Express.js | app.route() Function

The app.route() function returns an instance of a single route, which you can then use to handle HTTP verbs with optional middleware. Use app.route() to avoid duplicate route names (and thus typo errors).

Syntax:

app.route( path )

Installation of express module:

1. You can visit the link to Install express module. You can install this package by using this command.

   npm install express

2. After installing express module, you can check your express version in command prompt using the command.

   npm version express

3. 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

Filename: index.js

var express = require('express');
var app = express();
var PORT = 3000;

app.route('/user')
.get((req, res, next) => {
    res.send('GET request called');
})
.post((req, res, next) => {
res.send('POST request called');
})
.all((req, res, next) => {
res.send('Other requests called');
})

app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Steps to run the program:

1. The project structure will look like this:
   
2. Make sure you have installed express module using following command:

   npm install express

3. Run index.js file using below command:

   node index.js

   Output:

   Server listening on PORT 3000
   

4. Now, if me make POST request to /user we get POST request called, similarly if me make GET request to /user we get GET request called and so on.

So this is how you can use the express app.route() function which returns an instance of a single route, which you can then use to handle HTTP verbs with optional middleware.

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