Google ReCaptcha v3 in Nodejs

Google ReCaptcha v3 in Nodejs

Google V3 Recaptcha In Node.js Example Tutorial From Scratch. Here you will learn how to integrate Google Recaptcha v3 in node js forms validation with example. Or add google v3 ReCaptcha security in your node js forms for prevent the computer bots, spammers to enter your website.

In this node js google v3 recaptcha example tutorial, we will use Node.js and express framework to build a Google v3 Recaptcha Security.

1. Get Google reCaptcha v3 credentials

Now, you need to register your site with this URL: https://www.google.com/recaptcha to 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: 127.0.0.1. That is it.

2. Create a fresh project

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

mkdir public

npm init 

We are initializing the package.json file.

{

  "name": "googlerecaptcha",

  "version": "1.0.0",

  "description": "",

  "main": "server.js",

  "scripts": {

    "start": "nodemon server"

  },

  "author": "tutsmake.com",

  "license": "ISC",

  "dependencies": {

    "body-parser": "^1.17.2",

    "ejs": "^2.5.7",

    "express": "^4.15.4"

  },

  "devDependencies": {

    "nodemon": "^1.11.0"

  }

}

We have written three packages as dependencies, so go to your terminal and type the command.

npm install

3. Create view file in project

Create one file name index.ejs is called views file. In this file, We are using the Bootstrap CSS Framework for this application, so we will include that CSS file in the public folder.

<!-- index.ejs -->
 
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Node js Google v3 Recaptcha Example Tutorial</title>
    <link rel="stylesheet" href="bootstrap.min.css">
  </head>
  <body>
    <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>
        </div>
        <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>
          </div>
        </div>
      </form>
    </div>
 
<script src="https://www.google.com/recaptcha/api.js?render=your reCAPTCHA site key here"></script>
<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;
        });
    });
</script>
 
  </body>
</html>

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

// server.js

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

    res.render('index');

});

Go to your terminal, type following command.

npm start

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

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

Here, we 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:

// server.js
 
const express = require('express'),
    path = require('path'),
    bodyParser = require('body-parser'),
    request = require('request');
 
const app = express();
   app.set('view engine', 'ejs');
   app.use(express.static('public'));
   app.use(bodyParser.urlencoded({extended: true}));
   app.use(bodyParser.json());
   var port = 3000;
 
app.get('/', function (req, res) {
    res.render('index');
});
 
app.post('/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 = "https://www.google.com/recaptcha/api/siteverify?secret=" + secretKey + "&amp;response=" + req.body['g-recaptcha-response'] + "&amp;remoteip=" + req.connection.remoteAddress;
 
  request(verificationURL,function(error,response,body) {
    body = JSON.parse(body);
 
    if(body.success !== undefined &amp;&amp; !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.

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A thoroughly researched list of top NodeJS development companies with ratings & reviews to help hire the best Node.JS developers who provide development services and solutions across the world. List of Leading Node.js development Service Providers...

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Node.js for Beginners - Learn Node.js from Scratch (Step by Step) - Learn the basics of Node.js. This Node.js tutorial will guide you step by step so that you will learn basics and theory of every part. Learn to use Node.js like a professional. You’ll learn: Basic Of Node, Modules, NPM In Node, Event, Email, Uploading File, Advance Of Node.

Node.js for Beginners

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Welcome to my course "Node.js for Beginners - Learn Node.js from Scratch". This course will guide you step by step so that you will learn basics and theory of every part. This course contain hands on example so that you can understand coding in Node.js better. If you have no previous knowledge or experience in Node.js, you will like that the course begins with Node.js basics. otherwise if you have few experience in programming in Node.js, this course can help you learn some new information . This course contain hands on practical examples without neglecting theory and basics. Learn to use Node.js like a professional. This comprehensive course will allow to work on the real world as an expert!
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Top 7 Most Popular Node.js Frameworks You Should Know

Top 7 Most Popular Node.js Frameworks You Should Know

Node.js is an open-source, cross-platform, runtime environment that allows developers to run JavaScript outside of a browser. In this post, you'll see top 7 of the most popular Node frameworks at this point in time (ranked from high to low by GitHub stars).

Node.js is an open-source, cross-platform, runtime environment that allows developers to run JavaScript outside of a browser.

One of the main advantages of Node is that it enables developers to use JavaScript on both the front-end and the back-end of an application. This not only makes the source code of any app cleaner and more consistent, but it significantly speeds up app development too, as developers only need to use one language.

Node is fast, scalable, and easy to get started with. Its default package manager is npm, which means it also sports the largest ecosystem of open-source libraries. Node is used by companies such as NASA, Uber, Netflix, and Walmart.

But Node doesn't come alone. It comes with a plethora of frameworks. A Node framework can be pictured as the external scaffolding that you can build your app in. These frameworks are built on top of Node and extend the technology's functionality, mostly by making apps easier to prototype and develop, while also making them faster and more scalable.

Below are 7of the most popular Node frameworks at this point in time (ranked from high to low by GitHub stars).

Express

With over 43,000 GitHub stars, Express is the most popular Node framework. It brands itself as a fast, unopinionated, and minimalist framework. Express acts as middleware: it helps set up and configure routes to send and receive requests between the front-end and the database of an app.

Express provides lightweight, powerful tools for HTTP servers. It's a great framework for single-page apps, websites, hybrids, or public HTTP APIs. It supports over fourteen different template engines, so developers aren't forced into any specific ORM.

Meteor

Meteor is a full-stack JavaScript platform. It allows developers to build real-time web apps, i.e. apps where code changes are pushed to all browsers and devices in real-time. Additionally, servers send data over the wire, instead of HTML. The client renders the data.

The project has over 41,000 GitHub stars and is built to power large projects. Meteor is used by companies such as Mazda, Honeywell, Qualcomm, and IKEA. It has excellent documentation and a strong community behind it.

Koa

Koa is built by the same team that built Express. It uses ES6 methods that allow developers to work without callbacks. Developers also have more control over error-handling. Koa has no middleware within its core, which means that developers have more control over configuration, but which means that traditional Node middleware (e.g. req, res, next) won't work with Koa.

Koa already has over 26,000 GitHub stars. The Express developers built Koa because they wanted a lighter framework that was more expressive and more robust than Express. You can find out more about the differences between Koa and Express here.

Sails

Sails is a real-time, MVC framework for Node that's built on Express. It supports auto-generated REST APIs and comes with an easy WebSocket integration.

The project has over 20,000 stars on GitHub and is compatible with almost all databases (MySQL, MongoDB, PostgreSQL, Redis). It's also compatible with most front-end technologies (Angular, iOS, Android, React, and even Windows Phone).

Nest

Nest has over 15,000 GitHub stars. It uses progressive JavaScript and is built with TypeScript, which means it comes with strong typing. It combines elements of object-oriented programming, functional programming, and functional reactive programming.

Nest is packaged in such a way it serves as a complete development kit for writing enterprise-level apps. The framework uses Express, but is compatible with a wide range of other libraries.

LoopBack

LoopBack is a framework that allows developers to quickly create REST APIs. It has an easy-to-use CLI wizard and allows developers to create models either on their schema or dynamically. It also has a built-in API explorer.

LoopBack has over 12,000 GitHub stars and is used by companies such as GoDaddy, Symantec, and the Bank of America. It's compatible with many REST services and a wide variety of databases (MongoDB, Oracle, MySQL, PostgreSQL).

Hapi

Similar to Express, hapi serves data by intermediating between server-side and client-side. As such, it's can serve as a substitute for Express. Hapi allows developers to focus on writing reusable app logic in a modular and prescriptive fashion.

The project has over 11,000 GitHub stars. It has built-in support for input validation, caching, authentication, and more. Hapi was originally developed to handle all of Walmart's mobile traffic during Black Friday.