study-lib-backend/API/Controllers/UserProfilesController.cs

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using StudyLib.API.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace StudyLib.API.Controllers
{
    [Route("api/[controller]")]
    [Authorize]
    [ApiController]
    public class UserProfilesController : ControllerBase
    {
        private UserManager<User> _userManager;

        public UserProfilesController(UserManager<User> userManager)
        {
            _userManager = userManager;
        }

        [HttpGet]
        [Authorize]
        public async Task<User> GetUserProfile()
        {
            string userId = User.Claims.First(c => c.Type == "UserID").Value;
            var user = await _userManager.FindByIdAsync(userId);
            return user;
        }
    }
}