diff --git a/backend/src/controllers/teacher-invitations.ts b/backend/src/controllers/teacher-invitations.ts
index f7cfa05a..4956f3e2 100644
--- a/backend/src/controllers/teacher-invitations.ts
+++ b/backend/src/controllers/teacher-invitations.ts
@@ -1,13 +1,7 @@
-import {Request, Response} from 'express';
-import {requireFields} from './error-helper';
-import {
-    createInvitation,
-    deleteInvitation,
-    getAllInvitations,
-    getInvitation,
-    updateInvitation
-} from '../services/teacher-invitations';
-import {TeacherInvitationData} from '@dwengo-1/common/interfaces/teacher-invitation';
+import { Request, Response } from 'express';
+import { requireFields } from './error-helper';
+import { createInvitation, deleteInvitation, getAllInvitations, getInvitation, updateInvitation } from '../services/teacher-invitations';
+import { TeacherInvitationData } from '@dwengo-1/common/interfaces/teacher-invitation';
 
 export async function getAllInvitationsHandler(req: Request, res: Response): Promise<void> {
     const username = req.params.username;
@@ -62,7 +56,9 @@ export async function deleteInvitationHandler(req: Request, res: Response): Prom
     requireFields({ sender, receiver, classId });
 
     const data: TeacherInvitationData = {
-        sender, receiver, class: classId
+        sender,
+        receiver,
+        class: classId,
     };
     const invitation = await deleteInvitation(data);
 
diff --git a/backend/src/data/classes/teacher-invitation-repository.ts b/backend/src/data/classes/teacher-invitation-repository.ts
index 46abc685..c9442e29 100644
--- a/backend/src/data/classes/teacher-invitation-repository.ts
+++ b/backend/src/data/classes/teacher-invitation-repository.ts
@@ -1,8 +1,8 @@
-import {DwengoEntityRepository} from '../dwengo-entity-repository.js';
-import {Class} from '../../entities/classes/class.entity.js';
-import {TeacherInvitation} from '../../entities/classes/teacher-invitation.entity.js';
-import {Teacher} from '../../entities/users/teacher.entity.js';
-import {ClassStatus} from "@dwengo-1/common/util/class-join-request";
+import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
+import { Class } from '../../entities/classes/class.entity.js';
+import { TeacherInvitation } from '../../entities/classes/teacher-invitation.entity.js';
+import { Teacher } from '../../entities/users/teacher.entity.js';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 export class TeacherInvitationRepository extends DwengoEntityRepository<TeacherInvitation> {
     public async findAllInvitationsForClass(clazz: Class): Promise<TeacherInvitation[]> {
diff --git a/backend/src/entities/classes/teacher-invitation.entity.ts b/backend/src/entities/classes/teacher-invitation.entity.ts
index b7451682..6059f155 100644
--- a/backend/src/entities/classes/teacher-invitation.entity.ts
+++ b/backend/src/entities/classes/teacher-invitation.entity.ts
@@ -1,8 +1,8 @@
-import {Entity, Enum, ManyToOne} from '@mikro-orm/core';
+import { Entity, Enum, ManyToOne } from '@mikro-orm/core';
 import { Teacher } from '../users/teacher.entity.js';
 import { Class } from './class.entity.js';
 import { TeacherInvitationRepository } from '../../data/classes/teacher-invitation-repository.js';
-import {ClassStatus} from "@dwengo-1/common/util/class-join-request";
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 /**
  * Invitation of a teacher into a class (in order to teach it).
diff --git a/backend/src/interfaces/teacher-invitation.ts b/backend/src/interfaces/teacher-invitation.ts
index f6cd1698..8fef17af 100644
--- a/backend/src/interfaces/teacher-invitation.ts
+++ b/backend/src/interfaces/teacher-invitation.ts
@@ -1,17 +1,17 @@
-import {TeacherInvitation} from '../entities/classes/teacher-invitation.entity.js';
-import {mapToUserDTO} from './user.js';
-import {TeacherInvitationDTO} from '@dwengo-1/common/interfaces/teacher-invitation';
-import {getTeacherInvitationRepository} from '../data/repositories';
-import {Teacher} from '../entities/users/teacher.entity';
-import {Class} from '../entities/classes/class.entity';
-import {ClassStatus} from "@dwengo-1/common/util/class-join-request";
+import { TeacherInvitation } from '../entities/classes/teacher-invitation.entity.js';
+import { mapToUserDTO } from './user.js';
+import { TeacherInvitationDTO } from '@dwengo-1/common/interfaces/teacher-invitation';
+import { getTeacherInvitationRepository } from '../data/repositories';
+import { Teacher } from '../entities/users/teacher.entity';
+import { Class } from '../entities/classes/class.entity';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 export function mapToTeacherInvitationDTO(invitation: TeacherInvitation): TeacherInvitationDTO {
     return {
         sender: mapToUserDTO(invitation.sender),
         receiver: mapToUserDTO(invitation.receiver),
         classId: invitation.class.classId!,
-        status: invitation.status
+        status: invitation.status,
     };
 }
 
@@ -20,7 +20,7 @@ export function mapToTeacherInvitationDTOIds(invitation: TeacherInvitation): Tea
         sender: invitation.sender.username,
         receiver: invitation.receiver.username,
         classId: invitation.class.classId!,
-        status: invitation.status
+        status: invitation.status,
     };
 }
 
diff --git a/backend/src/routes/teacher-invitations.ts b/backend/src/routes/teacher-invitations.ts
index 6826ec21..772b1351 100644
--- a/backend/src/routes/teacher-invitations.ts
+++ b/backend/src/routes/teacher-invitations.ts
@@ -2,8 +2,9 @@ import express from 'express';
 import {
     createInvitationHandler,
     deleteInvitationHandler,
-    getAllInvitationsHandler, getInvitationHandler,
-    updateInvitationHandler
+    getAllInvitationsHandler,
+    getInvitationHandler,
+    updateInvitationHandler,
 } from '../controllers/teacher-invitations';
 
 const router = express.Router({ mergeParams: true });
diff --git a/backend/src/services/teacher-invitations.ts b/backend/src/services/teacher-invitations.ts
index 19ead9a7..07f61bae 100644
--- a/backend/src/services/teacher-invitations.ts
+++ b/backend/src/services/teacher-invitations.ts
@@ -1,12 +1,12 @@
-import {fetchTeacher} from './teachers';
-import {getTeacherInvitationRepository} from '../data/repositories';
-import {mapToInvitation, mapToTeacherInvitationDTO} from '../interfaces/teacher-invitation';
-import {addClassTeacher, fetchClass} from './classes';
-import {TeacherInvitationData, TeacherInvitationDTO} from '@dwengo-1/common/interfaces/teacher-invitation';
-import {ConflictException} from '../exceptions/conflict-exception';
-import {NotFoundException} from '../exceptions/not-found-exception';
-import {TeacherInvitation} from '../entities/classes/teacher-invitation.entity';
-import {ClassStatus} from "@dwengo-1/common/util/class-join-request";
+import { fetchTeacher } from './teachers';
+import { getTeacherInvitationRepository } from '../data/repositories';
+import { mapToInvitation, mapToTeacherInvitationDTO } from '../interfaces/teacher-invitation';
+import { addClassTeacher, fetchClass } from './classes';
+import { TeacherInvitationData, TeacherInvitationDTO } from '@dwengo-1/common/interfaces/teacher-invitation';
+import { ConflictException } from '../exceptions/conflict-exception';
+import { NotFoundException } from '../exceptions/not-found-exception';
+import { TeacherInvitation } from '../entities/classes/teacher-invitation.entity';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 export async function getAllInvitations(username: string, sent: boolean): Promise<TeacherInvitationDTO[]> {
     const teacher = await fetchTeacher(username);
diff --git a/backend/tests/test_assets/classes/teacher-invitations.testdata.ts b/backend/tests/test_assets/classes/teacher-invitations.testdata.ts
index 35a3d1b8..6337a513 100644
--- a/backend/tests/test_assets/classes/teacher-invitations.testdata.ts
+++ b/backend/tests/test_assets/classes/teacher-invitations.testdata.ts
@@ -1,36 +1,36 @@
-import {EntityManager} from '@mikro-orm/core';
-import {TeacherInvitation} from '../../../src/entities/classes/teacher-invitation.entity';
-import {Teacher} from '../../../src/entities/users/teacher.entity';
-import {Class} from '../../../src/entities/classes/class.entity';
-import {ClassStatus} from "@dwengo-1/common/util/class-join-request";
+import { EntityManager } from '@mikro-orm/core';
+import { TeacherInvitation } from '../../../src/entities/classes/teacher-invitation.entity';
+import { Teacher } from '../../../src/entities/users/teacher.entity';
+import { Class } from '../../../src/entities/classes/class.entity';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 export function makeTestTeacherInvitations(em: EntityManager, teachers: Teacher[], classes: Class[]): TeacherInvitation[] {
     const teacherInvitation01 = em.create(TeacherInvitation, {
         sender: teachers[1],
         receiver: teachers[0],
         class: classes[1],
-        status: ClassStatus.Open
+        status: ClassStatus.Open,
     });
 
     const teacherInvitation02 = em.create(TeacherInvitation, {
         sender: teachers[1],
         receiver: teachers[2],
         class: classes[1],
-        status: ClassStatus.Open
+        status: ClassStatus.Open,
     });
 
     const teacherInvitation03 = em.create(TeacherInvitation, {
         sender: teachers[2],
         receiver: teachers[0],
         class: classes[2],
-        status: ClassStatus.Open
+        status: ClassStatus.Open,
     });
 
     const teacherInvitation04 = em.create(TeacherInvitation, {
         sender: teachers[0],
         receiver: teachers[1],
         class: classes[0],
-        status: ClassStatus.Open
+        status: ClassStatus.Open,
     });
 
     return [teacherInvitation01, teacherInvitation02, teacherInvitation03, teacherInvitation04];
diff --git a/common/src/interfaces/teacher-invitation.ts b/common/src/interfaces/teacher-invitation.ts
index 3158b806..f878b741 100644
--- a/common/src/interfaces/teacher-invitation.ts
+++ b/common/src/interfaces/teacher-invitation.ts
@@ -1,5 +1,5 @@
 import { UserDTO } from './user';
-import {ClassStatus} from "../util/class-join-request";
+import { ClassStatus } from '../util/class-join-request';
 
 export interface TeacherInvitationDTO {
     sender: string | UserDTO;