CSharp-Coder

Learn API security best practices for 2026 with runnable C# and ASP.NET Core examples — JWT, rate limiting, BOLA fixes. Start hardening your REST API today. If you ship a REST API in 2026, you are running a public attack surface. Attackers no longer bother with your UI — they read your OpenAPI document, enumerate your endpoints, and hammer them directly. This guide covers the API security best practices that actually matter today, with runnable C# and ASP.NET Core examples you can drop into a real project. We will focus on the failures that show up in genuine breach reports: broken object-level authorization, weak token validation, missing rate limits, and secrets sitting in source control. Every example targets ASP.NET Core on .NET 8 or later, and each one explains why the control exists — because a security rule you do not understand is a security rule you will disable the first time it breaks a deployment. Why REST API Security Fails: The OWASP API Security Top 10 The OW...