What is wrong with this Json array syntax?

Question

I am sending a web request to Firebase Cloud Messaging to send a message. The raw data as sent with Content-Type:application/json" is:

{ "to":"ecO8y..._D", "data": [ {"msisdn":"+1111111" }, {"b":"c"} ] }

Firebase responds with this error message:

Field "data" must be a JSON array: [{"msisdn":"+1111111"},{"b":"c"}]

Is there something wrong with the text that I have entered for the data field?

Frank van Puffelen · Accepted Answer · 2017-09-07 13:59:59Z

1

I think the "JSON array" wording is confusing here. The data needs to be a JSON object with a single level of properties, so:

{
  "to":"ecO8y..._D", 
  "data": {
    "msisdn":"+1111111", 
    "b":"c"
  }
}

answered Sep 7, 2017 at 13:59

Frank van Puffelen

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1 Comment

Arnav Rao Over a year ago

Yes, data can't have hierarchical data or array of elements. It can contain only one level child elements.

Arnav Rao · Accepted Answer · 2017-12-12 17:50:20Z

0

When you try to send data from your application server to FCM, you will get 400 error, if data element contains hierarchical data or array of elements.

Data with one level of child element works.

{"message":{"topic":"users","data":{"name":"srao","pho":"38743"}}}

Data with array of element doesn't work.

{"message":{"topic":"users","data":[{"name":"grag","pho":"38743"},{"name":"boney","pho":"3899943"}]}}

Data with multiple levels or hierarchy doesn't work.

 {"message":{"topic":"users","data": {"person" : {"name":"srao","pho":"38743"}}}}

answered Dec 12, 2017 at 17:50

Arnav Rao

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