In Express, routes are handled using the app.get() and app.post() methods. These methods are used to register a callback function that will be executed when the application receives a request with the specified HTTP method and path.
For example, to handle a GET request to the path ‘/’, you would use the following code:
app.get(‘/’, function(req, res) {
res.send(‘Hello World!’);
});
This code will execute the callback function when a GET request is sent to the root path of the application. The req object contains information about the request, while the res object is used to send a response back to the client.