Basic routing
Routing refers to determining how an application responds to a client request to a particular endpoint, which is a URI (or path) and a specific HTTP request method (GET, POST, and so on).
Each route can have one or more handler functions, which are executed when the route is matched.
Route definition takes the following structure:
app.METHOD(PATH, HANDLER)
Where:
appis an instance ofexpress.METHODis an HTTP request method, in lowercase.PATHis a path on the server.HANDLERis the function executed when the route is matched.
This tutorial assumes that an instance of express named app is created and the server is running. If you are not familiar with creating an app and starting it, see the Hello world example.
// GET request to the homepage app.get(‘/’, (req, res) => { res.status(200).json({ message: ‘Hello World!’ }) })
// POST request to the homepage app.post(‘/’, (req, res) => { res.status(201).json({ message: ‘Got a POST request’ }) })
// PUT request to /user app.put(‘/user’, (req, res) => { res.status(200).json({ message: ‘Got a PUT request at /user’ }) })
// PATCH request to /user (partial update) app.patch(‘/user’, (req, res) => { res.status(200).json({ message: ‘Got a PATCH request at /user’ }) })
// DELETE request to /user app.delete(‘/user’, (req, res) => { res.status(200).json({ message: ‘Got a DELETE request at /user’ }) })
For more details about routing, see the routing guide.