Express.js req.param() Function - GeeksforGeeks

27 Apr, 2021
The req.param() function basically returns the value of param name when present. When parameters are passed, then it can be accessed using this function.Syntax:  
req.param(name [, defaultValue])
Parameter: The name parameter is the name of the parameter.Return Value: String.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;   app.get('/', function (req, res) {    //reading single parameter    console.log(req.param('title'));    res.end();}); 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
 Now make a GET request to http://localhost:3000?title=GeeksforGeeks, then you will see the following output on your console:  
 
Now make a GET request to http://localhost:3000?title=GeeksforGeeks, then you will see the following output on your console:  
Server listening on PORT 3000
GeeksforGeeks
 
 
Example 2: Filename: index.js  
javascript
var express = require('express');var app = express();var PORT = 3000;   app.get('/', function (req, res) {     // Reading multiple parameter    console.log("Title:", req.param('title'));    console.log("Domain:", req.param('domain'));         res.end();}); 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 a GET request to http://localhost:3000?title=GeeksforGeeks&domain=CS, then you will see the following output on your console:  
Server listening on PORT 3000
Title: GeeksforGeeks
Domain: CS
Reference: https://expressjs.com/en/4x/api.html#req.param 
simmytarika5
Express.js
Node.js
Web Technologies
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