Program.cs

using MongoDB.Bson.Serialization;
using MongoDB.Bson.Serialization.Serializers;
using MongoDB.Driver;
using Notepad.Controllers;
using Notepad.Helpers;
using Notepad.Interface;
using Notepad.Repository;
using Notepad.Settings;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers(options =>
{
    options.SuppressAsyncSuffixInActionNames = false;
});

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

BsonSerializer.RegisterSerializer(new GuidSerializer(MongoDB.Bson.BsonType.String));
BsonSerializer.RegisterSerializer(new DateTimeOffsetSerializer(MongoDB.Bson.BsonType.String));
builder.Services.AddSingleton<IUserActions, UserRepository>();
builder.Services.AddSingleton<INoteActions, NoteRepository>();
builder.Services.AddSingleton<IJwtService, JwtService>();
builder.Services.AddSingleton<IMongoClient>(ServiceProvider =>
{
    var settings = builder.Configuration.GetSection(nameof(MongoDbSettings)).Get<MongoDbSettings>();
    return new MongoClient(settings.ConnectionString);
});

var app = builder.Build();

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

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();