How to Build a Clean ASP.NET Core API Using Signalynx and CQRS Pattern

A tutorial published on DEV Community demonstrates how to build a cleaner ASP.NET Core API by applying the Mediator pattern through a library called Signalynx. As ASP.NET Core controllers grow, they often accumulate validation, business logic, and error handling, making them harder to test and maintain. The Mediator pattern addresses this by having controllers dispatch strongly typed messages to dedicated handlers, keeping HTTP concerns separate from application logic. Signalynx supports commands, queries, notifications, pipeline behaviors, and dependency injection for modern .NET applications. The guide walks developers through creating a new Web API project, installing the Signalynx.DependencyInjection package, and wiring up a POST command endpoint and a GET query endpoint.