⭐ Next.js ReCaptcha V3

Straightforward solution for using ReCaptcha in your Next.js application.

🗜️ Tiny and Tree-Shakable

🥰 Written in TypeScript

🐅 Highly customizable

😎 Uses next/script component

Install

yarn add next-recaptcha-v3

or

npm install next-recaptcha-v3 --save

Pure ESM package

This package is now pure ESM. It cannot be require()'d from CommonJS.

Generate reCAPTCHA Key

To use ReCaptcha, you need to generate a reCAPTCHA_site_key for your site's domain. You can get one here.

You can either add generated key as a Next.js env variable

NEXT_PUBLIC_RECAPTCHA_SITE_KEY="GTM-XXXXXXX"

or pass it directly to the ReCaptchaProvider using reCaptchaKey attribute.

Getting Started

Wrap your application with ReCaptchaProvider. It will load ReCaptcha script to your document.

import { ReCaptchaProvider } from "next-recaptcha-v3";

const MyApp = ({ Component, pageProps }) => (
  <ReCaptchaProvider reCaptchaKey="[GTM-XXXXXXX]">
    <Component {...pageProps} />
  </ReCaptchaProvider>
);

ReCaptchaProvider uses Next.js Script to add ReCaptcha script to the document.

ReCaptchaProvider Props

You must pass reCaptchaKey if NEXT_PUBLIC_RECAPTCHA_SITE_KEY env variable is not defined.

All extra props are passed directly to the Script tag, so you can use all props from the next/script documentation.

Accessing global context props

You can access global grecaptcha object, script's loading state and other props by calling useReCaptcha hook:

import { useReCaptcha } from "next-recaptcha-v3";

const {
  /** reCAPTCHA_site_key */
  reCaptchaKey,
  /** Global ReCaptcha object */
  grecaptcha,
  /** Is ReCaptcha script loaded */
  loaded,
  /** Is ReCaptcha script failed to load */
  error,
  /** Other hook props */
  ...otherProps
} = useReCaptcha();

reCAPTCHA Enterprise

If you're using reCAPTCHA Enterprise, add useEnterprise to your ReCaptchaProvider. Checkout official quickstart guide here.

import { ReCaptchaProvider } from "next-recaptcha-v3";

const MyApp = ({ Component, pageProps }) => (
  <ReCaptchaProvider useEnterprise>
    <Component {...pageProps} />
  </ReCaptchaProvider>
);

Usage

When invoked, ReCaptcha will analyze the user's behavior and create a one-time token. It can only be used once and is only valid for a couple of minutes, so you should generate it just before the actual validation.

Send the resulting token to the API request to your server. You can then decrypt the token using the ReCaptcha /siteverify API and ignore the call if it came from a bot.

1. React Hook: useReCaptcha (recommended approach)

Use executeRecaptcha function returned from the useReCaptcha hook to generate token. Add a unique action name to better understand at what moment the token was generated.

🛈 Note: Actions might contain only alphanumeric characters, slashes, and underscores. Actions must not be user-specific.

import { useState, useCallback } from "react";
import { useReCaptcha } from "next-recaptcha-v3";

const MyForm = () => {
  const [name, setName] = useState("");

  // Import 'executeRecaptcha' using 'useReCaptcha' hook
  const { executeRecaptcha } = useReCaptcha();

  const handleSubmit = useCallback(
    async (e) => {
      e.preventDefault();

      // Generate ReCaptcha token
      const token = await executeRecaptcha("form_submit");

      // Attach generated token to your API requests and validate it on the server
      fetch("/api/form-submit", {
        method: "POST",
        body: {
          data: { name },
          token,
        },
      });
    },
    [executeRecaptcha, name],
  );

  return (
    <form onSubmit={handleSubmit}>
      <input name="name" value={name} onChange={(e) => setName(e.target.value)} />
      <button type="submit">Submit</button>
    </form>
  );
};

2. ReCaptcha component

Alternatively, you can also generate token by using ReCaptcha component.

import { useEffect, useState } from "react";
import { ReCaptcha } from "next-recaptcha-v3";
import { validateToken } from "./utils";

const MyPage = () => {
  const [token, setToken] = useState<string>(null);

  useEffect(() => {
    if (token) {
      // Validate token and make some actions if it's a bot
      validateToken(token);
    }
  }, [token]);

  return (
    <>
      <ReCaptcha onValidate={setToken} action="page_view" />
      <h1>Hello</h1>
    </>
  );
};

3. withReCaptcha HOC

import { useEffect, useState } from "react";
import { withReCaptcha, WithReCaptchaProps } from "next-recaptcha-v3";
import { validateToken } from "./utils";

interface MyPageProps extends WithReCaptchaProps {}

const MyPage: React.FC<MyPageProps> = ({ loaded, executeRecaptcha }) => {
  const [token, setToken] = useState<string>(null);

  useEffect(() => {
    if (loaded) {
      const generateToken = async () => {
        const newToken = await executeRecaptcha("page_view");
        setToken(newToken);
      };
      generateToken();
    }
  }, [loaded, executeRecaptcha]);

  useEffect(() => {
    if (token) {
      // Validate token and make some actions if it's a bot
      validateToken(token);
    }
  }, [token]);

  return <h1>Hello</h1>;
};

export default withReCaptcha(MyPage);

Helpful links

TypeScript

The module is written in TypeScript and type definitions are included.

Contributing

Contributions, issues and feature requests are welcome!

Show your support

Give a ⭐️ if you like this project!

LICENSE

MIT