Rate Limiting
Controlling how many requests a client can make in a given time window. Protects your API from abuse and ensures fair usage.
What is Rate Limiting?
Controlling how many requests a client can make in a given time window. Protects your API from abuse and ensures fair usage.
Rate Limiting is a intermediate-level concept that sits in the Security Architecture area of system design. Engineers reach for it whenever they need to reason about real-world trade-offs in that space — not just for textbook correctness, but because real production systems at companies like Netflix, Amazon, and Google make these decisions every day.
If you want to go deeper than this definition — with diagrams, code, and a quiz to lock it in — work through the "Rate Limiting" lesson linked below. It walks through the why, the mechanism, the trade-offs, and how the giants actually use it in production.
Learn Rate Limiting in depth
Full interactive lesson with diagrams, code examples, real-world references, and a quiz.
Open the Rate Limiting lessonRelated lessons
Lessons that touch on Rate Limiting as part of a larger topic.
Rate Limiting
Protect your API from abuse and overload by controlling how many requests each consumer can make
intermediate · api design protocols
API Rate Limiting
Putting it all together, designing rate limiting for production APIs at scale
intermediate · api design protocols
Design a Rate Limiter
Design a distributed rate limiting system - token bucket, sliding window, and protecting services at massive scale
capstone · capstone
API Gateway
Centralized entry point that handles authentication, rate limiting, routing, and request transformation for microservices
foundation · load balancing proxies
Token Bucket Algorithm
A bucket of tokens that refills at a steady rate, the most popular rate limiting algorithm in production
intermediate · api design protocols
See also
Related glossary terms you might want to look up next.
Throttling
Slowing down the rate of processing requests instead of rejecting them outright. The gentler cousin of rate limiting.
API Gateway
A single entry point for all client requests that routes them to the appropriate microservice. Handles auth, rate limiting, and request transformation.
Redis
An in-memory data store used as a cache, message broker, and database. Blazing fast because everything lives in RAM.