Google ReCaptcha V3 middleware for Express.js

Endpoint protection using express validation midlleware.

Prerequisites

• A project in https://www.google.com/recaptcha/admin/.
• A domain name whitelisted in this project.
• A Google recaptcha front-end integration in order to call your backend, who's call the Google API.

:link: Google official documentation

How to ?

1. Import re-captcha middleware

const { verifyGGRecaptchaV3 } = require('express-gg-recaptcha');

2. Plug re-captcha middleware generator on the endpoint to protect

app.use('/protected-path', verifyGGRecaptchaV3(secret, score, logger), controllerAction);

The function takes one required and two optional parameters:

• secret - Google recaptcha secret - Required
• score - Minimal score to consider token as valid, between 0 and 1 - Optional - Default: 0.7
• logger - A local logger who's can be useful to debug - Optional - Default process.stdout

The middleware throws an error when:

• secret is not provided or with an invalid format
• score is provided explicitely but invalid

3. Do request

The middleware expects the token to verify on the request body, plugged on req.body.token.

$ curl --url "https://domain.com/protected-path" --data "token=ggtoken&param=..."

The middleware calls next:

• with a 401 Error if the token verification fails
• with a catched Error if an unexpected error occurs
• with nothing in case of success

In case of success, the token is removed from the req.body object before to call next.

Tests

$ npm run test

License

MIT

Contact

[email protected]