How do you handle different HTTP methods in Express.js?

Express has one routing method per HTTP method, named after it in lowercase, such as app.get(), app.post() and app.delete(). Each takes a path and a handler, and the handler runs only when both the method and the path match.

app.get('/users', (req, res) => {
  res.send('GET request');
});
app.post('/users', (req, res) => {
  res.send('POST request');
});
app.put('/users/:id', (req, res) => {
  res.send('PUT request');
});
app.delete('/users/:id', (req, res) => {
  res.send('DELETE request');
});

Here /users answers GET and POST with different handlers, and /users/:id answers PUT and DELETE for one user. A method that no route handles, such as PATCH on /users, falls through to the 404 response. app.get() also answers HEAD requests for the same path.

To keep every method of one path together, chain them with app.route(), such as app.route('/users').get(...).post(...). Use app.all() when one handler must run for every method.