Program.cs

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Rewrite;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;
using System.Text;

const string CorsPolicyName = "_APIPolicy";

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddCors(o => o.AddPolicy(name: CorsPolicyName, builder => builder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod()));

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = false, // This will allow an expired token to be parsed
            ValidateIssuerSigningKey = true,
            ValidIssuer = builder.Configuration["Jwt:Issuer"],
            ValidAudience = builder.Configuration["Jwt:Audience"],
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Key"] ?? string.Empty))
        };
    });

builder.Services.AddAuthorization();

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
// Add Swagger
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo { Title = ".Net Core API", Version = "v1" });

    // Add JWT token configuration
    c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
    {
        Description = "JWT Authorization header using the Bearer scheme",
        Type = SecuritySchemeType.Http,
        Scheme = "bearer"
    });

    // Add a requirement for the token
    c.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type = ReferenceType.SecurityScheme,
                    Id = "Bearer"
                }
            },
            Array.Empty<string>()
        }
    });
});

var app = builder.Build();

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

var option = new RewriteOptions();
option.AddRedirect("^$", "swagger");
app.UseRewriter(option);

app.UseHttpsRedirection();

app.UseCors(CorsPolicyName);

app.UseAuthorization();

app.MapControllers();

app.Run();