databank verbinding in app.ts uitgezet, dummy json bodies toegevoegd in verschillende routes

backend/src/routes/submission.ts

@@ -3,7 +3,14 @@ const router = express.Router();
 
 // information about an submission with id 'id'
 router.get('/:id', (req, res) => {
-    res.send('submission');
+    res.json({
+        id: req.params.id,
+        student: '0',
+        group: '0',
+        time: new Date(2025, 1, 1),
+        content: 'Wortel 2 is rationeel',
+        learningObject: '0',
+    });
 })
 
 export default router