I got a very simple controller that reads json from a local file, parses it into a JObject with JObjects.parse, and then returns it with Ok().

The result shows the JSON, however the values are "empty"

The code

The result

The test JSON i’m using

{
    "version": "1.3",
    "status": "ok"
}

If I add a breakpoint, the response variable seems to be correctly filled:
Breakpoint

Does anyone have any clue what could be the issue here?

>Solution :

ASP.NET Core for several versions (since 3rd version if I remember correctly) now uses System.Text.Json as default serializer, which knows nothing about JObject from Newtonsoft one. You need to either switch to Newtonsoft Json (see here for example) – add Microsoft.AspNetCore.Mvc.NewtonsoftJson nuget and use AddNewtonsoftJson (for example services.AddControllers().AddNewtonsoftJson();)

Or use System.Text.Json capabilities for example JsonNode API (available since .NET 6).