1

I am using firebase javascript api v9 in my react project and i am using the code below as suggested by the oficial documentation



    import { getMessaging } from "firebase/messaging";
    
    // These registration tokens come from the client FCM SDKs.
    const registrationTokens = [
      'fcm_token_string'
    ];
    
    // Subscribe the devices corresponding to the registration tokens to the topic
    getMessaging().subscribeToTopic(registrationTokens, topic)
      .then((response) => {
        // See the MessagingTopicManagementResponse reference documentation [enter link description here][1]for the contents of response.
        console.log('Successfully subscribed to topic:', response);
      })
      .catch((error) => {
        console.log('Error subscribing to topic:', error);
      });

However, despite of doing exactly what the documation of firebase api v9 says, I am getting undefined when accessing getMessaging().subscribeToTopic function.

I am wondering if this function was moved to another component and the documentation has become outdated.

I would appreciate any help. Thank you in advance.

Frank van Puffelen
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Igor RMS
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1 Answers1

3

There is no way to subscribe a web client to a topic from within the client-side code (see How to subscribe to topics with web browser using Firebase Cloud Messaging). So that code you got from the documentation is supposed to run on the server, using the Firebase Admin SDK for Node.js, which still uses the namespaced ...subscribeToTopic() syntax.

Frank van Puffelen
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