Google reCAPTCHA Implementation in Next Js

• To implement Google reCAPTCHA in a React.js application using the `react-google-recaptcha` package, you need to follow these steps:
  

Step 1: Get reCAPTCHA keys

• First, you need to register your site with Google reCAPTCHA and get the site key and secret key. You can do this by visiting the Google reCAPTCHA website (https://www.google.com/recaptcha/about/) and signing up for an API key pair for your site.

    NEXT_PUBLIC_GOOGLE_RECAPTCHA_SITE_KEY="LfYD5cpAAAAAFGNeiu2cxxLzDpuFFVRKRC7Ssk66V"

    NEXT_PUBLIC_GOOGLE_RECAPTCHA_SECRET_KEY="LfYD5cpAAAAAGFGJkGjj2DEwHjckue-sZSEpfZma6"

Step 2: Install `react-google-recaptcha`

• You'll need to install the `react-google-recaptcha` package. You can do this by running the following command in your project directory:

    npm install react-google-recaptcha

Step 3: Use `ReCAPTCHA` Component

• In your React component where you want the reCAPTCHA to appear, import `ReCAPTCHA` from `react-google-recaptcha` and use it by passing your site key. Here's an example of how to do it:

    import React, { useState } from 'react';

    import ReCAPTCHA from 'react-google-recaptcha';

    function MyComponent() {

        const [recaptchaValue, setRecaptchaValue] = useState(null);

        const handleOnChange = (value) => {

            console.log("Captcha value:", value);

            // Store the reCAPTCHA value or send it to the server here

            setRecaptchaValue(value);

        };

        return (

            <div>

                <form>

                    {/* Other form inputs go here */}

                    <ReCAPTCHA

                        sitekey="YOUR_SITE_KEY_HERE"

                        onChange={handleOnChange}

                    />

                    <button type="submit">Submit</button>

                </form>

            </div>

        );

    }

    export default MyComponent;

• Replace `"YOUR_SITE_KEY_HERE"` with your actual reCAPTCHA site key.

Step 4: Verifying the reCAPTCHA response on the server

• After the form is submitted, you should verify the reCAPTCHA response on your server. You'll need to send the reCAPTCHA response token (received in `handleOnChange`) to your server and use the reCAPTCHA secret key to verify it with Google's verification endpoint.

Here's a basic example of how you might verify the token on a Node.js server:

    const fetch = require('node-fetch');

    const verifyCaptcha = async (token) => {

        const secretKey = 'YOUR_SECRET_KEY_HERE';

        const response = await fetch(`https://www.google.com/recaptcha/api/siteverify?secret=${secretKey}&response=${token}`, {

            method: 'GET',

        });

        const data = await response.json();

        if (data.success) {

            console.log("Verification successful");

            // Proceed with your form submission or user authentication

        } else {

            console.log("Verification failed", data['error-codes']);

            // Handle verification failure

        }

    };

• Remember to replace `"YOUR_SECRET_KEY_HERE"` with your actual reCAPTCHA secret key. 

• This setup ensures your React application integrates Google reCAPTCHA for added security and spam protection.