IMPORTANT: In July 2025, we stopped releasing new versions of KTX modules, and we removed the KTX libraries from the Firebase Android BoM (v34.0.0). If you use KTX APIs from the previously released KTX modules, we recommend that you migrate your app to use KTX APIs from the main modules instead. For details, see the FAQ about this initiative.

Firebase

object Firebase

Single access point to all firebase SDKs from Kotlin.

Acts as a target for extension methods provided by sdks.

Summary

Extension functions
`FirebaseApp`	`Firebase.app(name: String)` Returns a named firebase app instance.
`FirebaseApp?`	`Firebase.initialize(context: Context)` Initializes and returns a FirebaseApp.
`FirebaseApp`	`Firebase.initialize(context: Context, options: FirebaseOptions)` Initializes and returns a FirebaseApp.
`FirebaseApp`	`Firebase.initialize( context: Context, options: FirebaseOptions, name: String )` Initializes and returns a FirebaseApp.

Extension properties
`FirebaseApp`	`Firebase.app` Returns the default firebase app instance.
`FirebaseOptions`	`Firebase.options` Returns options of default FirebaseApp

Extension functions

app

fun Firebase.app(name: String): FirebaseApp

Returns a named firebase app instance.

initialize

fun Firebase.initialize(context: Context): FirebaseApp?

Initializes and returns a FirebaseApp.

initialize

fun Firebase.initialize(context: Context, options: FirebaseOptions): FirebaseApp

Initializes and returns a FirebaseApp.

initialize

fun Firebase.initialize(
    context: Context,
    options: FirebaseOptions,
    name: String
): FirebaseApp

Initializes and returns a FirebaseApp.

Extension properties

app

val Firebase.app: FirebaseApp

Returns the default firebase app instance.

options

val Firebase.options: FirebaseOptions

Returns options of default FirebaseApp