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.

com.google.firebase.appcheck

Interfaces

`AppCheckProvider`	Interface for a provider that generates `AppCheckToken`s.
`AppCheckProviderFactory`	Interface for a factory that generates `AppCheckProvider`s.
`FirebaseAppCheck.AppCheckListener`

Classes

`AppCheckToken`	Class to hold tokens emitted by the Firebase App Check service which are minted upon a successful application verification.
`FirebaseAppCheck`

Extension functions summary

`FirebaseAppCheck`	`Firebase.appCheck(app: FirebaseApp)` Returns the `FirebaseAppCheck` instance of a given `FirebaseApp`.
`operator String`	`AppCheckToken.component1()` Destructuring declaration for `AppCheckToken` to provide token.
`operator Long`	`AppCheckToken.component2()` Destructuring declaration for `AppCheckToken` to provide expireTimeMillis.

Extension properties summary

FirebaseAppCheck

Firebase.appCheck

Returns the FirebaseAppCheck instance of the default FirebaseApp.

Extension functions

appCheck

fun Firebase.appCheck(app: FirebaseApp): FirebaseAppCheck

Returns the FirebaseAppCheck instance of a given FirebaseApp.

component1

operator fun AppCheckToken.component1(): String

Destructuring declaration for AppCheckToken to provide token.

Returns
`String`	the token of the `AppCheckToken`

component2

operator fun AppCheckToken.component2(): Long

Destructuring declaration for AppCheckToken to provide expireTimeMillis.

Returns
`Long`	the expireTimeMillis of the `AppCheckToken`

Extension properties

appCheck

val Firebase.appCheck: FirebaseAppCheck

Returns the FirebaseAppCheck instance of the default FirebaseApp.