The Simplest Way to Add Keycloak Authentication to Your .NET API

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Learn how to secure your .NET API with Keycloak authentication in the most straightforward way possible with the help of .NET Aspire. In this tutorial, I'll show you how to integrate Keycloak JWT bearer authentication into your ASP.NET application with just a few lines of code. No complicated setup or confusing configuration files - just clean, simple implementation that you can add to your project today. Whether you're building a new API or adding security to an existing one, this guide will help you implement robust authentication without the usual headaches.

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Chapters

0:00 The app we're using

1:06 Adding the Keycloak service

3:06 Configuring Keycloak realm

5:20 Getting an access token (JWT)

6:46 Adding Authentication in API

9:54 Understanding backchannel auth

11:14 Examining distributed traces