Reading Query Parameters in Node.js

The query parameter is the variable whose value is passed in the URL in the form of key-value pair at the end of the URL after a question mark (?). For example, www.geeksforgeeks.org?name=abc where, ‘name’ is the key of query parameter whose value is ‘abc’.

We just create a folder and add a file as index.js. To run this file you need to run the following command.

node index.js

Filename: index.js

const express = require("express")
const path = require('path')
const app = express()

var PORT = process.env.port || 3000

// View Engine Setup
app.set("views", path.join(__dirname))
app.set("view engine", "ejs")

app.get("/user", function(req, res){

    var name = req.query.name
    var age = req.query.age

    console.log("Name :", name)
    console.log("Age :", age)
})

app.listen(PORT, function(error){
    if(error) throw error
    console.log("Server created Successfully on PORT", PORT)
})

Steps to run the program:

1. The project structure will look like this:
   
2. Make sure you have installed ‘view engine’ like I have used ‘ejs’ and install express module using the following commands:

   npm install express
   npm install ejs

3. Run index.js file using below command:

   node index.js

4. Open browser and type this URL “http://localhost:3000/user?name=raj&age=20” as shown below:
   
5. Go back to console and you can see the Query parameters key, value as shown below:
   

So this is how you can read Query parameters in Node.js.

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