App Check

https://firebase.google.com/docs/app-check/web/recaptcha-provider?authuser=0&hl=en

Installation node.js

const { initializeApp } = require("firebase/app");
const { initializeAppCheck, ReCaptchaV3Provider } = require("firebase/app-check");

const app = initializeApp({
  // Your firebase configuration object
});

// Pass your reCAPTCHA v3 site key (public key) to activate(). Make sure this
// key is the counterpart to the secret key you set in the Firebase console.
const appCheck = initializeAppCheck(app, {
  provider: new ReCaptchaV3Provider('abcdefghijklmnopqrstuvwxy-1234567890abcd'),

  // Optional argument. If true, the SDK automatically refreshes App Check
  // tokens as needed.
  isTokenAutoRefreshEnabled: true
});