Firebase admin SDK FCM error Exactly one of topic, token or condition is required

Question

I am fixing an error message which occurred, but it also used to work before. I am sending FCM notification with multiple tokens and am getting the following error

0|api      | 2020-2-11 13:26:26   [ExceptionsHandler] Exactly one of topic, token or condition is required
0|api      |  +542752ms
0|api      | Error: Exactly one of topic, token or condition is required
0|api      |     at FirebaseMessagingError.FirebaseError [as constructor] (/var/www/tokee-api-new/node_modules/firebase-admin/lib/utils/error.js:42:28)
0|api      |     at FirebaseMessagingError.PrefixedFirebaseError [as constructor] (/var/www/tokee-api-new/node_modules/firebase-admin/lib/utils/error.js:88:28)
0|api      |     at new FirebaseMessagingError (/var/www/tokee-api-new/node_modules/firebase-admin/lib/utils/error.js:254:16)        0|api      |     at Object.validateMessage (/var/www/tokee-api-new/node_modules/firebase-admin/lib/messaging/messaging-types.js:46:15)
0|api      |     at /var/www/tokee-api-new/node_modules/firebase-admin/lib/messaging/messaging.js:265:31
0|api      |     at Array.map (<anonymous>)
0|api      |     at Messaging.sendAll (/var/www/tokee-api-new/node_modules/firebase-admin/lib/messaging/messaging.js:264:29)
0|api      |     at Messaging.sendMulticast (/var/www/tokee-api-new/node_modules/firebase-admin/lib/messaging/messaging.js:313:21)   0|api      |     at userChunks.forEach.userChunk (/var/www/tokee-api-new/src/modules/common/firebase/firebase.service.ts:154:42)     0|api      |     at Array.forEach (<anonymous>)
0|api      |     at FCMService.<anonymous> (/var/www/tokee-api-new/src/modules/common/firebase/firebase.service.ts:142:16)
0|api      |     at Generator.next (<anonymous>)
0|api      |     at /var/www/tokee-api-new/dist/src/modules/common/firebase/firebase.service.js:13:71
0|api      |     at new Promise (<anonymous>)
0|api      |     at __awaiter (/var/www/tokee-api-new/dist/src/modules/common/firebase/firebase.service.js:9:12)
0|api      |     at FCMService.sendToMany (/var/www/tokee-api-new/dist/src/modules/common/firebase/firebase.service.js:123:16)       0|api      |     at AdminNotificationController.<anonymous> (/var/www/tokee-api-new/src/modules/notification/admin-notification.controller.ts:65:42)
0|api      |     at Generator.next (<anonymous>)
0|api      |     at fulfilled (/var/www/tokee-api-new/dist/src/modules/notification/admin-notification.controller.js:16:58)
0|api      |     at <anonymous>

The code producing the error:

async sendToMany(users: User[], notification: VSendNotification, title = 'Title', lowPriority = false) {
    // We split emails into arrays of max. 100 size because of the limitation with FCM
    const userChunks = _.chunk(users, 100);
    const promises = [];
    userChunks.forEach(userChunk => {
      const msg: admin.messaging.MulticastMessage = {
        notification: {
          title,
          body: notification.body
        },
        tokens: userChunk.map(user => user.firebaseToken),
        android: {
          priority: lowPriority ? 'normal' : 'high'
        }
      };
      promises.push(this.app.messaging().sendMulticast(msg));
    });
    const result = await Promise.all(promises);
    let accepted = 0;
    let rejected = 0;
    result.forEach(response => {
      accepted += response.successCount;
      rejected += response.failureCount;
    });

    return { accepted, rejected, notification };
  }
}

Thoughts on what could be wrong?

Same happening with me – Varad Mondkar Feb 11 '20 at 14:21 — Varad Mondkar, Feb 11 '20 at 14:21

score 29 · Accepted Answer · answered Feb 11 '20 at 14:51

29

Solution - Avoid sending empty fcm token to Firebase.

I got the solution. I listed all my firebase token and there were some empty tokens in my database which was the main problem.

When we send empty fcm token, Firebase gives us below error

Exactly one of topic, token or condition is required

answered Feb 11 '20 at 14:51

Varad Mondkar

1,441
1
18
29

2

Yeah, I think that's the answer. Our app had been through a rework and apparently some users' tokens got deleted. Checked and yeah, they were null :) – Pungiish Feb 11 '20 at 15:42
7

Same happening but I don't have empty fcm token – C-lio Garcia Dec 03 '20 at 00:50
Kindly check it once again, by printing every token. It could be empty or null. – Varad Mondkar Dec 03 '20 at 04:17
1

In my case, I was using send instead of sendMulticast – vijayst Sep 29 '21 at 03:51

score 6 · Answer 2 · answered Oct 04 '21 at 14:26

6

Like the comment mentioned by @vijayst. My Issue was that I was using send(message) and including in my message an array of tokens. However, send() doesn't accept that. Send could accept a "topic", but to send to an array of tokens, you need to use sendMulticast(message)

send

sendMulticast

answered Oct 04 '21 at 14:26

SeanMC

1,960
1
22
33

we have to use send, sendMulticast properly. https://firebase.google.com/docs/cloud-messaging/send-message – Mahesh K Oct 27 '21 at 05:36

Firebase admin SDK FCM error Exactly one of topic, token or condition is required

2 Answers2

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