What is the maximum length of an FCM registration ID token?

in most cases length of a registrationID equals 162 symbols, but can be variations to 119 symbols, maybe other lengths too; it consists only from this chars: [0-9a-zA-Z-_]*

What is FCM registration ID?

The registration_ids parameter refers to the Registration Tokens you want to add in that specific Device Group. Described as: An ID generated by the FCM SDK for each client app instance. Required for single device and device group messaging. Note that registration tokens must be kept secret.

How can I get FCM registration token?

Using new API, you can get token like this: FirebaseInstanceId. getInstance(). getInstanceId().

New Firebase token is generated ( onTokenRefresh() is called) when:

  1. The app deletes Instance ID.
  2. The app is restored on a new device.
  3. The user uninstalls/reinstall the app.
  4. The user clears app data.

What is firebase FCM token?

Firebase Cloud Messaging (FCM) is a messaging solution that lets you reliably send messages at no cost to both Android & iOS devices. Using FCM, you can send data payloads (via a message) to a device for a specific application. Each message can transfer a payload of up to 4KB to a client.

Does FCM token change?

Similarly to how GCM works, the FCM token can change due to token-rotation. Note: the token rotation is a rare-event. Don’t expect to see it often. But still, if you care about the token you should implement onTokenRefresh() to be informed of changes.

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How long do FCM tokens last?

The message expires: You can set message expiry through the API. The maximum time that FCM will retry is 28 days, which is the default value.

How long FCM Token expired?

It doesn’t expire though.

Is FCM really free?

Send messages to any device

Firebase Cloud Messaging (FCM) provides a reliable and battery-efficient connection between your server and devices that allows you to deliver and receive messages and notifications on iOS, Android, and the web at no cost.

How often do FCM tokens change?

To cover all cases, you should adopt a threshold for when you consider tokens stale; our recommendation is two months. Any token older than two months is likely to be an inactive device; an active device would have otherwise refreshed its token.

How can I check my FCM token?

Check the format of the registration token you pass to the server. Make sure it matches the registration token the client app receives from registering with Firebase Notifications. Do not truncate or add additional characters. Notice that I added in “ABC” , in the registration_ids parameter.

Is my Firebase token valid or not?

Verify ID tokens using the Firebase Admin SDK

If the provided ID token has the correct format, is not expired, and is properly signed, the method returns the decoded ID token. You can grab the uid of the user or device from the decoded token.

How can I store FCM token in database?

Step1: as soon as you get token in callback whether new or same try to save it localstorage. Step2: Call your REST API to save it to your server. it is upto you if you want to send unique user identifier along with the token.

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What is a registration token?

Each registration is issued with a registration token (or token). A token is used to authorise a user to amend or discharge a registration.