How to Generate QR Code in Node JS Application

In this article, we will explain to you how to generate QR code in node js application. so we will give you a simple example of a node QR code generator. They are usually used to encode a URL so that someone can simply scan the code and visit a site.

A QR code (Quick Response Code) is a machine-readable optical identifier that can include information about the item to which the code is attached.

so you can see below the node js qr code example.

Node Js Application Setup

First, we will open the command prompt and create the application in our directory. for this, you can follow the below command.

mkdir my_node_app
cd my_node_app
npm init

Install NPM Package

After the done setup node js application, we will install the express and qrcode npm package. so you can see the following npm command.

npm install express --save
npm install qrcode --save

server.js

var express=require('express');
var app = express();
var QRCode = require('qrcode');


app.get('/',function(req,res){
	
	// Creating the data
	let data = {
		name:"test",
		age:27,
		email:"[email protected]"
	}
	 
	// Converting the data into String format
	let stringdata = JSON.stringify(data);
	 
	// Print the QR code to terminal
	QRCode.toString(stringdata,{type:'terminal'},function (err, QRcode) {
		if(err){ 
			return console.log("error occurred");
		}else{
			// Printing the generated code
			console.log(QRcode);
		}
	});
	   
	// Converting the data into base64
	QRCode.toDataURL(stringdata, function (err, code) {
		if(err){ 
			return console.log("error occurred"); 
		}else{
			// Printing the code
			console.log(code);
		}
	})
});

app.listen(3000,function(){
     console.log("Express Started on Port 3000");
});

Run Node js Application

we will run the node js application using the below command. so you can follow the below command.

node server.js

Now you can run the example using the below Url in the browser.

http://localhost:3000