Web API JSON string result contains double quotes around value for dynamic object -

my controller follows...

public ihttpactionresult getdata()     {        ienumerable<dynamic> result = api.getdata();         string json = jsonconvert.serializeobject(result);        return ok(json); } 

returns raw text fiddler

{"@odata.context":"https://localhost:44305/api/$metadata#edm.string","value":"[\r\n {\r\n \"username\": \"test@gmail.com\"\r\n }\r\n]"

you notice json object value has double quotes around , special characters \r\n. how return pure json format???

i not getting more details code have tried way. there specific reason use serialized object?

        [system.web.http.httpget]                          public ienumerable<xyz> getdata()          {              return api.getdata();          }

hope helps!!!