Program.cs

using Microsoft.OpenApi.Models;
using Scalar.AspNetCore;

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();

builder.Services.AddSwaggerGen(opt => 
{
    opt.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
    {
        BearerFormat = "JWT",
        Description = "JWT Authorization header using the Bearer scheme.",
        Name = "Authorization",
        In = ParameterLocation.Header,
        Type = SecuritySchemeType.Http,
        Scheme = "Bearer"
    });
    opt.AddSecurityRequirement(new OpenApiSecurityRequirement
            {
                {
                    new OpenApiSecurityScheme
                    {
                        Reference = new OpenApiReference
                        {
                            Id = "Bearer",
                            Type = ReferenceType.SecurityScheme
                        }
                    },
                    Array.Empty<string>()
                }
            });
});

var app = builder.Build();

app.UseSwagger(opt =>
{
    opt.RouteTemplate = "openapi/{documentName}.json";
});
app.MapScalarApiReference(opt =>
{
    opt.Title = "Scalar Example";
    opt.Theme = ScalarTheme.Mars;
    opt.DefaultHttpClient = new(ScalarTarget.Http, ScalarClient.Http11);
});

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();