diff --git a/backend/src/controllers/learningPaths.ts b/backend/src/controllers/learningPaths.ts
index cf084e2b..8c86f0d2 100644
--- a/backend/src/controllers/learningPaths.ts
+++ b/backend/src/controllers/learningPaths.ts
@@ -3,6 +3,7 @@ import { themes } from '../data/themes.js';
 import {DWENGO_API_BASE, FALLBACK_LANG} from '../config.js';
 import { fetchWithLogging } from "../util/apiHelper.js";
 import { fetchLearningPaths } from "../services/learningPaths.js";
+import {LearningPath} from "../interfaces/learningPath";
 
 /**
  * Fetch learning paths based on HRUIDs or return all if no HRUIDs are provided.
@@ -14,13 +15,13 @@ export async function getLearningPaths(req: Request, res: Response): Promise<voi
         const hruids = req.query.hruids; // Can be string or array
         const language = (req.query.language as string) || FALLBACK_LANG;
 
-        let hruidList: string[] = [];
+        let hruidList: string[];
 
         if (hruids) {
             hruidList = Array.isArray(hruids) ? hruids.map(String) : [String(hruids)];
         } else {
             // If no hruids are provided, fetch ALL learning paths
-            hruidList = themes.flatMap((theme) => theme.hruids);
+            hruidList = themes.flatMap((theme) => {return theme.hruids});
         }
 
         const learningPaths = await fetchLearningPaths(hruidList, language, `HRUIDs: ${hruidList.join(', ')}`);
@@ -41,7 +42,7 @@ export async function getLearningPathsByTheme(req: Request, res: Response): Prom
         const themeKey = req.params.theme;
         const language = (req.query.language as string) || FALLBACK_LANG;
 
-        const theme = themes.find((t) => t.title === themeKey);
+        const theme = themes.find((t) => {return t.title === themeKey});
         if (!theme) {
             console.error(`⚠️ WARNING: Theme "${themeKey}" not found.`);
             res.status(404).json({ error: 'Theme not found' });
@@ -75,7 +76,7 @@ export async function searchLearningPaths(req: Request, res: Response): Promise<
         const apiUrl = `${DWENGO_API_BASE}/learningPath/search`;
         const params = { all: query, language };
 
-        const searchResults = await fetchWithLogging<any>(apiUrl, `Search learning paths with query "${query}"`, params);
+        const searchResults = await fetchWithLogging<LearningPath[]>(apiUrl, `Search learning paths with query "${query}"`, params);
         res.json(searchResults ?? []);
     } catch (error) {
         console.error('❌ Unexpected error searching learning paths:', error);
diff --git a/backend/src/interfaces/learningPath.ts b/backend/src/interfaces/learningPath.ts
index 6f187bec..1e2cc6ef 100644
--- a/backend/src/interfaces/learningPath.ts
+++ b/backend/src/interfaces/learningPath.ts
@@ -1,8 +1,23 @@
-export interface LearningPathResponse {
-    success: boolean;
-    source: string;
-    data: LearningPath[] | null;
-    message?: string;
+export interface Transition {
+    default: boolean;
+    _id: string;
+    next: {
+        _id: string;
+        hruid: string;
+        version: number;
+        language: string;
+    };
+}
+
+export interface LearningObjectNode {
+    _id: string;
+    learningobject_hruid: string;
+    version: number;
+    language: string;
+    start_node?: boolean;
+    transitions: Transition[];
+    created_at: string;
+    updatedAt: string;
 }
 
 export interface LearningPath {
@@ -22,26 +37,14 @@ export interface LearningPath {
     __order: number;
 }
 
-export interface LearningObjectNode {
-    _id: string;
-    learningobject_hruid: string;
-    version: number;
-    language: string;
-    start_node?: boolean;
-    transitions: Transition[];
-    created_at: string;
-    updatedAt: string;
+export interface EducationalGoal {
+    source: string;
+    id: string;
 }
 
-export interface Transition {
-    default: boolean;
-    _id: string;
-    next: {
-        _id: string;
-        hruid: string;
-        version: number;
-        language: string;
-    };
+export interface ReturnValue {
+    callback_url: string;
+    callback_schema: Record<string, any>;
 }
 
 export interface LearningObjectMetadata {
@@ -65,16 +68,6 @@ export interface LearningObjectMetadata {
     return_value?: ReturnValue;
 }
 
-export interface EducationalGoal {
-    source: string;
-    id: string;
-}
-
-export interface ReturnValue {
-    callback_url: string;
-    callback_schema: Record<string, any>;
-}
-
 export interface FilteredLearningObject {
     key: string;
     _id: string;
@@ -96,3 +89,10 @@ export interface FilteredLearningObject {
     skosConcepts?: string[];
     returnValue?: ReturnValue;
 }
+
+export interface LearningPathResponse {
+    success: boolean;
+    source: string;
+    data: LearningPath[] | null;
+    message?: string;
+}
diff --git a/backend/src/services/learningObjects.ts b/backend/src/services/learningObjects.ts
index e753ad26..f4da4faf 100644
--- a/backend/src/services/learningObjects.ts
+++ b/backend/src/services/learningObjects.ts
@@ -50,12 +50,12 @@ export async function getLearningObjectsFromPath(
                     `Metadata for Learning Object HRUID "${node.learningobject_hruid}" (version ${node.version}, language ${language})`
                 );
 
-                if (!metadata) return null;
+                if (!metadata) {return null;}
 
                 const htmlUrl = `${DWENGO_API_BASE}/learningObject/getRaw?hruid=${node.learningobject_hruid}&version=${node.version}&language=${language}`;
                 return filterLearningObjectMetadata(metadata, htmlUrl);
             })
-        ).then((objects) => objects.filter((obj): obj is FilteredLearningObject => obj !== null));
+        ).then((objects) => {return objects.filter((obj): obj is FilteredLearningObject => {return obj !== null})});
     } catch (error) {
         console.error('Error fetching learning objects:', error);
         return [];