diff --git a/backend/src/routes/groups.ts b/backend/src/routes/groups.ts
index 54c32462..7f973972 100644
--- a/backend/src/routes/groups.ts
+++ b/backend/src/routes/groups.ts
@@ -1,5 +1,12 @@
 import express from 'express';
-import { createGroupHandler, deleteGroupHandler, getAllGroupsHandler, getGroupHandler, getGroupSubmissionsHandler, putGroupHandler } from '../controllers/groups.js';
+import {
+    createGroupHandler,
+    deleteGroupHandler,
+    getAllGroupsHandler,
+    getGroupHandler,
+    getGroupSubmissionsHandler,
+    putGroupHandler,
+} from '../controllers/groups.js';
 
 const router = express.Router({ mergeParams: true });
 
diff --git a/backend/src/services/assignments.ts b/backend/src/services/assignments.ts
index d703e7f4..55f4947c 100644
--- a/backend/src/services/assignments.ts
+++ b/backend/src/services/assignments.ts
@@ -69,7 +69,7 @@ export async function getAssignment(classid: string, id: number): Promise<Assign
 
 export async function putAssignment(classid: string, id: number, assignmentData: Partial<EntityDTO<Assignment>>): Promise<AssignmentDTO> {
     const assignment = await fetchAssignment(classid, id);
-    
+
     await putObject<Assignment>(assignment, assignmentData, getAssignmentRepository());
 
     return mapToAssignmentDTO(assignment);
diff --git a/backend/src/services/classes.ts b/backend/src/services/classes.ts
index c9d44730..4abe18af 100644
--- a/backend/src/services/classes.ts
+++ b/backend/src/services/classes.ts
@@ -134,9 +134,9 @@ export async function addClassStudent(classId: string, username: string): Promis
     const cls = await fetchClass(classId);
     const newStudent = await fetchStudent(username);
 
-    const newStudents = { students: [...cls.students, newStudent] }
+    const newStudents = { students: [...cls.students, newStudent] };
     await putObject<Class>(cls, newStudents, getClassRepository());
-    
+
     return mapToClassDTO(cls);
 }
 
@@ -145,7 +145,7 @@ export async function addClassTeacher(classId: string, username: string): Promis
     const newTeacher = await fetchTeacher(username);
 
     const newTeachers = { teachers: [...cls.teachers, newTeacher] };
-    await putObject<Class>(cls, newTeachers, getClassRepository());    
+    await putObject<Class>(cls, newTeachers, getClassRepository());
 
     return mapToClassDTO(cls);
 }
diff --git a/backend/src/services/groups.ts b/backend/src/services/groups.ts
index 40bad732..9b9903ed 100644
--- a/backend/src/services/groups.ts
+++ b/backend/src/services/groups.ts
@@ -37,9 +37,9 @@ export async function getGroup(classId: string, assignmentNumber: number, groupN
 }
 
 export async function putGroup(
-    classId: string, 
-    assignmentNumber: number, 
-    groupNumber: number, 
+    classId: string,
+    assignmentNumber: number,
+    groupNumber: number,
     groupData: Partial<EntityDTO<Group>>
 ): Promise<GroupDTO> {
     const group = await fetchGroup(classId, assignmentNumber, groupNumber);
diff --git a/backend/src/services/service-helper.ts b/backend/src/services/service-helper.ts
index 47c4b757..641fada4 100644
--- a/backend/src/services/service-helper.ts
+++ b/backend/src/services/service-helper.ts
@@ -11,8 +11,8 @@ import { DwengoEntityRepository } from '../data/dwengo-entity-repository';
  * @returns Nothing.
  */
 export async function putObject<T extends object>(
-    object: T, 
-    data: Partial<EntityDTO<FromEntityType<T>>>, 
+    object: T,
+    data: Partial<EntityDTO<FromEntityType<T>>>,
     repo: DwengoEntityRepository<T>
 ): Promise<void> {
     repo.assign(object, data);