Manage Firebase installations

The Firebase installations service (FIS) provides a Firebase installation ID (FID) for each installed instance of a Firebase app. The Firebase installation ID is used internally by these Firebase services:

Firebase service	Firebase installations functionality
Firebase Cloud Messaging	Firebase Cloud Messaging uses Firebase installation IDs to target devices for message delivery.
Firebase Crashlytics	Firebase Crashlytics rotates the Crashlytics installation UUID based on changes to the app instance's Firebase installation ID. In the future, the installation ID may be used to enable features that enhance crash reporting and crash management services.
Firebase In-App Messaging	Firebase In-App Messaging uses Firebase installation IDs to target devices for message delivery.
Firebase Performance Monitoring	Performance Monitoring uses Firebase installation IDs to calculate the number of unique Firebase installations that access network resources, to ensure that access patterns are sufficiently anonymous. It also uses Firebase installation IDs with Firebase Remote Config to manage the rate of performance event reporting.
Firebase Remote Config	Remote Config uses Firebase installation IDs to select configuration values to return to end-user devices.
Firebase ML	Credentials called installation auth tokens are used by Firebase ML for device authentication when interacting with app instances, for example, to distribute developer models to app instances.
Firebase User Segmentation Storage	Firebase User Segmentation Storage stores Firebase installation IDs and related attributes and segments to provide targeting information to other Firebase services that use them.

Typically, Firebase services use the Firebase installations service without requiring developers to interact directly with the FIS API. However, there are cases where app developers might want to directly call the FIS API, such as:

To delete a Firebase installation and data tied to the installation.
To retrieve identifiers (Firebase installation IDs) in order to target specific app installations.
To retrieve installation auth tokens to authenticate Firebase installations.

To get started with directly calling the FIS API, add the SDK to your app.

Add the Firebase installations SDK to your app

iOS+

Add the dependency for Firebase installations to your Podfile:
```
pod 'FirebaseInstallations'
```
Run pod install and open the created .xcworkspace file.

Import the FirebaseCore module in your UIApplicationDelegate, as well as any other Firebase modules your app delegate uses. For example, to use Cloud Firestore and Authentication:

SwiftUI

import SwiftUI
import FirebaseCore
import FirebaseFirestore
import FirebaseAuth
// ...

Swift

import FirebaseCore
import FirebaseFirestore
import FirebaseAuth
// ...

Objective-C

@import FirebaseCore;
@import FirebaseFirestore;
@import FirebaseAuth;
// ...

Configure a FirebaseApp shared instance in your app delegate's application(_:didFinishLaunchingWithOptions:) method:

SwiftUI

// Use Firebase library to configure APIs
FirebaseApp.configure()

Swift

// Use Firebase library to configure APIs
FirebaseApp.configure()

Objective-C

// Use Firebase library to configure APIs
[FIRApp configure];

If you're using SwiftUI, you must create an application delegate and attach it to your App struct via UIApplicationDelegateAdaptor or NSApplicationDelegateAdaptor. You must also disable app delegate swizzling. For more information, see the SwiftUI instructions.

SwiftUI

@main
struct YourApp: App {
  // register app delegate for Firebase setup
  @UIApplicationDelegateAdaptor(AppDelegate.self) var delegate

  var body: some Scene {
    WindowGroup {
      NavigationView {
        ContentView()
      }
    }
  }
}

Android

Add the dependency for the Firebase installations Android SDK to your module (app-level) Gradle file (usually app/build.gradle):

implementation 'com.google.firebase:firebase-installations:18.0.0'

JavaScript

Depending on how your web application is hosted, your configuration may be handled automatically or you may need to update your Firebase configuration object.

For example, if your dependencies are added in index.html, add the dependency in the <head> element:

<script src="/__/firebase/11.0.2/firebase-installations.js"></script>

Flutter

From the root directory of your Flutter project, run the following command to install the Firebase installations plugin:
```
flutter pub add firebase_app_installations
```
Rebuild your project:
```
flutter run
```

Import the Firebase installations plugin:

import 'package:firebase_app_installations/firebase_app_installations.dart';

Delete a Firebase installation

Data tied to a Firebase installation is generally not personally identifying. Still, it can be helpful to give users an option to manage and delete this data.

Firebase installation IDs are different for every installation of every application; different applications on the same device have different Firebase installation IDs. Firebase installation IDs identify app installations and data tied to those app installations.

When you delete an installation ID, the data tied to that installation ID is removed from live and backup systems of all Firebase services that use Firebase installation IDs to identify installations within 180 days. This process is described at a high level in Google’s statement on deletion and retention.

Unless you disable all FID-generating services in your app, FIS creates a new ID within a few days. Firebase considers the newly-created ID to be a new Firebase installation, and doesn't associate it with the previous ID or data in any way.

Delete an FID with a client API call

To delete FIDs generated by Firebase services, call the appropriate method from the Firebase installations SDK:

Swift

do {
  try await Installations.installations().delete()
  print("Installation deleted");
} catch {
  print("Error deleting installation: \(error)")
}AppDelegate.swift

Objective-C

[[FIRInstallations installations] deleteWithCompletion:^(NSError *error) {
   if (error != nil) {
     NSLog(@"Error deleting Installation %@", error);
     return;
   }
   NSLog(@"Installation deleted");
}];ObjCSnippets.m

Java

FirebaseInstallations.getInstance().delete()
        .addOnCompleteListener(new OnCompleteListener<Void>() {
    @Override
    public void onComplete(@NonNull Task<Void> task) {
        if (task.isSuccessful()) {
            Log.d("Installations", "Installation deleted");
        } else {
            Log.e("Installations", "Unable to delete Installation");
        }
    }
});MainActivity.java

Kotlin+KTX

FirebaseInstallations.getInstance().delete().addOnCompleteListener { task ->
    if (task.isComplete) {
        Log.d("Installations", "Installation deleted")
    } else {
        Log.e("Installations", "Unable to delete Installation")
    }
}MainActivity.kt

JavaScript

await firebase.installations().delete();index.js

Dart

await FirebaseInstallations.instance.delete();

Delete an FID with a server API call

To delete an FID with a server API call, add the Firebase Admin SDK to your server, if you haven't already.

Once the SDK is added, delete FIDs through a call to the deletion function in your language of choice (note: Except for Node.js, these methods reflect Instance ID naming. However, they all actually delete the FID when called with any current Firebase SDK).

Node.js

// An FIDsent from a client service SDK
const idToDelete = 'eyJhbGciOiJFUzI1N_iIs5';

admin.installations().deleteInstallation(idToDelete);

Java

// An FID sent from a client service SDK
String idToDelete = "eyJhbGciOiJFUzI1N_iIs5";

FirebaseInstanceId.getInstance().deleteInstanceIdAsync(idToDelete).get();

Python

  from firebase_admin import instance_id

  # An FID sent from a client service SDK
  id_to_delete = 'eyJhbGciOiJFUzI1N_iIs5'

  instance_id.delete_instance_id(id_to_delete)

Go

client, err := app.InstanceId(ctx)
if err != nil {
  log.Fatalln("error initializing client", err)
}

iidToDelete := "eyJhbGciOiJFUzI1N_iIs5"
if err := client.DeleteInstanceId(ctx, iidToDelete); err != nil {
  log.Fatalln("error deleting FID", err)
}

When you delete an Firebase installation ID with a server API call, Firebase services start the process to delete the data tied to that installation ID, stop accepting new data for that ID over the course of 1-2 days, and then notify the client app that the ID was deleted. Until Firebase notifies the client app, some of the app's services might still target the ID—for example, a Firebase installation might continue to receive FCM notifications for a few hours.

If you want to delete the current Firebase installation ID and immediately use Firebase services with a new, unrelated ID, use the client API to handle the deletion.

Retrieve client identifiers

If you have a requirement to identify particular installations of your app, you can do so by retrieving the Firebase installation ID. For example, to create segments of app installs for BiqQuery import, or to perform testing during Firebase In-App Messaging development, you can identify and target the correct devices using the corresponding Firebase installation IDs.

To retrieve a Firebase installation ID:

Swift

do {
  let id = try await Installations.installations().installationID()
  print("Installation ID: \(id)")
} catch {
  print("Error fetching id: \(error)")
}AppDelegate.swift

Objective-C

[[FIRInstallations installations] installationIDWithCompletion:^(NSString *identifier, NSError *error) {
  if (error != nil) {
    NSLog(@"Error fetching Installation ID %@", error);
    return;
  }
  NSLog(@"Installation ID: %@", identifier);
}];ObjCSnippets.m

Java

FirebaseInstallations.getInstance().getId()
        .addOnCompleteListener(new OnCompleteListener<String>() {
    @Override
    public void onComplete(@NonNull Task<String> task) {
        if (task.isSuccessful()) {
            Log.d("Installations", "Installation ID: " + task.getResult());
        } else {
            Log.e("Installations", "Unable to get Installation ID");
        }
    }
});MainActivity.java

Kotlin+KTX

FirebaseInstallations.getInstance().id.addOnCompleteListener { task ->
    if (task.isSuccessful) {
        Log.d("Installations", "Installation ID: " + task.result)
    } else {
        Log.e("Installations", "Unable to get Installation ID")
    }
}MainActivity.kt

JavaScript

const installationId = await firebase.installations().getId();
console.log(installationId);index.js

Dart

String id = await FirebaseInstallations.instance.getId();

Retrieve installation auth tokens

Firebase services can authenticate Firebase installations with auth tokens retrieved from FIS. For example, when designing A/B tests for Remote Config, you can authenticate a targeted test device using an installation auth token.

An installation auth token is a short-lived bearer token in JSON web token (JWT) format containing the following information for an installation:

The Firebase installation ID
The associated project (projectNumber)
The associated Firebase application ID (appId)
The token's expiration date

An installation auth token cannot be revoked, and remains valid until its expiration date. The default token lifetime is one week.

To retrieve an installation auth token:

Swift

do {
  let result = try await Installations.installations()
    .authTokenForcingRefresh(true)
  print("Installation auth token: \(result.authToken)")
} catch {
  print("Error fetching token: \(error)")
}AppDelegate.swift

Objective-C

[[FIRInstallations installations] authTokenForcingRefresh:true
                                               completion:^(FIRInstallationsAuthTokenResult *result, NSError *error) {
  if (error != nil) {
    NSLog(@"Error fetching Installation token %@", error);
    return;
  }
  NSLog(@"Installation auth token: %@", [result authToken]);
}];ObjCSnippets.m

Java

FirebaseInstallations.getInstance().getToken(/* forceRefresh */true)
        .addOnCompleteListener(new OnCompleteListener<InstallationTokenResult>() {
    @Override
    public void onComplete(@NonNull Task<InstallationTokenResult> task) {
        if (task.isSuccessful() && task.getResult() != null) {
            Log.d("Installations", "Installation auth token: " + task.getResult().getToken());
        } else {
            Log.e("Installations", "Unable to get Installation auth token");
        }
    }
});MainActivity.java

Kotlin+KTX

val forceRefresh = true
FirebaseInstallations.getInstance().getToken(forceRefresh)
    .addOnCompleteListener { task ->
        if (task.isSuccessful) {
            Log.d("Installations", "Installation auth token: " + task.result?.token)
        } else {
            Log.e("Installations", "Unable to get Installation auth token")
        }
    }MainActivity.kt

JavaScript

const installationToken = await firebase.installations()
    .getToken(/* forceRefresh */ true);
console.log(installationToken);index.js

Dart

String token = await FirebaseInstallations.instance.getToken();

Monitor the Firebase installation ID lifecycle

During the normal operation of an app, Firebase installation IDs (FIDs) don't require special monitoring. However, apps that explicitly retrieve and use FIDs should add logic to monitor the potential deletion or rotation of the FID. Here are some cases where FIDs could be deleted or rotated:

Uninstallation or reinstallation of the app, for instance when an end user installs on a new device.
The end user clears the cache of the app or the device.
FID deletion is triggered in the backend due to app inactivity (currently the threshold for this is 270 days of inactivity).

When apps experience FID rotation or deletion in these kinds of cases, they are assigned a new FID. Also, the installation auth token associated with a deleted FID is deleted, regardless of its own maturity, and is replaced with a new installation auth token.

Apps can monitor these changes and respond accordingly.

To monitor FID rotation:

Swift

installationIDObserver = NotificationCenter.default.addObserver(
        forName: .InstallationIDDidChange,
        object: nil,
        queue: nil
) { (notification) in
  // Fetch new Installation ID
  Task {
    await self.fetchInstallationToken()
  }
}AppDelegate.swift

Objective-C

__weak __auto_type weakSelf = self;
self.installationIDObserver = [[NSNotificationCenter defaultCenter]
        addObserverForName: FIRInstallationIDDidChangeNotification
                    object:nil
                     queue:nil
                usingBlock:^(NSNotification * _Nonnull notification) {
    // Fetch new Installation ID
    [weakSelf fetchInstallationsID];
}];ObjCSnippets.m

An NSNotification named NSNotificationName.InstallationIDDidChange is posted to the default NSNotificationCenter whenever a new FID is assigned.

Android

Kotlin and Java clients should add retry logic to respond on failed calls to retrieve the new FID.

JavaScript

Web apps can subscribe to the onIdChange hook.

Whenever a new FID is created, the subscribed callback is triggered:

await firebase.installations().onIdChange((newId) => {
  console.log(newId);
  // TODO: Handle new installation ID.
});

Dart

FirebaseInstallations.instance.onIdChange.listen((token) {
  print('FID token: $token');
});

Migrate from Instance ID to Firebase installations

Prior to the introduction of Firebase installations, Firebase relied on the Instance ID SDK for identifiers of app installs. Firebase installations provides significant advantages over Instance ID in reliability, performance, and security. Firebase apps that depend on the Instance ID SDK should migrate to Firebase installations.

The migration process is different based on your app:

Apps that don't directly call Instance ID APIs can migrate by updating their SDK versions. Most Firebase apps fall into this category.
Apps that explicitly make API calls to Instance ID must update SDK versions and make code changes to replace Instance ID methods with their Firebase installations or FCM equivalents. If your app uses Instance ID to retrieve FCM registration tokens or explicitly uses Instance ID to target app instances or for any other purpose, you'll need to update your application code.

Currently, FIS is backward-compatible with the legacy identifier Firebase Instance ID. Deleting an IID is an alternative method of requesting data deletion with these Firebase SDKs:

iOS 6.14.0 and lower
Android SDKs earlier than February 27, 2020

This means that apps are not required to migrate to Firebase installations; however, doing so is highly recommended.

Upgrading to minimum SDK versions for Firebase installations

To migrate from Instance ID to Firebase installations, make sure that your applications use at least the listed minimum version numbers of the following Firebase SDKs:

Firebase SDK	Minimum Android version	Minimum iOS version
Firebase Cloud Messaging	v20.3.0	v6.34.0
Remote Config	v19.2.0	v6.24.0
Google Analytics for Firebase \ (Measurement SDK)	v17.4.4	v6.18.0
In-App Messaging	v19.0.7	v6.24.0
Performance Monitoring	v19.0.8	v6.21.0
Crashlytics	v17.2.1	v6.23.0
ML Kit	v22.1.2	v6.28.0

Updating code that explicitly calls Instance ID APIs

If your Android or Apple app directly uses Instance ID SDK methods, you can replace that usage with identical alternatives in the Firebase installations SDK or the FCM SDK.

Retrieving an identifier

Methods to get Instance IDs are replaced with methods to get an installations ID. For example:

Before

Swift

Messaging.messaging().token { token, error in
  if let error = error {
    print("Error fetching remote FCM registration token: \(error)")
  } else if let token = token {
    print("Remote instance ID token: \(token)")
    self.remoteFCMTokenMessage.text = "Remote FCM registration token: \(token)"
  }
}

Objective-C

[[FIRMessaging messaging] tokenWithCompletion:^(NSString * _Nullable token, NSError * _Nullable error) {
   if (error != nil) {
     NSLog(@"Error fetching the remote FCM registration token: %@", error);
   } else {
     NSLog(@"Remote FCM registration token: %@", token);
     NSString* message =
       [NSString stringWithFormat:@"FCM registration token: %@", token];
     self.remoteFCMTokenMessage.text = message;
   }
 }];

Java

FirebaseInstanceId.getInstance().getInstanceId()
        .addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
            @Override
            public void onComplete(@NonNull Task<InstanceIdResult> task) {
                Log.d("IID_TOKEN", task.getResult().getToken());
            }
        });

Kotlin+KTX

FirebaseInstanceId.getInstance().instanceId
        .addOnSuccessListener { result ->
            Log.d("IID_TOKEN", result.token)
        }

After

Swift

do {
  let id = try await Installations.installations().installationID()
  print("Installation ID: \(id)")
} catch {
  print("Error fetching id: \(error)")
}AppDelegate.swift

Objective-C

[[FIRInstallations installations] installationIDWithCompletion:^(NSString *identifier, NSError *error) {
  if (error != nil) {
    NSLog(@"Error fetching Installation ID %@", error);
    return;
  }
  NSLog(@"Installation ID: %@", identifier);
}];ObjCSnippets.m

Java

FirebaseInstallations.getInstance().getId()
        .addOnCompleteListener(new OnCompleteListener<String>() {
    @Override
    public void onComplete(@NonNull Task<String> task) {
        if (task.isSuccessful()) {
            Log.d("Installations", "Installation ID: " + task.getResult());
        } else {
            Log.e("Installations", "Unable to get Installation ID");
        }
    }
});MainActivity.java

Kotlin+KTX

FirebaseInstallations.getInstance().id.addOnCompleteListener { task ->
    if (task.isSuccessful) {
        Log.d("Installations", "Installation ID: " + task.result)
    } else {
        Log.e("Installations", "Unable to get Installation ID")
    }
}MainActivity.kt

Deleting an identifier

Methods to delete Instance IDs are replaced with methods to delete Firebase installation IDs. For example:

Before

Swift

InstanceID.instanceID().deleteID { error in
  if let error = error {
    print("Error deleting instance ID: \(error)")
  }
}

Objective-C

[FIRInstanceID instanceID] deleteIDWithHandler:^(NSError *error) {
  if error != nil {
    NSLog(@"Error deleting instance ID: %@", error);
  }
}];

Android

FirebaseInstanceId.deleteInstanceId();

After

Swift

func delete(completion: @escaping (Error?) -> Void)

Objective-C

- (void)deleteWithCompletion:(nonnull void (^)(NSError *_Nullable))completion;

Java

FirebaseInstallations.getInstance().delete()
        .addOnCompleteListener(new OnCompleteListener<Void>() {
    @Override
    public void onComplete(@NonNull Task<Void> task) {
        if (task.isSuccessful()) {
            Log.d("Installations", "Installation deleted");
        } else {
            Log.e("Installations", "Unable to delete Installation");
        }
    }
});MainActivity.java

Kotlin+KTX

FirebaseInstallations.getInstance().delete().addOnCompleteListener { task ->
    if (task.isComplete) {
        Log.d("Installations", "Installation deleted")
    } else {
        Log.e("Installations", "Unable to delete Installation")
    }
}MainActivity.kt

Retrieving an FCM registration token

Prior to the introduction of Firebase Installations, FCM clients retrieved registration tokens from Instance ID. Now, the FCM SDK provides methods to retrieve the registration token.

Before

Java

FirebaseInstanceId.getInstance().getInstanceId()
        .addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
            @Override
            public void onComplete(@NonNull Task<InstanceIdResult> task) {
                if (!task.isSuccessful()) {
                    Log.w(TAG, "getInstanceId failed", task.getException());
                    return;
                }

                // Get new Instance ID token
                String token = task.getResult().getToken();

                // Log and toast
                String msg = getString(R.string.msg_token_fmt, token);
                Log.d(TAG, msg);
                Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
            }
        });

Kotlin+KTX

FirebaseInstanceId.getInstance().instanceId
        .addOnCompleteListener(OnCompleteListener { task ->
            if (!task.isSuccessful) {
                Log.w(TAG, "getInstanceId failed", task.exception)
                return@OnCompleteListener
            }

            // Get new Instance ID token
            val token = task.result?.token

            // Log and toast
            val msg = getString(R.string.msg_token_fmt, token)
            Log.d(TAG, msg)
            Toast.makeText(baseContext, msg, Toast.LENGTH_SHORT).show()
        })

Swift

Messaging.messaging().token { token, error in
  if let error = error {
    print("Error fetching remote FCM registration token: \(error)")
  } else if let token = token {
    print("Remote instance ID token: \(token)")
    self.remoteFCMTokenMessage.text = "Remote FCM registration token: \(token)"
  }
}

Objective-C

[[FIRMessaging messaging] tokenWithCompletion:^(NSString * _Nullable token, NSError * _Nullable error) {
   if (error != nil) {
     NSLog(@"Error fetching the remote FCM registration token: %@", error);
   } else {
     NSLog(@"Remote FCM registration token: %@", token);
     NSString* message =
       [NSString stringWithFormat:@"FCM registration token: %@", token];
     self.remoteFCMTokenMessage.text = message;
   }
 }];

After

Java

FirebaseMessaging.getInstance().getToken()
    .addOnCompleteListener(new OnCompleteListener<String>() {
        @Override
        public void onComplete(@NonNull Task<String> task) {
          if (!task.isSuccessful()) {
            Log.w(TAG, "Fetching FCM registration token failed", task.getException());
            return;
          }

          // Get new FCM registration token
          String token = task.getResult();

          // Log and toast
          String msg = getString(R.string.msg_token_fmt, token);
          Log.d(TAG, msg);
          Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
        }
    });

Kotlin+KTX

FirebaseMessaging.getInstance().token.addOnCompleteListener(OnCompleteListener { task ->
    if (!task.isSuccessful) {
        Log.w(TAG, "Fetching FCM registration token failed", task.exception)
        return@OnCompleteListener
    }

    // Get new FCM registration token
    val token = task.result

    // Log and toast
    val msg = getString(R.string.msg_token_fmt, token)
    Log.d(TAG, msg)
    Toast.makeText(baseContext, msg, Toast.LENGTH_SHORT).show()
})

Swift

Messaging.messaging().token { token, error in
  if let error = error {
    print("Error fetching FCM registration token: \(error)")
  } else if let token = token {
    print("FCM registration token: \(token)")
    self.fcmRegTokenMessage.text  = "Remote FCM registration token: \(token)"
  }
}

Objective-C

[[FIRMessaging messaging] tokenWithCompletion:^(NSString *token, NSError *error) {
  if (error != nil) {
    NSLog(@"Error getting FCM registration token: %@", error);
  } else {
    NSLog(@"FCM registration token: %@", token);
    self.fcmRegTokenMessage.text = token;
  }
}];