Express.js res.cookie() Function - GeeksforGeeks

05 May, 2021
The res.cookie() function is used to set the cookie name to value. The value parameter may be a string or object converted to JSON.Syntax:  
res.cookie(name, value [, options])
Parameters: The name parameter holds the name of the cookie and the value parameter is the value assigned to the cookie name. The options parameter contains various properties like encode, expires, domain, etc.Return Value: It returns an Object.Installation of express module:  
You can visit the link to Install express module. You can install this package by using this command.  
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.  
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.  
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  
javascript
var express = require('express');var app = express();var PORT = 3000; // Without middlewareapp.get('/', function(req, res){     // key-value    res.cookie('name', 'geeksforgeeks');    res.send("Cookie Set");}); 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:  
The project structure will look like this:  
Make sure you have installed express module using the following command:  
Make sure you have installed express module using the following command:  
npm install express
Run index.js file using below command:  
Run index.js file using below command:  
node index.js
Output:  
Output:  
Server listening on PORT 3000
 Open your browser and go to http://localhost:3000/, now you the following output on your screen:  
 
Open your browser and go to http://localhost:3000/, now you the following output on your screen:  
Cookie Set
 
 
Example 2: Filename: index.js  
javascript
var express = require('express');var app = express();var PORT = 3000; // With middlewareapp.use('/', function(req, res, next){    res.cookie('title', 'GeeksforGeeks');    res.send("Cookie Set");    next();}) app.get('/', function(req, res){    console.log('Cookie SET');}); 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 open the browser and go to http://localhost:3000/, now check your console and you will see the following output:  
Server listening on PORT 3000
Cookie SET
And you will see the following output on your browser:  
Cookie Set
Reference: https://expressjs.com/en/5x/api.html#res.cookie 
surinderdawra388
Express.js
Node.js
Web Technologies
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