Unexpected parsing error from Python server ArgumentException: JSON must represent an object type.

Unity Engine
,
1

Having a problem trying to parse a Json object returned from my Python server.
The error I am getting is
“ArgumentException: JSON must represent an object type.”

The puzzling thing is if I take the exact string returned from the server and hard code it before passing it to the parsing method Player.CreateFromJSON it works!

These are the 3 relevant lines in the Python server

     x = '{"playerId":8484239823,"playerLoc":"Powai","playerNick":"Random Nick"}'
     y = json.dumps(x)
     socket.send_string(y)

This is the JSON string returned.

    "{\"playerId\":8484239823,\"playerLoc\":\"Powai\",\"playerNick\":\"Random Nick\"}"

This is my Player object taken from the documentation Unity - Scripting API: JsonUtility.FromJson

[System.Serializable]
    public class Player
    {
        public string playerId;
        public string playerLoc;
        public string playerNick;
 
        public static Player CreateFromJSON(string jsonString)
        {
            return JsonUtility.FromJson<Player>(jsonString);
        }
    }

Am using Unity’s native JsonUtility FromJson method as can be seen from above and I simply call

    Player playerInfo = Player.CreateFromJSON(jsonStringFromServer);

to populate the Player object

Have spent countless hours googling and trying to find similar issues. Any feedback or troubleshooting steps welcome!

2

The escape backslashes are not valid JSON. That might just be how you printed it, not sure.

To see valid JSON, drop any JSON you want into this: https://jsonlint.com

You probably just need a de-escape step.

3

I think your python code is wrong.

     x = '{"playerId":8484239823,"playerLoc":"Powai","playerNick":"Random Nick"}'
     y = json.dumps(x)
     socket.send_string(y)

You’re taking an already-encoded json string, and then you’re json-encoding that. That’s why your server is producing escape sequences. It’s treating your actual json like a literal string inside a json payload. I think if you just get rid of the json.dumpscall it will work properly. But you will need json.dumps if you are starting not with a string but an actual structured object in Python.