FCM Data messages: need to send JSON array in place of String value

Question

As per firebace doc, we can send FCM data messages in below format:

{
"message":{
"token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMEFQ3P1...",
"data":{
  "Nick" : "Mario",
  "body" : "great match!",
  "Room" : "PortugalVSDenmark"
}
}
}

But, I am required to send data as JSON Array like below:

{
"message":{
"token":"bk3RNwTe3H0:CI2k_HHwgIpoIZvvDMExUdFQ3P1...",
"data":{
       "geofence":[{
                     "Nick" : "Mario",
                     "body" : "great match!",
                    "Room" : "PortugalVSDenmark"
                    },
                    {
                    "Nick" : "Mario",
                    "body" : "great match!",
                    "Room" : "PortugalVSDenmark"
                    }]
}
}
}

I am getting below error if I try to send JSON Array in request body for sending messages:

Unable to send message to Firebase:

  {  "error": 
   {    "code": 400,    
"message": "Invalid value at 'message.data[0].value' (Map), Cannot have repeated items ('geofence') within a map.\nInvalid JSON payload received. Unknown name \"\" at 'message.data[0].value': Proto fields must have a name.",    
"status": "INVALID_ARGUMENT",    
"details": [      {        "@type": "type.googleapis.com/google.rpc.BadRequest",        "fieldViolations": [          {            "field": "message.data[0].value",            "description": "Invalid value at 'message.data[0].value' (Map), Cannot have repeated items ('geofence') within a map."          },          {            "field": "message.data[0].value",            "description": "Invalid JSON payload received. Unknown name \"\" at 'message.data[0].value': Proto fields must have a name."          }        ]      }    ]  
}}

Android code is expecting data in JSON Array format not in String. I am stucked here badly.

Any help will be highly appreciated.

Are you sure that error matches the payload you're sending? The error mentions repeated "geofence" items, but your payload doesn't mention that at all. — Doug Stevenson, Dec 19 '18 at 06:33
@DougStevenson geofence is CUSTOM_KEY nothing else. I've corrected JSON key. — S Singh, Dec 19 '18 at 06:55
@SSingh I got solution : Hope it will help you some how: https://stackoverflow.com/a/55428420/1318946 — Pratik Butani, Mar 30 '19 at 05:24

score 9 · Accepted Answer · answered Dec 19 '18 at 07:14

9

The values in the data payload must be strings. You can't have arrays or objects. Your geofence is an array.

You can see from the Android API for RemoteMessage.getData() that the return type is Map<String, String>, which implies that you can only have string values. You can see also in the protocol docs that the data payload is string keys mapped to string values. So, you're going to have to figure out a way to flatten your data to strings.

answered Dec 19 '18 at 07:14

Doug Stevenson

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You are right. Now I have sent JSONArray as String and its successfully sent data to android device. – S Singh Dec 21 '18 at 09:48
1

@SSingh how did you solved it? here I have [Question](https://stackoverflow.com/questions/55417458/parse-nested-json-array-from-notification-data-using-gson-in-android) – Pratik Butani Mar 29 '19 at 13:07

score 2 · Answer 2 · edited Sep 23 '21 at 16:36

2

If you are using JavaScript, you can use JSON.stringify(object) and, at the receiver, end you can use JSON.parse(stringObject).

edited Sep 23 '21 at 16:36

Adrian Mole

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answered Sep 23 '21 at 12:37

Vimal Swaroop J

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FCM Data messages: need to send JSON array in place of String value

2 Answers2