# 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:

```typescript

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):

```typescript

// 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.

```typescript

// 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