Device token management in Firebase - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a device token in Firebase Cloud Messaging (FCM)?

A device token is a unique identifier assigned to a device by Firebase. It allows the server to send push notifications directly to that specific device.

beginner

Why is it important to manage device tokens properly?

Proper management ensures notifications reach the right devices, avoids sending to invalid tokens, and helps maintain efficient and cost-effective messaging.

intermediate

How should expired or invalid device tokens be handled?

They should be removed from your database to prevent sending messages to unreachable devices, which can cause errors and waste resources.

intermediate

What is a common method to update device tokens when they change?

The app should detect token refresh events and send the new token to your server to update the stored token for that user/device.

advanced

How can you securely store device tokens on your backend?

Store tokens in a secure database with access controls. Avoid exposing tokens publicly and encrypt data if possible to protect user privacy.

What does a Firebase device token uniquely identify?

A A user account

B A specific device for push notifications

C A Firebase project

D A database entry

A device token uniquely identifies a device to receive push notifications.

What should you do when a device token becomes invalid?

A Remove it from your database

B Keep sending notifications to it

C Share it publicly

D Ignore it

Removing invalid tokens prevents errors and wasted resources.

How does your app know when to update a device token?

A When the app is uninstalled

B When the user logs out

C When the token refresh event occurs

D When the device battery is low

Firebase triggers a token refresh event when the token changes.

Why should device tokens be stored securely?

A To allow anyone to send notifications

B To make tokens public

C To speed up app loading

D To protect user privacy and prevent misuse

Secure storage protects tokens from unauthorized access.

Which Firebase service uses device tokens?

A Firebase Cloud Messaging

B Firebase Authentication

C Firebase Realtime Database

D Firebase Hosting

Firebase Cloud Messaging uses device tokens to send notifications.

Explain what a device token is and why it is important in Firebase Cloud Messaging.

Think about how your phone gets messages from apps.

Describe best practices for managing device tokens on your backend.

Consider how to keep your contact list up to date and safe.