diff --git a/client/src/app/shared/video/infinite-scroller.directive.ts b/client/src/app/shared/video/infinite-scroller.directive.ts
index 5f8a1dd6e..b1e88882c 100644
--- a/client/src/app/shared/video/infinite-scroller.directive.ts
+++ b/client/src/app/shared/video/infinite-scroller.directive.ts
@@ -39,7 +39,7 @@ export class InfiniteScrollerDirective implements OnInit, OnDestroy {
 
     const scrollObservable = fromEvent(this.container || window, 'scroll')
       .pipe(
-        startWith(null),
+        startWith(null as string), // FIXME: typings
         throttleTime(200, undefined, throttleOptions),
         map(() => this.getScrollInfo()),
         distinctUntilChanged((o1, o2) => o1.current === o2.current),
diff --git a/client/src/app/shared/video/video-miniature.component.html b/client/src/app/shared/video/video-miniature.component.html
index 7af0f1113..51ca1393d 100644
--- a/client/src/app/shared/video/video-miniature.component.html
+++ b/client/src/app/shared/video/video-miniature.component.html
@@ -31,7 +31,7 @@
 
       <div class="video-info-privacy">
         <ng-container *ngIf="displayOptions.privacyText">{{ video.privacy.label }}</ng-container>
-        <ng-container *ngIf="displayOptions.privacyText && displayOptions.state"> - </ng-container>
+        <ng-container *ngIf="displayOptions.privacyText && getStateLabel(video)"> - </ng-container>
         <ng-container *ngIf="displayOptions.state">{{ getStateLabel(video) }}</ng-container>
       </div>
 
diff --git a/client/src/app/videos/+video-watch/video-watch.component.ts b/client/src/app/videos/+video-watch/video-watch.component.ts
index 027c2b026..0d499d47f 100644
--- a/client/src/app/videos/+video-watch/video-watch.component.ts
+++ b/client/src/app/videos/+video-watch/video-watch.component.ts
@@ -255,10 +255,10 @@ export class VideoWatchComponent implements OnInit, OnDestroy {
     )
 
     // Video did change
-    forkJoin(
+    forkJoin([
       videoObs,
       this.videoCaptionService.listCaptions(videoId)
-    )
+    ])
       .pipe(
         // If 401, the video is private or blacklisted so redirect to 404
         catchError(err => this.restExtractor.redirectTo404IfNotFound(err, [ 400, 401, 403, 404 ]))
diff --git a/server/helpers/custom-validators/accounts.ts b/server/helpers/custom-validators/accounts.ts
index be196d2a4..f676669ea 100644
--- a/server/helpers/custom-validators/accounts.ts
+++ b/server/helpers/custom-validators/accounts.ts
@@ -1,4 +1,3 @@
-import 'express-validator'
 import { isUserDescriptionValid, isUserUsernameValid } from './users'
 import { exists } from './misc'
 
diff --git a/server/helpers/custom-validators/misc.ts b/server/helpers/custom-validators/misc.ts
index 3ef38fce1..1b7e00431 100644
--- a/server/helpers/custom-validators/misc.ts
+++ b/server/helpers/custom-validators/misc.ts
@@ -1,6 +1,7 @@
 import 'multer'
 import * as validator from 'validator'
 import { sep } from 'path'
+import toBoolean = require('validator/lib/toBoolean')
 
 function exists (value: any) {
   return value !== undefined && value !== null
@@ -46,9 +47,21 @@ function isBooleanValid (value: any) {
 }
 
 function toIntOrNull (value: string) {
-  if (value === 'null') return null
+  const v = toValueOrNull(value)
 
-  return validator.toInt(value)
+  if (v === null || v === undefined) return v
+  if (typeof v === 'number') return v
+
+  return validator.toInt(v)
+}
+
+function toBooleanOrNull (value: any) {
+  const v = toValueOrNull(value)
+
+  if (v === null || v === undefined) return v
+  if (typeof v === 'boolean') return v
+
+  return toBoolean(v)
 }
 
 function toValueOrNull (value: string) {
@@ -110,6 +123,7 @@ export {
   isIdOrUUIDValid,
   isDateValid,
   toValueOrNull,
+  toBooleanOrNull,
   isBooleanValid,
   toIntOrNull,
   toArray,
diff --git a/server/helpers/custom-validators/search.ts b/server/helpers/custom-validators/search.ts
index 15b389a58..ee732b15a 100644
--- a/server/helpers/custom-validators/search.ts
+++ b/server/helpers/custom-validators/search.ts
@@ -1,6 +1,4 @@
 import * as validator from 'validator'
-import 'express-validator'
-
 import { isArray } from './misc'
 
 function isNumberArray (value: any) {
diff --git a/server/helpers/custom-validators/servers.ts b/server/helpers/custom-validators/servers.ts
index 5c8bf0d2d..7ced36fd3 100644
--- a/server/helpers/custom-validators/servers.ts
+++ b/server/helpers/custom-validators/servers.ts
@@ -1,7 +1,5 @@
 import * as validator from 'validator'
-import 'express-validator'
-
-import { isArray, exists } from './misc'
+import { exists, isArray } from './misc'
 import { isTestInstance } from '../core-utils'
 import { CONSTRAINTS_FIELDS } from '../../initializers/constants'
 
diff --git a/server/helpers/custom-validators/users.ts b/server/helpers/custom-validators/users.ts
index 738d5cbbf..c56ae14ef 100644
--- a/server/helpers/custom-validators/users.ts
+++ b/server/helpers/custom-validators/users.ts
@@ -1,4 +1,3 @@
-import 'express-validator'
 import * as validator from 'validator'
 import { UserRole } from '../../../shared'
 import { CONSTRAINTS_FIELDS, NSFW_POLICY_TYPES } from '../../initializers/constants'
diff --git a/server/helpers/custom-validators/video-channels.ts b/server/helpers/custom-validators/video-channels.ts
index f55f0c8ef..6c52dc093 100644
--- a/server/helpers/custom-validators/video-channels.ts
+++ b/server/helpers/custom-validators/video-channels.ts
@@ -1,5 +1,3 @@
-import 'express-validator'
-import 'multer'
 import * as validator from 'validator'
 import { CONSTRAINTS_FIELDS } from '../../initializers/constants'
 import { exists } from './misc'
diff --git a/server/helpers/custom-validators/video-comments.ts b/server/helpers/custom-validators/video-comments.ts
index 0707e2af2..8a7cd7105 100644
--- a/server/helpers/custom-validators/video-comments.ts
+++ b/server/helpers/custom-validators/video-comments.ts
@@ -1,4 +1,3 @@
-import 'express-validator'
 import 'multer'
 import * as validator from 'validator'
 import { CONSTRAINTS_FIELDS } from '../../initializers/constants'
diff --git a/server/helpers/custom-validators/video-imports.ts b/server/helpers/custom-validators/video-imports.ts
index f4235e2fa..8820c4c0a 100644
--- a/server/helpers/custom-validators/video-imports.ts
+++ b/server/helpers/custom-validators/video-imports.ts
@@ -1,4 +1,3 @@
-import 'express-validator'
 import 'multer'
 import * as validator from 'validator'
 import { CONSTRAINTS_FIELDS, MIMETYPES, VIDEO_IMPORT_STATES } from '../../initializers/constants'
diff --git a/server/helpers/custom-validators/videos.ts b/server/helpers/custom-validators/videos.ts
index 157e1a8e3..9ab1ef234 100644
--- a/server/helpers/custom-validators/videos.ts
+++ b/server/helpers/custom-validators/videos.ts
@@ -1,9 +1,6 @@
-import { Response } from 'express'
-import 'express-validator'
 import { values } from 'lodash'
-import 'multer'
 import * as validator from 'validator'
-import { UserRight, VideoFilter, VideoPrivacy, VideoRateType } from '../../../shared'
+import { VideoFilter, VideoPrivacy, VideoRateType } from '../../../shared'
 import {
   CONSTRAINTS_FIELDS,
   MIMETYPES,
@@ -13,9 +10,7 @@ import {
   VIDEO_RATE_TYPES,
   VIDEO_STATES
 } from '../../initializers/constants'
-import { VideoModel } from '../../models/video/video'
 import { exists, isArray, isDateValid, isFileValid } from './misc'
-import { UserModel } from '../../models/account/user'
 import * as magnetUtil from 'magnet-uri'
 
 const VIDEOS_CONSTRAINTS_FIELDS = CONSTRAINTS_FIELDS.VIDEOS
diff --git a/server/middlewares/oauth.ts b/server/middlewares/oauth.ts
index 2b4e300e4..77fb305dd 100644
--- a/server/middlewares/oauth.ts
+++ b/server/middlewares/oauth.ts
@@ -1,6 +1,5 @@
 import * as express from 'express'
 import * as OAuthServer from 'express-oauth-server'
-import 'express-validator'
 import { OAUTH_LIFETIME } from '../initializers/constants'
 import { logger } from '../helpers/logger'
 import { Socket } from 'socket.io'
diff --git a/server/middlewares/pagination.ts b/server/middlewares/pagination.ts
index 83304940f..043869303 100644
--- a/server/middlewares/pagination.ts
+++ b/server/middlewares/pagination.ts
@@ -1,6 +1,4 @@
-import 'express-validator'
 import * as express from 'express'
-
 import { PAGINATION } from '../initializers/constants'
 
 function setDefaultPagination (req: express.Request, res: express.Response, next: express.NextFunction) {
diff --git a/server/middlewares/servers.ts b/server/middlewares/servers.ts
index c52f4685b..9c0af443a 100644
--- a/server/middlewares/servers.ts
+++ b/server/middlewares/servers.ts
@@ -1,5 +1,4 @@
 import * as express from 'express'
-import 'express-validator'
 import { getHostWithPort } from '../helpers/express-utils'
 
 function setBodyHostsPort (req: express.Request, res: express.Response, next: express.NextFunction) {
diff --git a/server/middlewares/sort.ts b/server/middlewares/sort.ts
index 6507aa5b8..8c27e8237 100644
--- a/server/middlewares/sort.ts
+++ b/server/middlewares/sort.ts
@@ -1,5 +1,4 @@
 import * as express from 'express'
-import 'express-validator'
 import { SortType } from '../models/utils'
 
 function setDefaultSort (req: express.Request, res: express.Response, next: express.NextFunction) {
diff --git a/server/middlewares/user-right.ts b/server/middlewares/user-right.ts
index 498e3d677..4da7b9802 100644
--- a/server/middlewares/user-right.ts
+++ b/server/middlewares/user-right.ts
@@ -1,5 +1,4 @@
 import * as express from 'express'
-import 'express-validator'
 import { UserRight } from '../../shared'
 import { logger } from '../helpers/logger'
 
diff --git a/server/middlewares/validators/account.ts b/server/middlewares/validators/account.ts
index 67e4bf8cc..cbdcef2fd 100644
--- a/server/middlewares/validators/account.ts
+++ b/server/middlewares/validators/account.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { param } from 'express-validator/check'
+import { param } from 'express-validator'
 import { isAccountNameValid } from '../../helpers/custom-validators/accounts'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
diff --git a/server/middlewares/validators/activitypub/signature.ts b/server/middlewares/validators/activitypub/signature.ts
index be14e92ea..02b191480 100644
--- a/server/middlewares/validators/activitypub/signature.ts
+++ b/server/middlewares/validators/activitypub/signature.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { body } from 'express-validator/check'
+import { body } from 'express-validator'
 import {
   isSignatureCreatorValid, isSignatureTypeValid,
   isSignatureValueValid
diff --git a/server/middlewares/validators/avatar.ts b/server/middlewares/validators/avatar.ts
index bab3ed118..8623d07e8 100644
--- a/server/middlewares/validators/avatar.ts
+++ b/server/middlewares/validators/avatar.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { body } from 'express-validator/check'
+import { body } from 'express-validator'
 import { isAvatarFile } from '../../helpers/custom-validators/users'
 import { areValidationErrors } from './utils'
 import { CONSTRAINTS_FIELDS } from '../../initializers/constants'
diff --git a/server/middlewares/validators/blocklist.ts b/server/middlewares/validators/blocklist.ts
index 63d95e9e0..47a0b1a1c 100644
--- a/server/middlewares/validators/blocklist.ts
+++ b/server/middlewares/validators/blocklist.ts
@@ -1,4 +1,4 @@
-import { body, param } from 'express-validator/check'
+import { body, param } from 'express-validator'
 import * as express from 'express'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
diff --git a/server/middlewares/validators/config.ts b/server/middlewares/validators/config.ts
index 9c43da165..5059ed0f2 100644
--- a/server/middlewares/validators/config.ts
+++ b/server/middlewares/validators/config.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { body } from 'express-validator/check'
+import { body } from 'express-validator'
 import { isUserNSFWPolicyValid, isUserVideoQuotaDailyValid, isUserVideoQuotaValid } from '../../helpers/custom-validators/users'
 import { logger } from '../../helpers/logger'
 import { CustomConfig } from '../../../shared/models/server/custom-config.model'
diff --git a/server/middlewares/validators/feeds.ts b/server/middlewares/validators/feeds.ts
index fa130121f..1bef9891b 100644
--- a/server/middlewares/validators/feeds.ts
+++ b/server/middlewares/validators/feeds.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { param, query } from 'express-validator/check'
+import { param, query } from 'express-validator'
 import { isIdOrUUIDValid, isIdValid } from '../../helpers/custom-validators/misc'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
diff --git a/server/middlewares/validators/follows.ts b/server/middlewares/validators/follows.ts
index 2e5a02307..c3d772297 100644
--- a/server/middlewares/validators/follows.ts
+++ b/server/middlewares/validators/follows.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { body, param } from 'express-validator/check'
+import { body, param } from 'express-validator'
 import { isTestInstance } from '../../helpers/core-utils'
 import { isEachUniqueHostValid, isHostValid } from '../../helpers/custom-validators/servers'
 import { logger } from '../../helpers/logger'
diff --git a/server/middlewares/validators/jobs.ts b/server/middlewares/validators/jobs.ts
index 2f8b1738c..41a8d6899 100644
--- a/server/middlewares/validators/jobs.ts
+++ b/server/middlewares/validators/jobs.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { param } from 'express-validator/check'
+import { param } from 'express-validator'
 import { isValidJobState } from '../../helpers/custom-validators/jobs'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
diff --git a/server/middlewares/validators/logs.ts b/server/middlewares/validators/logs.ts
index 7380c6edd..07f3f552f 100644
--- a/server/middlewares/validators/logs.ts
+++ b/server/middlewares/validators/logs.ts
@@ -2,7 +2,7 @@ import * as express from 'express'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
 import { isDateValid } from '../../helpers/custom-validators/misc'
-import { query } from 'express-validator/check'
+import { query } from 'express-validator'
 import { isValidLogLevel } from '../../helpers/custom-validators/logs'
 
 const getLogsValidator = [
diff --git a/server/middlewares/validators/oembed.ts b/server/middlewares/validators/oembed.ts
index 505319980..24ba5569d 100644
--- a/server/middlewares/validators/oembed.ts
+++ b/server/middlewares/validators/oembed.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { query } from 'express-validator/check'
+import { query } from 'express-validator'
 import { join } from 'path'
 import { isTestInstance } from '../../helpers/core-utils'
 import { isIdOrUUIDValid } from '../../helpers/custom-validators/misc'
diff --git a/server/middlewares/validators/pagination.ts b/server/middlewares/validators/pagination.ts
index e1ed8cd65..80ae57c0b 100644
--- a/server/middlewares/validators/pagination.ts
+++ b/server/middlewares/validators/pagination.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { query } from 'express-validator/check'
+import { query } from 'express-validator'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
 
diff --git a/server/middlewares/validators/plugins.ts b/server/middlewares/validators/plugins.ts
index dc3f1454a..910d03c29 100644
--- a/server/middlewares/validators/plugins.ts
+++ b/server/middlewares/validators/plugins.ts
@@ -1,10 +1,10 @@
 import * as express from 'express'
-import { body, param, query } from 'express-validator/check'
+import { body, param, query } from 'express-validator'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
 import { isNpmPluginNameValid, isPluginNameValid, isPluginTypeValid, isPluginVersionValid } from '../../helpers/custom-validators/plugins'
 import { PluginManager } from '../../lib/plugins/plugin-manager'
-import { isBooleanValid, isSafePath } from '../../helpers/custom-validators/misc'
+import { isBooleanValid, isSafePath, toBooleanOrNull } from '../../helpers/custom-validators/misc'
 import { PluginModel } from '../../models/server/plugin'
 import { InstallOrUpdatePlugin } from '../../../shared/models/plugins/install-plugin.model'
 import { PluginType } from '../../../shared/models/plugins/plugin.type'
@@ -39,7 +39,7 @@ const listPluginsValidator = [
     .custom(isPluginTypeValid).withMessage('Should have a valid plugin type'),
   query('uninstalled')
     .optional()
-    .toBoolean()
+    .customSanitizer(toBooleanOrNull)
     .custom(isBooleanValid).withMessage('Should have a valid uninstalled attribute'),
 
   (req: express.Request, res: express.Response, next: express.NextFunction) => {
diff --git a/server/middlewares/validators/redundancy.ts b/server/middlewares/validators/redundancy.ts
index edc53a6b2..1fdac0e4e 100644
--- a/server/middlewares/validators/redundancy.ts
+++ b/server/middlewares/validators/redundancy.ts
@@ -1,7 +1,6 @@
 import * as express from 'express'
-import 'express-validator'
-import { body, param } from 'express-validator/check'
-import { exists, isBooleanValid, isIdOrUUIDValid, toIntOrNull } from '../../helpers/custom-validators/misc'
+import { body, param } from 'express-validator'
+import { exists, isBooleanValid, isIdOrUUIDValid, toBooleanOrNull, toIntOrNull } from '../../helpers/custom-validators/misc'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
 import { VideoRedundancyModel } from '../../models/redundancy/video-redundancy'
@@ -68,7 +67,7 @@ const videoPlaylistRedundancyGetValidator = [
 const updateServerRedundancyValidator = [
   param('host').custom(isHostValid).withMessage('Should have a valid host'),
   body('redundancyAllowed')
-    .toBoolean()
+    .customSanitizer(toBooleanOrNull)
     .custom(isBooleanValid).withMessage('Should have a valid redundancyAllowed attribute'),
 
   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
diff --git a/server/middlewares/validators/search.ts b/server/middlewares/validators/search.ts
index 7816d229c..5a3c83f2c 100644
--- a/server/middlewares/validators/search.ts
+++ b/server/middlewares/validators/search.ts
@@ -1,7 +1,7 @@
 import * as express from 'express'
 import { areValidationErrors } from './utils'
 import { logger } from '../../helpers/logger'
-import { query } from 'express-validator/check'
+import { query } from 'express-validator'
 import { isDateValid } from '../../helpers/custom-validators/misc'
 
 const videosSearchValidator = [
diff --git a/server/middlewares/validators/server.ts b/server/middlewares/validators/server.ts
index 6eff8e9ee..f6812647b 100644
--- a/server/middlewares/validators/server.ts
+++ b/server/middlewares/validators/server.ts
@@ -3,7 +3,7 @@ import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
 import { isHostValid, isValidContactBody } from '../../helpers/custom-validators/servers'
 import { ServerModel } from '../../models/server/server'
-import { body } from 'express-validator/check'
+import { body } from 'express-validator'
 import { isUserDisplayNameValid } from '../../helpers/custom-validators/users'
 import { Emailer } from '../../lib/emailer'
 import { Redis } from '../../lib/redis'
diff --git a/server/middlewares/validators/themes.ts b/server/middlewares/validators/themes.ts
index 642f2df78..24a9673f7 100644
--- a/server/middlewares/validators/themes.ts
+++ b/server/middlewares/validators/themes.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { param } from 'express-validator/check'
+import { param } from 'express-validator'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
 import { isPluginNameValid, isPluginVersionValid } from '../../helpers/custom-validators/plugins'
diff --git a/server/middlewares/validators/user-history.ts b/server/middlewares/validators/user-history.ts
index 418313d09..2f1d3cc41 100644
--- a/server/middlewares/validators/user-history.ts
+++ b/server/middlewares/validators/user-history.ts
@@ -1,6 +1,5 @@
 import * as express from 'express'
-import 'express-validator'
-import { body } from 'express-validator/check'
+import { body } from 'express-validator'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
 import { isDateValid } from '../../helpers/custom-validators/misc'
diff --git a/server/middlewares/validators/user-notifications.ts b/server/middlewares/validators/user-notifications.ts
index 3ded8d8cf..308b32655 100644
--- a/server/middlewares/validators/user-notifications.ts
+++ b/server/middlewares/validators/user-notifications.ts
@@ -1,15 +1,14 @@
 import * as express from 'express'
-import 'express-validator'
-import { body, query } from 'express-validator/check'
+import { body, query } from 'express-validator'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
 import { isUserNotificationSettingValid } from '../../helpers/custom-validators/user-notifications'
-import { isNotEmptyIntArray } from '../../helpers/custom-validators/misc'
+import { isNotEmptyIntArray, toBooleanOrNull } from '../../helpers/custom-validators/misc'
 
 const listUserNotificationsValidator = [
   query('unread')
     .optional()
-    .toBoolean()
+    .customSanitizer(toBooleanOrNull)
     .isBoolean().withMessage('Should have a valid unread boolean'),
 
   (req: express.Request, res: express.Response, next: express.NextFunction) => {
diff --git a/server/middlewares/validators/user-subscriptions.ts b/server/middlewares/validators/user-subscriptions.ts
index 2356745d7..9bc8c87e7 100644
--- a/server/middlewares/validators/user-subscriptions.ts
+++ b/server/middlewares/validators/user-subscriptions.ts
@@ -1,6 +1,5 @@
 import * as express from 'express'
-import 'express-validator'
-import { body, param, query } from 'express-validator/check'
+import { body, param, query } from 'express-validator'
 import { logger } from '../../helpers/logger'
 import { areValidationErrors } from './utils'
 import { ActorFollowModel } from '../../models/activitypub/actor-follow'
diff --git a/server/middlewares/validators/users.ts b/server/middlewares/validators/users.ts
index 7002de20d..db03dc231 100644
--- a/server/middlewares/validators/users.ts
+++ b/server/middlewares/validators/users.ts
@@ -1,9 +1,8 @@
 import * as Bluebird from 'bluebird'
 import * as express from 'express'
-import 'express-validator'
-import { body, param } from 'express-validator/check'
+import { body, param } from 'express-validator'
 import { omit } from 'lodash'
-import { isIdOrUUIDValid } from '../../helpers/custom-validators/misc'
+import { isIdOrUUIDValid, toIntOrNull } from '../../helpers/custom-validators/misc'
 import {
   isUserAdminFlagsValid,
   isUserAutoPlayVideoValid,
@@ -358,7 +357,7 @@ const usersVerifyEmailValidator = [
     .not().isEmpty().withMessage('Should have a valid verification string'),
   body('isPendingEmail')
     .optional()
-    .toBoolean(),
+    .customSanitizer(toIntOrNull),
 
   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
     logger.debug('Checking usersVerifyEmail parameters', { parameters: req.params })
diff --git a/server/middlewares/validators/utils.ts b/server/middlewares/validators/utils.ts
index 8f77c9fbd..43e5652fa 100644
--- a/server/middlewares/validators/utils.ts
+++ b/server/middlewares/validators/utils.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { query, validationResult } from 'express-validator/check'
+import { query, validationResult } from 'express-validator'
 import { logger } from '../../helpers/logger'
 
 function areValidationErrors (req: express.Request, res: express.Response) {
diff --git a/server/middlewares/validators/videos/video-abuses.ts b/server/middlewares/validators/videos/video-abuses.ts
index e176e01af..e27d91bb1 100644
--- a/server/middlewares/validators/videos/video-abuses.ts
+++ b/server/middlewares/validators/videos/video-abuses.ts
@@ -1,6 +1,5 @@
 import * as express from 'express'
-import 'express-validator'
-import { body, param } from 'express-validator/check'
+import { body, param } from 'express-validator'
 import { isIdOrUUIDValid, isIdValid } from '../../../helpers/custom-validators/misc'
 import { logger } from '../../../helpers/logger'
 import { areValidationErrors } from '../utils'
diff --git a/server/middlewares/validators/videos/video-blacklist.ts b/server/middlewares/validators/videos/video-blacklist.ts
index db59427c7..3e8c5b30c 100644
--- a/server/middlewares/validators/videos/video-blacklist.ts
+++ b/server/middlewares/validators/videos/video-blacklist.ts
@@ -1,6 +1,6 @@
 import * as express from 'express'
-import { body, param, query } from 'express-validator/check'
-import { isBooleanValid, isIdOrUUIDValid } from '../../../helpers/custom-validators/misc'
+import { body, param, query } from 'express-validator'
+import { isBooleanValid, isIdOrUUIDValid, toBooleanOrNull } from '../../../helpers/custom-validators/misc'
 import { logger } from '../../../helpers/logger'
 import { areValidationErrors } from '../utils'
 import { isVideoBlacklistReasonValid, isVideoBlacklistTypeValid } from '../../../helpers/custom-validators/video-blacklist'
@@ -24,7 +24,7 @@ const videosBlacklistAddValidator = [
   param('videoId').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid videoId'),
   body('unfederate')
     .optional()
-    .toBoolean()
+    .customSanitizer(toBooleanOrNull)
     .custom(isBooleanValid).withMessage('Should have a valid unfederate boolean'),
   body('reason')
     .optional()
diff --git a/server/middlewares/validators/videos/video-captions.ts b/server/middlewares/validators/videos/video-captions.ts
index f8739e27f..f5610222a 100644
--- a/server/middlewares/validators/videos/video-captions.ts
+++ b/server/middlewares/validators/videos/video-captions.ts
@@ -1,7 +1,7 @@
 import * as express from 'express'
 import { areValidationErrors } from '../utils'
 import { isIdOrUUIDValid } from '../../../helpers/custom-validators/misc'
-import { body, param } from 'express-validator/check'
+import { body, param } from 'express-validator'
 import { CONSTRAINTS_FIELDS } from '../../../initializers/constants'
 import { UserRight } from '../../../../shared'
 import { logger } from '../../../helpers/logger'
diff --git a/server/middlewares/validators/videos/video-channels.ts b/server/middlewares/validators/videos/video-channels.ts
index c1065b898..3ee5064fc 100644
--- a/server/middlewares/validators/videos/video-channels.ts
+++ b/server/middlewares/validators/videos/video-channels.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { body, param } from 'express-validator/check'
+import { body, param } from 'express-validator'
 import { UserRight } from '../../../../shared'
 import {
   isVideoChannelDescriptionValid,
diff --git a/server/middlewares/validators/videos/video-comments.ts b/server/middlewares/validators/videos/video-comments.ts
index 1e3e42833..83a0c24b0 100644
--- a/server/middlewares/validators/videos/video-comments.ts
+++ b/server/middlewares/validators/videos/video-comments.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { body, param } from 'express-validator/check'
+import { body, param } from 'express-validator'
 import { UserRight } from '../../../../shared'
 import { isIdOrUUIDValid, isIdValid } from '../../../helpers/custom-validators/misc'
 import { isValidVideoCommentText } from '../../../helpers/custom-validators/video-comments'
diff --git a/server/middlewares/validators/videos/video-imports.ts b/server/middlewares/validators/videos/video-imports.ts
index 8b0dd8960..318dad100 100644
--- a/server/middlewares/validators/videos/video-imports.ts
+++ b/server/middlewares/validators/videos/video-imports.ts
@@ -1,6 +1,6 @@
 import * as express from 'express'
-import { body } from 'express-validator/check'
-import { isIdValid } from '../../../helpers/custom-validators/misc'
+import { body } from 'express-validator'
+import { isIdValid, toIntOrNull } from '../../../helpers/custom-validators/misc'
 import { logger } from '../../../helpers/logger'
 import { areValidationErrors } from '../utils'
 import { getCommonVideoEditAttributes } from './videos'
@@ -13,7 +13,7 @@ import { doesVideoChannelOfAccountExist } from '../../../helpers/middlewares'
 
 const videoImportAddValidator = getCommonVideoEditAttributes().concat([
   body('channelId')
-    .toInt()
+    .customSanitizer(toIntOrNull)
     .custom(isIdValid).withMessage('Should have correct video channel id'),
   body('targetUrl')
     .optional()
diff --git a/server/middlewares/validators/videos/video-playlists.ts b/server/middlewares/validators/videos/video-playlists.ts
index 638122a2e..2e9c8aa33 100644
--- a/server/middlewares/validators/videos/video-playlists.ts
+++ b/server/middlewares/validators/videos/video-playlists.ts
@@ -1,12 +1,20 @@
 import * as express from 'express'
-import { body, param, query, ValidationChain } from 'express-validator/check'
+import { body, param, query, ValidationChain } from 'express-validator'
 import { UserRight, VideoPlaylistCreate, VideoPlaylistUpdate } from '../../../../shared'
 import { logger } from '../../../helpers/logger'
 import { UserModel } from '../../../models/account/user'
 import { areValidationErrors } from '../utils'
 import { isVideoImage } from '../../../helpers/custom-validators/videos'
 import { CONSTRAINTS_FIELDS } from '../../../initializers/constants'
-import { isArrayOf, isIdOrUUIDValid, isIdValid, isUUIDValid, toIntArray, toValueOrNull } from '../../../helpers/custom-validators/misc'
+import {
+  isArrayOf,
+  isIdOrUUIDValid,
+  isIdValid,
+  isUUIDValid,
+  toIntArray,
+  toIntOrNull,
+  toValueOrNull
+} from '../../../helpers/custom-validators/misc'
 import {
   isVideoPlaylistDescriptionValid,
   isVideoPlaylistNameValid,
@@ -374,12 +382,11 @@ function getCommonPlaylistEditAttributes () {
       .custom(isVideoPlaylistDescriptionValid).withMessage('Should have a valid description'),
     body('privacy')
       .optional()
-      .toInt()
+      .customSanitizer(toIntOrNull)
       .custom(isVideoPlaylistPrivacyValid).withMessage('Should have correct playlist privacy'),
     body('videoChannelId')
       .optional()
-      .customSanitizer(toValueOrNull)
-      .toInt()
+      .customSanitizer(toIntOrNull)
   ] as (ValidationChain | express.Handler)[]
 }
 
diff --git a/server/middlewares/validators/videos/video-rates.ts b/server/middlewares/validators/videos/video-rates.ts
index 5bb3f4a51..4021cfecc 100644
--- a/server/middlewares/validators/videos/video-rates.ts
+++ b/server/middlewares/validators/videos/video-rates.ts
@@ -1,6 +1,5 @@
 import * as express from 'express'
-import 'express-validator'
-import { body, param, query } from 'express-validator/check'
+import { body, param, query } from 'express-validator'
 import { isIdOrUUIDValid } from '../../../helpers/custom-validators/misc'
 import { isRatingValid } from '../../../helpers/custom-validators/video-rates'
 import { isVideoRatingTypeValid } from '../../../helpers/custom-validators/videos'
diff --git a/server/middlewares/validators/videos/video-shares.ts b/server/middlewares/validators/videos/video-shares.ts
index 6f4a1f3e0..ace62be5c 100644
--- a/server/middlewares/validators/videos/video-shares.ts
+++ b/server/middlewares/validators/videos/video-shares.ts
@@ -1,6 +1,5 @@
 import * as express from 'express'
-import 'express-validator'
-import { param } from 'express-validator/check'
+import { param } from 'express-validator'
 import { isIdOrUUIDValid, isIdValid } from '../../../helpers/custom-validators/misc'
 import { logger } from '../../../helpers/logger'
 import { VideoShareModel } from '../../../models/video/video-share'
diff --git a/server/middlewares/validators/videos/video-watch.ts b/server/middlewares/validators/videos/video-watch.ts
index a0b530c75..d6ca1d341 100644
--- a/server/middlewares/validators/videos/video-watch.ts
+++ b/server/middlewares/validators/videos/video-watch.ts
@@ -1,6 +1,6 @@
-import { body, param } from 'express-validator/check'
+import { body, param } from 'express-validator'
 import * as express from 'express'
-import { isIdOrUUIDValid } from '../../../helpers/custom-validators/misc'
+import { isIdOrUUIDValid, toIntOrNull } from '../../../helpers/custom-validators/misc'
 import { areValidationErrors } from '../utils'
 import { logger } from '../../../helpers/logger'
 import { doesVideoExist } from '../../../helpers/middlewares'
@@ -8,7 +8,7 @@ import { doesVideoExist } from '../../../helpers/middlewares'
 const videoWatchingValidator = [
   param('videoId').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
   body('currentTime')
-    .toInt()
+    .customSanitizer(toIntOrNull)
     .isInt().withMessage('Should have correct current time'),
 
   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
diff --git a/server/middlewares/validators/videos/videos.ts b/server/middlewares/validators/videos/videos.ts
index 8f5e5c95c..27dfe91ca 100644
--- a/server/middlewares/validators/videos/videos.ts
+++ b/server/middlewares/validators/videos/videos.ts
@@ -1,6 +1,5 @@
 import * as express from 'express'
-import 'express-validator'
-import { body, param, query, ValidationChain } from 'express-validator/check'
+import { body, param, query, ValidationChain } from 'express-validator'
 import { UserRight, VideoChangeOwnershipStatus, VideoPrivacy } from '../../../../shared'
 import {
   isBooleanValid,
@@ -9,6 +8,7 @@ import {
   isIdValid,
   isUUIDValid,
   toArray,
+  toBooleanOrNull,
   toIntOrNull,
   toValueOrNull
 } from '../../../helpers/custom-validators/misc'
@@ -53,7 +53,7 @@ const videosAddValidator = getCommonVideoEditAttributes().concat([
     ),
   body('name').custom(isVideoNameValid).withMessage('Should have a valid name'),
   body('channelId')
-    .toInt()
+    .customSanitizer(toIntOrNull)
     .custom(isIdValid).withMessage('Should have correct video channel id'),
 
   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
@@ -101,7 +101,7 @@ const videosUpdateValidator = getCommonVideoEditAttributes().concat([
     .custom(isVideoNameValid).withMessage('Should have a valid name'),
   body('channelId')
     .optional()
-    .toInt()
+    .customSanitizer(toIntOrNull)
     .custom(isIdValid).withMessage('Should have correct video channel id'),
 
   async (req: express.Request, res: express.Response, next: express.NextFunction) => {
@@ -307,15 +307,15 @@ function getCommonVideoEditAttributes () {
       .custom(isVideoLanguageValid).withMessage('Should have a valid language'),
     body('nsfw')
       .optional()
-      .toBoolean()
+      .customSanitizer(toBooleanOrNull)
       .custom(isBooleanValid).withMessage('Should have a valid NSFW attribute'),
     body('waitTranscoding')
       .optional()
-      .toBoolean()
+      .customSanitizer(toBooleanOrNull)
       .custom(isBooleanValid).withMessage('Should have a valid wait transcoding attribute'),
     body('privacy')
       .optional()
-      .toInt()
+      .customSanitizer(toValueOrNull)
       .custom(isVideoPrivacyValid).withMessage('Should have correct video privacy'),
     body('description')
       .optional()
@@ -331,16 +331,16 @@ function getCommonVideoEditAttributes () {
       .custom(isVideoTagsValid).withMessage('Should have correct tags'),
     body('commentsEnabled')
       .optional()
-      .toBoolean()
+      .customSanitizer(toBooleanOrNull)
       .custom(isBooleanValid).withMessage('Should have comments enabled boolean'),
     body('downloadEnabled')
       .optional()
-      .toBoolean()
+      .customSanitizer(toBooleanOrNull)
       .custom(isBooleanValid).withMessage('Should have downloading enabled boolean'),
     body('originallyPublishedAt')
-        .optional()
-        .customSanitizer(toValueOrNull)
-        .custom(isVideoOriginallyPublishedAtValid).withMessage('Should have a valid original publication date'),
+      .optional()
+      .customSanitizer(toValueOrNull)
+      .custom(isVideoOriginallyPublishedAtValid).withMessage('Should have a valid original publication date'),
     body('scheduleUpdate')
       .optional()
       .customSanitizer(toValueOrNull),
@@ -349,7 +349,7 @@ function getCommonVideoEditAttributes () {
       .custom(isDateValid).withMessage('Should have a valid schedule update date'),
     body('scheduleUpdate.privacy')
       .optional()
-      .toInt()
+      .customSanitizer(toValueOrNull)
       .custom(isScheduleVideoUpdatePrivacyValid).withMessage('Should have correct schedule update privacy')
   ] as (ValidationChain | express.Handler)[]
 }
diff --git a/server/middlewares/validators/webfinger.ts b/server/middlewares/validators/webfinger.ts
index 63a1678ec..d7cfe17f0 100644
--- a/server/middlewares/validators/webfinger.ts
+++ b/server/middlewares/validators/webfinger.ts
@@ -1,5 +1,5 @@
 import * as express from 'express'
-import { query } from 'express-validator/check'
+import { query } from 'express-validator'
 import { isWebfingerLocalResourceValid } from '../../helpers/custom-validators/webfinger'
 import { logger } from '../../helpers/logger'
 import { ActorModel } from '../../models/activitypub/actor'
diff --git a/server/tests/api/check-params/video-imports.ts b/server/tests/api/check-params/video-imports.ts
index 8ff115e7b..231d5cc85 100644
--- a/server/tests/api/check-params/video-imports.ts
+++ b/server/tests/api/check-params/video-imports.ts
@@ -91,7 +91,7 @@ describe('Test video imports API validator', function () {
         support: 'my super support text',
         tags: [ 'tag1', 'tag2' ],
         privacy: VideoPrivacy.PUBLIC,
-        channelId: channelId
+        channelId
       }
     })