Integrating reCAPTCHA v3 in Next.js

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Step 1: Obtain reCAPTCHA v3 credentials

Access Google reCAPTCHA page:

Visit Google reCAPTCHA admin console.
Log in with your Google account if necessary.

Register your website:

Click on “V3” at the top to register a new key for reCAPTCHA v3.
Fill out the form with your project name and domains where reCAPTCHA will be used.

Get site keys:

After registering your site, Google will provide two keys: the site key and the secret key. These keys are essential for integrating reCAPTCHA v3 into your web application.

Step 2: Setup in your Next.js application

Install necessary npm package:

npm install @react-google-recaptcha-v3

Create a reCAPTCHA component:

Create a React component in your Next.js project to handle reCAPTCHA v3 logic.

// components/Recaptcha.js
import { useEffect } from react;
import { useGoogleReCaptcha } from react-google-recaptcha-v3;

const Recaptcha = ({ onVerify }) => {
const { executeRecaptcha } = useGoogleReCaptcha();

useEffect(() => {
const verifyCallback = async () => {
if (executeRecaptcha) {
const token = await executeRecaptcha();
onVerify(token); // Send token to backend or handle verification here
}, [executeRecaptcha, onVerify]);

return null; // This component doesn’t render anything visible in the DOM

export default Recaptcha;

Integrate the component into your form:

// contact.js
import Recaptcha from ../components/Recaptcha;

const ContactPage = () => {
const handleRecaptchaVerify = (token) => {
console.log(reCAPTCHA Token:, token);
// Send token to server for verification

return (
{/* Your form goes here */}
{/* Other form fields */}
<Recaptcha onVerify={handleRecaptchaVerify} />
<button type=“submit”>Submit</button>

export default ContactPage;

Server-side setup:

In your backend (Node.js, Python, PHP, etc.), verify the reCAPTCHA v3 token using the provided secret key from Google.

Differences between reCAPTCHA v2 and reCAPTCHA v3

Interaction mode:

reCAPTCHA v2: Requires users to solve a visible challenge like selecting images or entering text.

reCAPTCHA v3: Operates in the background and evaluates user behavior to provide a risk score.

Visibility for users:

reCAPTCHA v2: Is visible to users as it presents an explicit challenge.

reCAPTCHA v3: Is invisible to users, working behind the scenes without requiring explicit user interaction.

Use of scores:

reCAPTCHA v2: Does not generate a score; it only validates correct challenge responses.

reCAPTCHA v3: Provides a score from 0.0 to 1.0 indicating the likelihood that the user is a bot.


reCAPTCHA v2: Requires including a widget in the form and backend verification.

reCAPTCHA v3: Integrates via a frontend API, with primary verification done on the backend using the secret key.

Additional considerations

Handling null in executeRecaptcha: You may encounter cases where executeRecaptcha could be null temporarily, especially during component initialization. Here’s how to handle it:

// Inside useEffect in Recaptcha.js
useEffect(() => {
const verifyCallback = async () => {
if (executeRecaptcha) {
const token = await executeRecaptcha();
onVerify(token); // Send token to backend or handle verification here
if (executeRecaptcha !== null) {
}, [executeRecaptcha, onVerify]);

Additional References: For more technical details or troubleshooting specific issues, you can refer to the official Google documentation for reCAPTCHA v3 or explore additional resources within the developer community.

This guide provides a solid foundation for effectively integrating reCAPTCHA v3 into your Next.js application, enhancing both security and user experience simultaneously.