How do I define routes in Express?

How do I define routes in Express?

In Express, you can define routes using the app.get(), app.post(), app.put(), and app.delete() methods. For example, to define a GET route for the homepage, you would use: app.get('/', (req, res) => { res.send('Hello World!'); });

Can I define multiple routes in one go?

Yes, you can define multiple routes by chaining them or using a router. For example: app.route('/user') .get((req, res) => { res.send('Get User'); }) .post((req, res) => { res.send('Create User'); });

What about route parameters?

Route parameters can be defined using a colon. For example, app.get('/user/:id', (req, res) => { res.send(User ID: ${req.params.id}); }); allows you to access the user ID from the URL.

How do I handle 404 errors for undefined routes?

You can handle 404 errors by adding a middleware function at the end of your route definitions. For example: app.use((req, res) => { res.status(404).send('404 Not Found'); });