TMD-MQTT/MQTT-Broker/Controllers/TestAPIController.cs

using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace MQTT_Broker.Controllers
{ //[Authorize]
    [Route("api/[controller]")]
    [ApiController]
    public class TestAPIController
    {
        [HttpGet("aa")]
        public IActionResult Get()
        {
            return new JsonResult(new { a = "aa", c = "bb" });
        }
    }

}