Program.cs

using JwtPractice.Data;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.OpenApi.Models;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection")));

builder.Services.AddScoped<JwtPractice.Services.JwtService>();

builder.Services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
}).AddJwtBearer(options =>
{
    options.RequireHttpsMetadata = false;
    options.SaveToken = true;
    options.TokenValidationParameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidIssuer = builder.Configuration["JwtConfig:Issuer"],
        ValidAudience = builder.Configuration["JwtConfig:Audience"],
        IssuerSigningKey = new Microsoft.IdentityModel.Tokens.SymmetricSecurityKey(System.Text.Encoding.UTF8.GetBytes(builder.Configuration["JwtConfig:Key"]))
    };
});

builder.Services.AddAuthorization();

builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(options =>
{
    var jwtSecurityScheme = new OpenApiSecurityScheme
    {
        BearerFormat = "JWT",
        Name = "Authorization",
        In = ParameterLocation.Header,
        Type = SecuritySchemeType.Http,
        Scheme = JwtBearerDefaults.AuthenticationScheme,
        Description = "Enter your JWT Access Token",
        Reference = new OpenApiReference
        {
            Id = JwtBearerDefaults.AuthenticationScheme,
            Type = ReferenceType.SecurityScheme
        }
    };

    options.AddSecurityDefinition("Bearer", jwtSecurityScheme);
    options.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        {jwtSecurityScheme, Array.Empty<string>() }
    });
});

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthentication();
app.UseAuthorization();

app.MapControllers();

app.Run();