diff --git a/app.js b/app.js
index f56bf57..f62da7c 100644
--- a/app.js
+++ b/app.js
@@ -3,9 +3,15 @@ const express = require('express');
 const app = express();
 const swaggerUi = require('swagger-ui-express');
 const swaggerSpec = require('./swagger');
+const cors = require('cors');
 const db = require('./config/db');
 
 // Middlewares
+app.use(cors({
+    origin: '*',
+    methods: ["GET", "POST", "PUT", "DELETE"],
+    credentials: true,
+}));
 app.use(express.json());
 
 // Swagger
diff --git a/controllers/groupController.js b/controllers/groupController.js
index 18fd4f0..62e0dff 100644
--- a/controllers/groupController.js
+++ b/controllers/groupController.js
@@ -1,30 +1,30 @@
 const db = require('../config/db');
 
 exports.getAllGroups = async (req, res) => {
-    const [rows] = await db.query('SELECT * FROM groups');
+    const [rows] = await db.query('SELECT * FROM `groups`');
     res.json(rows);
 };
 
 exports.getGroupById = async (req, res) => {
-    const [rows] = await db.query('SELECT * FROM groups WHERE id = ?', [req.params.id]);
+    const [rows] = await db.query('SELECT * FROM `groups` WHERE id = ?', [req.params.id]);
     if (rows.length === 0) return res.status(404).json({ error: 'Group not found' });
     res.json(rows[0]);
 };
 
 exports.createGroup = async (req, res) => {
     const { name } = req.body;
-    await db.query('INSERT INTO groups (name) VALUES (?)', [name]);
+    await db.query('INSERT INTO `groups` (name) VALUES (?)', [name]);
     res.status(201).json({ message: 'Group created' });
 };
 
 exports.updateGroup = async (req, res) => {
     const { name } = req.body;
-    await db.query('UPDATE groups SET name = ? WHERE id = ?', [name, req.params.id]);
+    await db.query('UPDATE `groups` SET name = ? WHERE id = ?', [name, req.params.id]);
     res.json({ message: 'Group updated' });
 };
 
 exports.deleteGroup = async (req, res) => {
-    await db.query('DELETE FROM groups WHERE id = ?', [req.params.id]);
+    await db.query('DELETE FROM `groups` WHERE id = ?', [req.params.id]);
     res.status(204).send();
 };
 
@@ -39,7 +39,7 @@ exports.getGroupUsers = async (req, res) => {
 
 exports.getGroupCours = async (req, res) => {
     const [rows] = await db.query(`
-    SELECT c.* FROM courses c
+    SELECT c.* FROM cours c
     JOIN group_cours gc ON gc.cours_id = c.id
     WHERE gc.group_id = ?
   `, [req.params.id]);
@@ -64,6 +64,6 @@ exports.removeUserFromGroup = async (req, res) => {
 };
 
 exports.removeCoursFromGroup = async (req, res) => {
-    await db.query('DELETE FROM group_courses WHERE group_id = ? AND course_id = ?', [req.params.id, req.params.courseId]);
+    await db.query('DELETE FROM group_cours WHERE group_id = ? AND cours_id = ?', [req.params.id, req.params.coursId]);
     res.status(204).send();
 };
diff --git a/package-lock.json b/package-lock.json
index 02f78ad..61fa6a7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
+        "cors": "^2.8.5",
         "dotenv": "^17.1.0",
         "express": "^5.1.0",
         "mysql2": "^3.14.1",
@@ -241,6 +242,19 @@
         "node": ">=6.6.0"
       }
     },
+    "node_modules/cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
+      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
+      "license": "MIT",
+      "dependencies": {
+        "object-assign": "^4",
+        "vary": "^1"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
     "node_modules/debug": {
       "version": "4.4.1",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.1.tgz",
@@ -825,6 +839,15 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/object-assign": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
+      "integrity": "sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/object-inspect": {
       "version": "1.13.4",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.13.4.tgz",
diff --git a/package.json b/package.json
index 110df30..3c57c64 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "dependencies": {
+    "cors": "^2.8.5",
     "dotenv": "^17.1.0",
     "express": "^5.1.0",
     "mysql2": "^3.14.1",
diff --git a/routes/groups.js b/routes/groups.js
index dd6085c..b81fd31 100644
--- a/routes/groups.js
+++ b/routes/groups.js
@@ -170,7 +170,7 @@ router.post('/:id/users', groupController.addUserToGroup);
  *           schema:
  *             type: object
  *             properties:
- *               courseId: { type: integer }
+ *               coursId: { type: integer }
  *     responses:
  *       200:
  *         description: Cours added to group
@@ -200,9 +200,9 @@ router.delete('/:id/users/:userId', groupController.removeUserFromGroup);
 
 /**
  * @swagger
- * /groups/{id}/cours/{courseId}:
+ * /groups/{id}/cours/{coursId}:
  *   delete:
- *     summary: Remove a course from a group
+ *     summary: Remove a cours from a group
  *     tags: [Groups]
  *     parameters:
  *       - in: path
@@ -210,13 +210,13 @@ router.delete('/:id/users/:userId', groupController.removeUserFromGroup);
  *         required: true
  *         schema: { type: integer }
  *       - in: path
- *         name: courseId
+ *         name: coursId
  *         required: true
  *         schema: { type: integer }
  *     responses:
  *       204:
  *         description: Removed
  */
-router.delete('/:id/cours/:courseId', groupController.removeCoursFromGroup);
+router.delete('/:id/cours/:coursId', groupController.removeCoursFromGroup);
 
 module.exports = router;