res.fail({
+      status: HttpStatusCode.PAYLOAD_TOO_LARGE_413,
+      message: 'The user video quota is exceeded with this video.'
+    })
     return false
   }
 
@@ -650,9 +668,10 @@ export async function isVideoAccepted (
 
   if (!acceptedResult || acceptedResult.accepted !== true) {
     logger.info('Refused local video.', { acceptedResult, acceptParameters })
-    res.status(HttpStatusCode.FORBIDDEN_403)
-       .json({ error: acceptedResult.errorMessage || 'Refused local video' })
-
+    res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: acceptedResult.errorMessage || 'Refused local video'
+    })
     return false
   }
 
diff --git a/server/middlewares/validators/webfinger.ts b/server/middlewares/validators/webfinger.ts
index c2dfccc96..097a5ece1 100644
--- a/server/middlewares/validators/webfinger.ts
+++ b/server/middlewares/validators/webfinger.ts
@@ -21,9 +21,10 @@ const webfingerValidator = [
 
     const actor = await ActorModel.loadLocalUrlByName(name)
     if (!actor) {
-      return res.status(HttpStatusCode.NOT_FOUND_404)
-                .send({ error: 'Actor not found' })
-                .end()
+      return res.fail({
+        status: HttpStatusCode.NOT_FOUND_404,
+        message: 'Actor not found'
+      })
     }
 
     res.locals.actorUrl = actor