CODEWITHSUNDEEP
node.jsfirebasefirebase-cloud-messagingbackend
Vishal Kumar
Vishal Kumar

Reputation: 69

Sending topic notifications using firebase-admin

I need to implement broadcast notification through topics in fcm. I am using firebase-admin to send these. can anyone post the snippet of code to send these notifications through node.js?

Upvotes: 1

Views: 4067

Answers (4)

ulebule
ulebule

Reputation: 1

Be aware also of this "topic limitations" when sending topic messages:

Topic messaging supports unlimited subscriptions for each topic.

However, FCM enforces limits in these areas:

  • One app instance can be subscribed to no more than 2000 topics.
  • If you are using batch import to subscribe app instances, each request is limited to 1000 app instances.

The frequency of new subscriptions is rate-limited per project.

If you send too many subscription requests in a short period of time, FCM servers will respond with a 429 RESOURCE_EXHAUSTED ("quota exceeded") response. Retry with exponential backoff.

Source: FCM documentation.

Upvotes: 0

Dian
Dian

Reputation: 49

    const topic = "test";
    const payload = {
      notification: {
        title: "New news",
        body: "2:45",
      },
    };
    admin
      .messaging()
      .sendToTopic(topic, payload)
      .then((response2) => {
        // Response2 is a message ID string.
        console.log("Successfully sent message:", response2);
      })
      .catch((error) => {
        console.log("Error sending message:", error);
      });

Upvotes: 2

Mohak Gupta
Mohak Gupta

Reputation: 193

First you need to subscribe the user to the given topic

// These registration tokens come from the client FCM SDKs.
var registrationTokens = [
   'YOUR_REGISTRATION_TOKEN_1',
  // ...
   'YOUR_REGISTRATION_TOKEN_n'
];

// Subscribe the devices corresponding to the registration tokens to the
// topic.
admin.messaging().subscribeToTopic(registrationTokens, topic)
  .then(function(response) {
    // See the MessagingTopicManagementResponse reference documentation
    // for the contents of response.
    console.log('Successfully subscribed to topic:', response);
  })
  .catch(function(error) {
    console.log('Error subscribing to topic:', error);
  });

Then you can broadcast the notification using

// The topic name can be optionally prefixed with "/topics/".
var topic = 'highScores';

var message = {
  data: {
    score: '850',
    time: '2:45'
  },
  topic: topic
};

// Send a message to devices subscribed to the provided topic.
admin.messaging().send(message)
  .then((response) => {
    // Response is a message ID string.
    console.log('Successfully sent message:', response);
  })
  .catch((error) => {
    console.log('Error sending message:', error);
  });

You can read more about it here

Upvotes: 1

Akshay Kokadwar
Akshay Kokadwar

Reputation: 1

you will need Firebase project device registration tokens firebase cloud function

working of firebase notification : device to device notification : from device 1 - firebase database(function triggers on writes to Database) -firebase cloud function (the cloud function will send notification to dev 2)- device2

Upvotes: 0

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