Guard Your Web Content from Abuse with reCAPTCHA and Firebase
Blog post from Firebase
reCAPTCHA helps websites distinguish legitimate users from automated bots, protecting costly or abuse-prone backend services while preserving human access. The walkthrough explains how to integrate reCAPTCHA v2 with Firebase Hosting and Cloud Functions by creating and initializing a Firebase project with Hosting and Functions, installing HTTP request modules, and deploying a test site. It then obtains a client site key and server secret key from the reCAPTCHA admin panel, adds a web page that displays the challenge and redirects successful responses to a verification path, and creates an HTTPS Cloud Function that submits the response token to Google’s verification API. Firebase Hosting rewrites map the site’s `/checkRecaptcha` path to the function, allowing verification to appear as part of the hosted website. After deployment, users who complete the challenge are redirected to the backend verification endpoint, which returns distinct messages for successful verification, failed challenges, or API errors.
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