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node-grecaptcha-verify

v2.0.1

Published

Simple reCAPTCHA verifier for node

Downloads

2,699

Readme

reCAPTCHA verification helper for node

Implementation of Google reCAPTCHA verify for nodeJS, written in TypeScript. No dependencies. This lib targets reCAPTCHA v3.

Installation

You need to register your website for Google reCAPTCHA to obtain a pair of keys first. Google will give you a SITE KEY and a SECRET KEY. The SITE KEY is used on your website to request a token. To verify the token with this lib, you must use the SECRET KEY.

Install the npm package:

$ npm i --save node-grecaptcha-verify

Usage:


import {ReCAPTCHA} from "node-grecaptcha-verify";

const reCaptcha = new ReCAPTCHA(reCaptchaSecret, parseFloat(process.env.RECAPTCHA_MIN_SCORE));
const verificationResult = await reCaptcha.verify(token);

if (true === verificationResult.isHuman) {
    // requested by a human
} else {
    // requested by a bot
}

If you want to know what Google answered (e.g. to check for errors or get the score):


// get the score
const score = verificationResult.score;

// get errors
const errors = verificationResult.errors;

By default, a score lower than 0.5 is considered a bot. You can set your own threshold by setting it in the constructor. You can also control if the action should be respected and checked.


// set the minimum score for humans to 0.7 (defaults to 0.5)
const reCaptcha = new ReCAPTCHA(<YOUR SITE KEY>, 0.7);

// tell the lib to check if the action matches (the action you sent to reCAPTCHA in the frontend to obtain the token)
const reCaptcha = new ReCAPTCHA(<YOUR SITE KEY>, 0.7);
const isHuman = await reCaptcha.verify(<TOKEN>, <ACTION>);

License

MIT License