Getting invalid json primative

Question

Hey I am having a weird issue I can't figure out. Basically I am trying to make a simple httpClient post request but I keep getting an "Invalid json primitive:." I have checked on https://jsonlint.com/ and it says this is valid json but my application states otherwise. Any info would be greatly appreciated?

string test = "{\"CurrentUser\":null,\"Stacktrace\":\"System.UnhandledExceptionEventArgs\",\"OtherData\":null,\"UserInput\":\"\",\"TimeStamp\":\"2017-10-10T16:48:58.606512-04:00\"}"

 HttpContent httpContent = new StringContent(test);
 await httpClient.PostAsync("/api/logException", httpContent);

And the client is initialized like:

 httpClient = new HttpClient();
 httpClient.BaseAddress = new Uri(this.serverURL);
 httpClient.Timeout = TimeSpan.FromSeconds(400);

Done but I don't think there's anything special going on here. I can actually do other post requests but this specific one seems to be the issue. If it helps this is for logging unhandled exceptions to a database — Seamy, Oct 10 '17 at 21:20
Just built and ran this, and everything seems to be working fine. I think the problem should be somewhere deeper in your configuration. — Tomas Smagurauskas, Oct 10 '17 at 21:23
Can you look into the `/api/logException` endpoint? Also, it will be helpful if you can post full exception details, like the error message and stack trace. — TheVillageIdiot, Oct 10 '17 at 21:50

Sparsha Bhattarai · Answer 1 · 2018-03-09T15:56:49.907

Instead of writing the JSON format on your own (which is prone to error), how about you simply create an object and serialize it to JSON. Have c# do the heavy lifting. First create a class like:

public class Model
{
   public string CurrentUser { get; set; } = null;
   public string Stacktrace { get; set; } = "System.UnhandledExceptionEventArgs";
   public string UserInput { get; set; } = String.Empty;
   public string OtherData { get; set; } = null;
   public string TimeStamp { get; set; } = "2017-10-10T16:48:58.606512-04:00";
}

Then initialize an object of this class and simply use JavaScriptSerializer to serialize it into json:

Model md = new Model();
System.Web.Script.Serialization.JavaScriptSerializer ser = new System.Web.Script.Serialization.JavaScriptSerializer();
var json = ser.Serialize(md);

The result will be in json:

{"CurrentUser":null,"Stacktrace":"System.UnhandledExceptionEventArgs","UserInput":"","OtherData":null,"TimeStamp":"2017-10-10T16:48:58.606512-04:00"}

score 0 · Answer 2 · answered Oct 10 '17 at 21:13

0

I'm no expert, but since nobody else has responded, perhaps you just need to set the content type to JSON?

HttpContent httpContent = new StringContent(test, Encoding.UTF8, "application/json");

See POSTing JsonObject With HttpClient From Web API

answered Oct 10 '17 at 21:13

Kudu2

56
2
7

I tried that as well thinking the same but no luck either. – Seamy Oct 10 '17 at 21:16

score 0 · Answer 3 · answered Oct 10 '17 at 23:27

0

Try to String.Replace("\", string.Empty) to your json. Perhaps this will work.

answered Oct 10 '17 at 23:27

Mikhail Efremov

101
3

score 0 · Accepted Answer · answered Oct 11 '17 at 16:12

Hey thanks for the answers. You are all correct and I appreciate the help. The issue was in the end not actually json. Basically this error was propagating and actually appearing twice after I thinking it was handled. So where I thought it was telling me invalid json existed (where it was breaking) was actually it repeating the same error message from further up the code.

Thanks again.

Getting invalid json primative

4 Answers4