Getting duplicate tokens for multiple users while utilizing Firebase messaging

When attempting to acquire a token from firebase, I employ the code snippet provided below:

const messaging = firebase.messaging();

messaging.requestPermission()
  .then(() =>{
    return firebase.messaging().getToken();
  }).then(token => {
     saveTokentoServer(user.uid, token);
  })

However, a recurring issue arises where I am receiving identical tokens for different users. Consequently, I am unable to send targeted messages.

Is there anyone who can provide guidance on obtaining distinct tokens for individual users?

After spending two days searching for solutions, I am perplexed as to why my web application is not generating unique tokens.

javascriptfirebasefirebase-cloud-messaging

Answer №1

Unique identifiers called Firebase Cloud Messaging tokens are used to identify installations of a mobile app on specific devices, rather than individual users. This means that if multiple users access the same app in a single browser profile, they will receive the same token.

I have not personally tested this method, but it may be possible to remove the token (such as when a user signs out), then proceed to request permission and obtain a new token for the subsequent user.

Answer №2

I have a different way to address your issue,

You can utilize topics for receiving notifications,

1.) Sign up for a topic using your registration_token, ensuring each user has a unique topic name like their user id. 

https://iid.googleapis.com/iid/v1/<REGISTRATION_TOKEN>/rel/topics/<TOPIC_NAME>

For instance:

https://iid.googleapis.com/iid/v1/nKctODamlM4:CKrh_PC8kIb7O...clJONHoA/rel/topics/movies
Content-Type:application/json
Authorization:key=AIzaSyZ-1u...0GBYzPu7Udno5aA

2.) Broadcast Notification to the specified topic

https://fcm.googleapis.com/fcm/send
Content-Type:application/json
Authorization:key=AIzaSyZ-1u...0GBYzPu7Udno5aA
{
  "to" : "/topics/movies",
  "priority" : "high",
  "notification" : {
    "body" : "This is a message through Firebase Cloud Messaging Topic!",
    "title" : "FCM Message",
  }
}

3.) Eliminate the registration_id from the topic upon logging out

https://iid.googleapis.com/iid/v1:batchRemove
Content-Type:application/json
Authorization:key=API_KEY
{
   "to": "/topics/movies",
   "registration_tokens": ["nKctODamlM4:CKrh_PC8kIb7O..."],
}

Substitute the topic name "movies" with the user's unique identifier such as their user id or email.

Answer №3

An alternative approach to addressing this issue is by introducing a new attribute named userId within the notification data being transmitted. On the recipient side, notifications should only be displayed if the userId matches the FirebaseAuth.user.id or an equivalent condition if a different authentication mechanism is in use.

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