c# - Valid JSON string throws Unexpected character encountered error -

i'm trying connect angular2 client c# asp.net core server. when i'm sending json string using websockets client server, error:

unexpected character encountered while parsing value: {. path 'argument', line 1, position 39.

the json string follows (the error seems originate opening bracket after "argument:"):

{   "methodname": "createuser",   "argument": {      "user": {       "attributes": [{         "name": "age",         "value": "30",         "type": 0       }],       "email": "test@mail.com",       "name": "test name"     },     "password": "1234"   } } 

the code throws error here:

public string receive(string input)     {         try         {             debug.writeline(input);             instructionserver jsonobject = jsonconvert.deserializeobject<instructionserver>(input); // fails             string methodname = jsonobject.methodname;             string data = jsonobject.argument;             return methods[methodname](1, data, "", "");         }         catch (exception e)         {             return "error: " + e.message;         }      } 

i can't seem figure out error is, because when throw json online json formatter, reports valid json. appreciated.

edit: clarify on valid json. tried printing json string out before sending on client , after receiving on server, , same json string written above.

argument appears expecting string, found object. you'll have check format instructionserver expecting , ensure able deserialize correctly.