Can't see the JSON result of a Get request in postman and shows empty string array - json

Question

I have an ASP.NET CORE application that sends a POST/GET request to a REST (Orthanc Rest API). The issue is I receive the result and convert it to a JSON, but postman shows as an empty array. here is my code:
// GET Method
public class PACSController : ControllerBase
{
// GET: api/PACS
[HttpGet]
public async Task<object> Get()
{
var result = await Orthanc.Orthanc.InstanceAsync();
return result;
}
}
public class Orthanc
{
public static string baseUrl = "https://demo.orthanc-server.com/";
public static async Task<object> InstanceAsync()
{
string url = baseUrl + "instances";
using (HttpClient client = new HttpClient())
using (HttpResponseMessage res = await client.GetAsync(url))
using (HttpContent content = res.Content)
{
string data = await content.ReadAsStringAsync();
if (data != null)
{
Console.WriteLine(data);
}
var jData = JsonConvert.DeserializeObject(new string[] { data }[0]);
return jData;
}
}
}
The result of request inside the code
Postman result

Answer 1

As part of the work to improve the ASP.NET Core shared framework, Newtonsoft.Json has been removed from the ASP.NET Core shared framework for asp.net core 3.x.
Follow the steps:
Install the Microsoft.AspNetCore.Mvc.NewtonsoftJson package on nuget.
Install-Package Microsoft.AspNetCore.Mvc.NewtonsoftJson
Update Startup.ConfigureServices to call AddNewtonsoftJson.
services.AddControllersWithViews().AddNewtonsoftJson();
Reference:
https://learn.microsoft.com/en-us/aspnet/core/migration/22-to-30?view=aspnetcore-3.1&tabs=visual-studio#use-newtonsoftjson-in-an-aspnet-core-30-mvc-project