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  • FirebaseArrayIndexError

Composite type which includes both a FirebaseError object and an index which can be used to get the errored item.

var registrationTokens = [token1, token2, token3];
admin.messaging().subscribeToTopic(registrationTokens, 'topic-name')
  .then(function(response) {
    if (response.failureCount > 0) {
      console.log("Following devices unsucessfully subscribed to topic:");
      response.errors.forEach(function(error) {
        var invalidToken = registrationTokens[error.index];
        console.log(invalidToken, error.error);
    } else {
      console.log("All devices successfully subscribed to topic:", response);
  .catch(function(error) {
    console.log("Error subscribing to topic:", error);