Express.js router.METHOD() Function

Last Updated : 09 Jul, 2020

The router.METHOD() method provides the routing functionality in Express, where METHOD is one of the HTTP methods, such as GET, PUT, POST, and so on, in lowercase.

Syntax:

router.METHOD(path, [callback, ...] callback)

Parameter: The path parameter specifies the path on the URL and callback is the function which is executed when this path is called.

Return Value: Since, it provides the routing functionality, so it can return responses.

Installation of express module:

You can visit the link to Install express module. You can install this package by using this command.
```
npm install express
```
After installing the express module, you can check your express version in command prompt using the command.
```
npm version express
```
After that, you can just create a folder and add a file for example, index.js. To run this file you need to run the following command.
```
node index.js
```

Example 1: Filename: index.js

var express = require('express');
var app = express();
var router = express.Router();
var PORT = 3000;
  
// Single route 
router.get('/user', function (req, res, next) {
    console.log("GET request called");
    res.end();
});
  
app.use(router);
  
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Steps to run the program:

The project structure will look like this:
Make sure you have installed express module using the following command:
```
npm install express
```
Run index.js file using below command:
```
node index.js
```
Output:
```
Server listening on PORT 3000
```
Now make GET request to http://localhost:3000/, you can see the following output on your screen:
```
Server listening on PORT 3000
GET request called
```

Example 2: Filename: index.js

var express = require('express');
var app = express();
var router = express.Router();
var PORT = 3000;
  
// Multiple routes  
router.get('/user', function (req, res, next) {
    console.log("GET request called");
    res.end();
});
  
router.post('/user', function (req, res, next) {
    console.log("POST request called");
    res.end();
});
  
router.delete('/user', function (req, res, next) {
    console.log("DELETE request called");
    res.end();
})
  
app.use(router);
  
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Run index.js file using below command:

node index.js

Now make GET, POST, DELETE request to http://localhost:3000/, you can see the following output on your screen:

Server listening on PORT 3000
GET request called
POST request called
DELETE request called

Reference: https://expressjs.com/en/4x/api.html#router.METHOD

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