feat: add authentication routes, update environment variables, and enhance error handling

Backend/index.ts

@@ -1,11 +1,25 @@
+import 'dotenv/config';
 import express from 'express';
 
+import authRoutes from './routes/auth';
+
 const app = express();
 
-app.get('/', (req, res) => {
-  res.send('Hello World');
+app.use(express.json());
+
+app.get('/', (_req, res) => {
+  res.send('API is running');
 });
 
-app.listen(3000, () => {
-  console.log('Server is running on port 3000');
+app.use('/auth', authRoutes);
+
+app.use((err: unknown, _req: express.Request, res: express.Response, _next: express.NextFunction) => {
+  console.error(err);
+  res.status(500).json({ message: 'Internal server error' });
+});
+
+const port = Number(process.env.PORT ?? 3000);
+
+app.listen(port, () => {
+  console.log(`Server is running on port ${port}`);
 });