Google reCAPTCHA Node.js tutorial

As of my last knowledge update in January 2022, I can provide you with a general guideline on how to integrate Google reCAPTCHA with Node.js. Keep in mind that the details may have changed, so it's always a good idea to refer to the official documentation for the most up-to-date information.

Here's a step-by-step guide on how you might integrate Google reCAPTCHA with a Node.js application:

Get reCAPTCHA API Key:
- Visit the reCAPTCHA website and sign in with your Google account.
- Click on the "+" icon to create a new site.
- Choose the type of reCAPTCHA (v2 "I'm not a robot" Checkbox or v3) and fill in the required information.
- Accept the reCAPTCHA Terms of Service and click on the "Submit" button.
- After submission, you will be provided with the "Site Key" and "Secret Key." Keep these keys secure.

Set Up Node.js Project:

Create a new Node.js project if you haven't already:

                
                    mkdir your-project-name
                    cd your-project-name
                    npm init -y

Install Dependencies:

Install the necessary packages using npm:

                
                    npm install express body-parser axios

Create an Express Server:

Create a simple Express server in your index.js or app.js file:

                
                    const express = require('express');
                    const bodyParser = require('body-parser');
                    const axios = require('axios');
                    
                    const app = express();
                    const port = 3000;
                    
                    app.use(bodyParser.urlencoded({ extended: true }));
                    app.use(express.static('public')); // Assuming your HTML file is in a 'public' directory
                    
                    app.get('/', (req, res) => {
                      res.sendFile(__dirname + '/public/index.html');
                    });
                    
                    app.post('/submit', async (req, res) => {
                      const { grecaptchaResponse } = req.body;
                    
                      // Verify reCAPTCHA token
                      const secretKey = 'YOUR_SECRET_KEY'; // Replace with your secret key
                      const verificationURL = `https://www.google.com/recaptcha/api/siteverify?secret=${secretKey}&response=${grecaptchaResponse}`;
                    
                      try {
                        const recaptchaResponse = await axios.post(verificationURL);
                        const { success } = recaptchaResponse.data;
                    
                        if (success) {
                          // Handle successful verification
                          res.send('Success!');
                        } else {
                          // Handle failed verification
                          res.send('Failed verification. Please try again.');
                        }
                      } catch (error) {
                        console.error('Error verifying reCAPTCHA:', error);
                        res.status(500).send('Internal Server Error');
                      }
                    });
                    
                    app.listen(port, () => {
                      console.log(`Server is running at http://localhost:${port}`);
                    });

Create HTML Form:

Create an HTML file in the 'public' directory (or a directory specified in your server code) with a form that includes the reCAPTCHA widget:

                
                 <!-- public/index.html -->
                <!DOCTYPE html>
                <html lang="en">
                    <head>
                           <meta charset="UTF-8">
                           <meta name="viewport" content="width=device-width, initial-scale=1.0">
                           <title>reCAPTCHA Example</title>
                           <script src="https://www.google.com/recaptcha/api.js" async defer></script>
                    </head>
                    <body>
                         <h1>reCAPTCHA Example</h1>
                    <form action="/submit" method="post">
                        <!-- Your other form fields go here -->
                        <div class="g-recaptcha" data-sitekey="YOUR_SITE_KEY"></div>
                        <br>
                        <button type="submit">Submit</button>
                    </form>
                    </body>
                </html>

Replace YOUR_SECRET_KEY and YOUR_SITE_KEY with the actual keys you obtained from the reCAPTCHA website.

Run Your Application:

Start your Node.js application:

                
                    node index.js

Visit http://localhost:3000 in your web browser and test the reCAPTCHA integration.

This is a basic example, and you might need to adjust it based on the specific requirements of your application. Make sure to check the latest reCAPTCHA documentation for any updates or changes.

Google reCAPTCHA Node.js tutorial

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