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// install firebase admin package in the express js server
yarn add firebase-admin or npm i firebase-admin
// download your firebase project credentials and import it in the index.js file for simplicity
const firebaseCredentials = require('./firebase-credentials.json'); // I named the file firebase-credentials.json
// import initializeApp and cert from firebase-admin/app
const { initializeApp, cert } = require('firebase-admin/app');
// now initialize the application
initializeApp({
credential: cert(firebaseCredentials),
});