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Installation & Setup in JavaScript

The Firebase Realtime Database is a cloud-hosted database. Data is stored as JSON and synchronized in realtime to every connected client. When you build cross-platform apps with our Android, iOS, and JavaScript SDKs, all of your clients share one Realtime Database instance and automatically receive updates with the newest data.


  1. Add and configure the Firebase JavaScript client SDK into your app.

Configure Realtime Database Rules

The Realtime Database provides a declarative rules language that allows you to define how your data should be structured, how it should be indexed, and when your data can be read from and written to. By default, read and write access to your database is restricted so only authenticated users can read or write data. To get started without setting up Authentication, you can configure your rules for public access. This does make your database open to anyone, even people not using your app, so be sure to restrict your database again when you set up authentication.

Initialize the Realtime Database JavaScript SDK

You must specify your Realtime Database URL when initializing your JavaScript SDK.

You can find your Realtime Database URL in the Database tab in the Firebase console. It will be in the form of https://<databaseName>.firebaseio.com.

Initialize your SDK using the following code snippet:

  // Set the configuration for your app
  // TODO: Replace with your project's config object
  var config = {
    apiKey: "apiKey",
    authDomain: "projectId.firebaseapp.com",
    databaseURL: "https://databaseName.firebaseio.com",
    storageBucket: "bucket.appspot.com"

  // Get a reference to the database service
  var database = firebase.database();

You're ready to start using the Firebase Realtime Database!

Next Steps