How to used Google ReCaptcha V3 in Node Js Express?




How to used Google ReCaptcha V3 in Node Js Express?

Hello Friends,

In this quick example, let's see how to use Google recaptcha v3 in node js express. I would like to share with you node js express google recaptcha v3 to form. this example will help you add a Google captcha in node js expresss. I would like to share with you the integration of Google recaptcha v3 in node js express. Let's see below an example of how to add Google recaptcha v3 in node js express.

This tutorial will show you how to integrate Google reCAPTCHA v3 into your Node.js forms validation. By adding Google reCAPTCHA v3 security to your Node.js forms, you can prevent computer bots and spammers from accessing your website.

Step 1: Get Google reCaptcha v3 credentials

Now, you need to register your site with this URL: get the API key and API secret.

Note:- Google Captcha does not natively support the localhost domain so what you need to do is in the text box of the site name, put your local address: That is it.

Step 2: Create a Node js App

Here you need to create project folder and then type the following command into your command prompt (cmd):

mkdir public

npm init -y

initializing the package.json file.


"name": "googlerecaptcha",

"version": "1.0.0",

"description": "",

"main": "server.js",

"scripts": {

"start": "nodemon server"


"author": "",

"license": "ISC",

"dependencies": {

"body-parser": "^1.17.2",

"ejs": "^2.5.7",

"express": "^4.15.4"


"devDependencies": {

"nodemon": "^1.11.0"



Three packages as dependencies, so go to your terminal and type the command.

npm install

Step 3: Create view file in project

Create one file name index.ejs is called views file. In this file, Add Bootstrap CSS Framework for this application, so you need include that CSS file in the public folder.

<!DOCTYPE html>



<meta charset="utf-8">

<title>Node js Google v3 Recaptcha Example Tutorial</title>

<link rel="stylesheet" href="bootstrap.min.css">



<div class="container"><br />

<h1>Google Recaptcha Tutorial</h1><br />

<form method="post" action="/captcha">

<input type="hidden" id="g-recaptcha-response" name="g-recaptcha-response">

<input type="hidden" name="action" value="validate_captcha">

<div class="row">

<div class="col-md-4"></div>

<div class="form-group col-md-4">

<label for="name">Name:</label>

<input type="text" class="form-control" name="name">



<div class="row">

<div class="col-md-4"></div>

<div class="form-group col-md-4">

<button type="submit" class="btn btn-success" style="margin-left:38px">Send</button>





<script src=" reCAPTCHA site key here"></script>


grecaptcha.ready(function() {

// do request for recaptcha token

// response is promise with passed token

grecaptcha.execute('your reCAPTCHA site key here', {action:'validate_captcha'})

.then(function(token) {

// add token value to form

document.getElementById('g-recaptcha-response').value = token;






To access this page, you need to set up one route in a server.js file.

// server.js

app.get('/', function (req, res) {



Go to your terminal, type following command.

npm start

Go to your browser and type this URL: http://localhost:3000

Step 4: Create server.js and Handle the request at the server-side

Here, you will to do two things. First one is install one HTTP request package called request. So use the following command to install HTTP request package in Node js:

npm install request --save

Second thing creates a server.js file inside your project folder and update the following code into your server.js file:


const express = require('express'),

path = require('path'),

bodyParser = require('body-parser'),

request = require('request');

const app = express();

app.set('view engine', 'ejs');


app.use(bodyParser.urlencoded({extended: true}));


var port = 3000;

app.get('/', function (req, res) {


});'/captcha', function(req, res) {

if(req.body['g-recaptcha-response'] === undefined || req.body['g-recaptcha-response'] === '' || req.body['g-recaptcha-response'] === null)


return res.json({"responseError" : "something goes to wrong"});


const secretKey = "xxxx";

const verificationURL = "" + secretKey + "&response=" + req.body['g-recaptcha-response'] + "&remoteip=" + req.connection.remoteAddress;

request(verificationURL,function(error,response,body) {

body = JSON.parse(body);

if(body.success !== undefined && !body.success) {

return res.json({"responseError" : "Failed captcha verification"});


res.json({"responseSuccess" : "Sucess"});



app.listen(port, function(){

console.log('Server is running at port: ',port);


Put the secret key according to your site. If you submit the form with captcha verification, you will get success in response

Note:- If you do not verify captcha and send the form then, you will get an error in response.

#Node.js Express