Promise

A Promise represents an eventual (asynchronous) value. A Promise should (eventually) either resolve or reject. When it does, it will call all the callback functions that have been assigned via the .then() or .catch() methods.

firebase.Promise is the same as the native Promise implementation when available in the current environment, otherwise it is a compatible implementation of the Promise/A+ spec.

FirebaseError

Thenable

User

UserInfo

app

auth

database

apps

non-null Array of firebase.app.App

A (read-only) array of all initialized apps.

SDK_VERSION

string

The current SDK version.

initializeApp

initializeApp(options, name) returns firebase.app.App

Creates and initializes a Firebase app instance.

See Initialize the SDK and Initialize multiple apps for detailed documentation.

Returns

non-null firebase.app.App The initialized app.

// Initialize default app
// Retrieve your own options values by adding a web app on
// https://console.firebase.google.com
firebase.initializeApp({
  apiKey: "AIza....",                             // Auth / General Use
  authDomain: "YOUR_APP.firebaseapp.com",         // Auth with popup/redirect
  databaseURL: "https://YOUR_APP.firebaseio.com", // Realtime Database
  storageBucket: "YOUR_APP.appspot.com",          // Storage
  messagingSenderId: "123456789"                  // Cloud Messaging
});

// Initialize another app
var otherApp = firebase.initializeApp({
  databaseURL: "https://<OTHER_DATABASE_NAME>.firebaseio.com",
  storageBucket: "<OTHER_STORAGE_BUCKET>.appspot.com"
}, "otherApp");