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Learn ASP.NET Core rate limiting with fixed window, sliding window, token bucket and concurrency limiters. Runnable C# examples — secure your API today. If your API is public, it will get hammered — by bots, by misconfigured clients stuck in retry loops, and occasionally by someone actively trying to knock it over. ASP.NET Core rate limiting is the built-in defense for this. Since .NET 7, the Microsoft.AspNetCore.RateLimiting middleware ships in the framework, and in 2026 with .NET 9 and .NET 10 it's mature, fast, and flexible enough that you no longer need a third-party package for most scenarios. In this guide you'll learn what rate limiting actually protects you from, how the four built-in algorithms differ (and which one to choose), and how to wire up a production-ready configuration with per-user partitions, proper 429 responses, and the pitfalls that trip up most teams. Why Rate Limiting Matters for API Security Rate limiting caps how many requests a client can...

Learn ASP.NET Core rate limiting with built-in .NET middleware. Fixed window, sliding window, token bucket & code examples. Secure your API today! If your API is public, it will be abused — by scrapers, misconfigured clients stuck in retry loops, brute-force login bots, or a single power user hammering an expensive endpoint. ASP.NET Core rate limiting is the first line of defense, and since .NET 7 it has been built directly into the framework via the Microsoft.AspNetCore.RateLimiting middleware — no third-party packages required. In this tutorial you'll learn how to configure all four built-in rate limiting algorithms in .NET 8, 9, and 10, how to apply limits per user or per IP address, how to return proper 429 Too Many Requests responses, and the pitfalls that trip up production deployments (especially behind load balancers). Why Rate Limiting Matters in 2026 Rate limiting is not just a security checkbox. It solves several distinct problems, and knowing which pro...