FCM Field "data" must be a JSON array - arrays

Question

Hi im working with postman to make my json object FCM message:
But when i try to send:
{
"to":"fzvihT7dFUI:APA91bFVhnWAxXVjlWiiHIs9ZUyL1DE2hZO6GpItJtReh3hcKF1kD6mLuQq9fNP9xvS5bOFWUOG-OW-uyOedc1C43m8jfvD4OOfsBYuMbM7t1-dZEy2kQcuv3gJw6dhneVus2AR_hQHQ",
"data":[
{
"time":1501385514224,
"CC":"1030626890"
}
],
"notification":{
"body":"SPO2:95 \nPulso:75",
"title":"El paciente Daniel Ortiz nesecita asistencia"
}
}
The response its:
Field "data" must be a JSON array:
[{"CC":"1030626890","time":1501385514224}]
But i know the [{"CC":"1030626890","time":1501385514224}] its a array, i dont understand the problem.
What i made wrong?

Answer 1

From the Firebase Cloud Messaging documentation, it seems like data should be a JSON object:
{
"to" : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
"data" : {
"Nick" : "Mario",
"body" : "great match!",
"Room" : "PortugalVSDenmark"
},
}
I'm not sure why the error message talks says it needs to be an array. It's like meant as an "associative array" which is really just another term for a JSON object.

Answer 2

I might be too late but for those who still face this problem , following change saved me.
By adding JSON_FORCE_OBJECT to json_encode() it will add missing braces so it should be something like this:
json_encode($fields ,JSON_FORCE_OBJECT));
That's it.

Answer 3

In case you serialize sql/api results data that each item of the array has a numeric key using php, for example an array like:
$results = [
['name'=>'john', 'durname'=>'doe'],
['chuck'=>'john', 'durname'=>'Norris'],
]
Before turning into FCM data try:
$results = [
["time":1501385514224, "CC":"1030626890"]
["time":1501385514334, "CC":"1030126890"]
]
$fcmData = [
"to"=>"fzvihT7dFUI:APA91bFVhnWAxXVjlWiiHIs9ZUyL1DE2hZO6GpItJtReh3hcKF1kD6mLuQq9fNP9xvS5bOFWUOG-OW-uyOedc1C43m8jfvD4OOfsBYuMbM7t1-dZEy2kQcuv3gJw6dhneVus2AR_hQHQ",
"data":[
"data" => $results
],
"notification" => [
"body"=>"SPO2:95 \nPulso:75",
"title"=>"El paciente Daniel Ortiz nesecita asistencia"
]
]
$fcmData = json_encode($fcmData);
// Send push notification here
In case you are using laravel with brozot/laravel-fcm, a good approach is this one.
Thje bottom line is that fcm/push notification data MUST be an associative array.