Anil Singh | Code-sample.com

Initialize the Real-time Database JavaScript SDK - You must specify your Real-time Database URL when initializing your JavaScript SDK. You can find your Real-time Database URL with ProjectId i.e. -         https://fir-demo-63b26.firebaseio.com/ I nitialize your SDK using below code- // Set the configuration for your app < script src= "https://www.gstatic.com/firebasejs/4.4.0/firebase.js" ></ script > < script >   // Initialize Firebase   var config = {     apiKey : "AIza33ACyqBfafJ32Rtt5R12MVvXSBvHa6fD1Q4X" ,     authDomain : "fir-demo-63b26.firebaseapp.com" ,     databaseURL : "https://fir-demo-63b26.firebaseio.com" ,     projectId : "fir-demo-63b16" ,     storageBucket : "fir-demo-63b26.appspot.com" ,     messagingSenderId : "44244534636121"   };   firebase . initializeApp ( config );...