MassTransit

Overview

MassTransit is a mature, open-source distributed application framework for .NET that provides a consistent abstraction over message transports (RabbitMQ, Azure Service Bus, Amazon SQS, ActiveMQ, and in-memory). It handles message routing, serialization, consumer lifecycle, retry policies, saga state machines, and transactional outbox patterns. MassTransit integrates natively with Microsoft.Extensions.DependencyInjection and ASP.NET Core.

NuGet Packages

• MassTransit -- core library with in-memory transport
• MassTransit.RabbitMQ -- RabbitMQ transport
• MassTransit.Azure.ServiceBus.Core -- Azure Service Bus transport
• MassTransit.AmazonSQS -- Amazon SQS/SNS transport
• MassTransit.EntityFrameworkCore -- EF Core saga persistence and outbox
• MassTransit.MongoDb -- MongoDB saga persistence

Basic Setup

using MassTransit;

var builder = WebApplication.CreateBuilder(args);