it's working!!!

server.js

@@ -32,7 +32,7 @@ app.use(express.static(path.join(__dirname, 'public')));
 // --- Routes ---
 
 // API routes
-app.use('/api/auth', authRoutes); // Authentication routes (login, register, logout)
+app.use('/api/auth', authRoutes); // Authentication routes (login, register, logout, status)
 app.use('/api/todos', todoRoutes); // Todo CRUD routes (protected by auth middleware inside the router)
 
 // View routes (serving HTML pages)
@@ -42,10 +42,22 @@ app.use('/', viewRoutes);
 
 
 // --- Global Error Handler (Basic Example) ---
-// Catches errors passed via next(error)
+// Catches errors passed via next(error) or uncaught errors in route handlers
+// ***** GEÄNDERT: Sendet jetzt JSON zurück *****
 app.use((err, req, res, next) => {
-  console.error("Global Error Handler:", err.stack);
-  res.status(500).send('Etwas ist schiefgelaufen!');
+  console.error("Global Error Handler:", err.stack || err); // Log the full error stack
+
+  // Check if the response headers have already been sent
+  if (res.headersSent) {
+    return next(err); // Delegate to default Express error handler if headers are sent
+  }
+
+  // Send a generic JSON error response
+  res.status(500).json({
+      message: 'Ein unerwarteter Serverfehler ist aufgetreten.',
+      // Optional: Nur im Entwicklungsmodus detailliertere Fehler senden
+      // error: process.env.NODE_ENV === 'development' ? err.message : undefined
+  });
 });
 
 // --- Start Server ---