diff --git a/backend/src/controllers/learning-objects.ts b/backend/src/controllers/learning-objects.ts
index 21cf9515..e4318efa 100644
--- a/backend/src/controllers/learning-objects.ts
+++ b/backend/src/controllers/learning-objects.ts
@@ -9,6 +9,7 @@ import { envVars, getEnvVar } from '../util/envVars.js';
 import { FilteredLearningObject, LearningObjectIdentifierDTO, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
 import { UploadedFile } from 'express-fileupload';
 import { AuthenticatedRequest } from '../middleware/auth/authenticated-request';
+import { requireFields } from './error-helper.js';
 
 function getLearningObjectIdentifierFromRequest(req: Request): LearningObjectIdentifierDTO {
     if (!req.params.hruid) {
@@ -22,12 +23,12 @@ function getLearningObjectIdentifierFromRequest(req: Request): LearningObjectIde
 }
 
 function getLearningPathIdentifierFromRequest(req: Request): LearningPathIdentifier {
-    if (!req.query.hruid) {
-        throw new BadRequestException('HRUID is required.');
-    }
+    const { hruid, language } = req.params;
+    requireFields({ hruid });
+
     return {
-        hruid: req.params.hruid,
-        language: (req.query.language as Language) || FALLBACK_LANG,
+        hruid,
+        language: (language as Language) || FALLBACK_LANG,
     };
 }
 
diff --git a/backend/src/controllers/learning-paths.ts b/backend/src/controllers/learning-paths.ts
index d7c45428..35a40785 100644
--- a/backend/src/controllers/learning-paths.ts
+++ b/backend/src/controllers/learning-paths.ts
@@ -10,6 +10,7 @@ import { getAssignmentRepository, getGroupRepository } from '../data/repositorie
 import { AuthenticatedRequest } from '../middleware/auth/authenticated-request.js';
 import { LearningPath, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
 import { getTeacher } from '../services/teachers.js';
+import { requireFields } from './error-helper.js';
 
 /**
  * Fetch learning paths based on query parameters.
@@ -73,6 +74,10 @@ export async function getLearningPaths(req: Request, res: Response): Promise<voi
 function postOrPutLearningPath(isPut: boolean): (req: AuthenticatedRequest, res: Response) => Promise<void> {
     return async (req, res) => {
         const path: LearningPath = req.body;
+        const { hruid: hruidParam, language: languageParam } = req.params;
+
+        requireFields({ hruidParam, languageParam, path });
+
         const teacher = await getTeacher(req.auth!.username);
         if (isPut) {
             if (req.params.hruid !== path.hruid || req.params.language !== path.language) {
@@ -88,10 +93,11 @@ export const postLearningPath = postOrPutLearningPath(false);
 export const putLearningPath = postOrPutLearningPath(true);
 
 export async function deleteLearningPath(req: AuthenticatedRequest, res: Response): Promise<void> {
-    const id: LearningPathIdentifier = {
-        hruid: req.params.hruid,
-        language: req.params.language as Language,
-    };
+    const { hruid, language } = req.params;
+
+    requireFields({ hruid, language });
+
+    const id: LearningPathIdentifier = { hruid, language: language as Language };
     const deletedPath = await learningPathService.deleteLearningPath(id);
     if (deletedPath) {
         res.json(deletedPath);