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title: CQRS Kommand in ASP.NET Core | daily.dev
description: Kommand is a free, open-source, lightweight .NET library for implementing CQRS with a mediator pattern, positioned as an alternative now that MediatR is no...
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# CQRS Kommand in ASP.NET Core

**[NikolaTech](https://daily.dev/sources/nikolatech)** · 4 min read · 0 upvotes · 0 comments

## Summary

Kommand is a free, open-source, lightweight .NET library for implementing CQRS with a mediator pattern, positioned as an alternative now that MediatR is no longer free. It explains CQRS basics (separating commands and queries), then walks through installing the pre-release NuGet package, defining commands/queries and their handlers, registering Kommand, wiring up minimal API endpoints, adding built-in validation with dependency injection support, and using type-specific interceptors (global, command, and query) for cross-cutting concerns like logging. The library also supports pub/sub and built-in observability, originally built internally at Atherio before being open-sourced.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://nikolatech.net/blogs/cqrs-kommand-aspnet-core>

## Questions this post answers

### What is the Kommand library for CQRS in .NET and how is it different from MediatR?

Kommand is a free, open-source, lightweight .NET library for implementing CQRS and the mediator pattern, built by Atherio for internal production use before being open-sourced. Unlike MediatR, which is no longer free, Kommand provides commands and queries with separate handler interfaces, built-in validation with dependency injection support, and type-specific interceptors for cross-cutting concerns like logging, plus pub/sub and observability features.

_Developers evaluating MediatR alternatives can track new CQRS tooling like Kommand on daily.dev._

### How do you dispatch commands and queries separately using IMediator in a .NET minimal API?

Use IMediator's SendAsync method for commands and QueryAsync for queries, which makes the read/write intent explicit in minimal API endpoints. A command is mapped with app.MapPost calling mediator.SendAsync(command, cancellationToken), while a query is mapped with app.MapGet calling mediator.QueryAsync(request, cancellationToken), each returning Results.Ok with the response.

_Developers structuring CQRS endpoints in ASP.NET Core can find implementation patterns like this on daily.dev._

### How do you add validation that depends on a database or external service in a CQRS command handler?

Kommand supports validators implementing IValidator that run before the command handler and support dependency injection, so validation logic can query a database or call external services rather than just checking request properties. Validators return a ValidationResult built from a list of ValidationError objects, and validation is enabled by calling config.WithValidation() during service registration.

_Developers building validation pipelines for commands can explore patterns like this on daily.dev._

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