Express.js req.cookies Property

The req.cookies property is used when the user is using cookie-parser middleware. This property is an object that contains cookies sent by the request.

Syntax:

req.cookies

Parameter: No parameters.

Return Value: Object

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 the 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

Example 1: Filename: index.js

var cookieParser = require('cookie-parser');
var express = require('express');
var app = express();
var PORT = 3000;

app.use(cookieParser());

app.get('/', function (req, res) {
  req.cookies.title='GeeksforGeeks';
  console.log(req.cookies);
  res.send();
});

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 and cookie-parser module using the following command:

   npm install express
   npm install cookie-parser
   

3. Run index.js file using below command:

   node index.js

   Output:

   Server listening on PORT 3000
   

4. Now open your browser and go to http://localhost:3000/, now you can see the following output on your console:

   Server listening on PORT 3000
   [Object: null prototype] { title: 'GeeksforGeeks' }
   

Example 2: Filename: index.js

var cookieParser = require('cookie-parser');
var express = require('express');
var app = express();
var PORT = 3000;

app.use(cookieParser());

app.get('/user', function (req, res) {
  req.cookies.name='Gourav';
  req.cookies.age=12;

  console.log(req.cookies);
  res.send();
});

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

Output: Now open your browser and make GET request to http://localhost:3000/user, now you can see the following output on your console:

Server listening on PORT 3000
[Object: null prototype] { name: 'Gourav', age: 12 }

Reference: https://expressjs.com/en/4x/api.html#req.cookies