API Gateway Architecture Diagram
Show how an API gateway routes, authenticates and rate-limits traffic to backend services.
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An API gateway architecture diagram illustrates the single entry point that sits between clients and backend services. The gateway handles routing, authentication, rate limiting, request transformation and response aggregation, then forwards calls to the right upstream services. Around it sit identity providers, backend microservices, a cache layer and observability tooling that the gateway integrates with.
Backend engineers, API platform teams and architects use this diagram to document edge traffic flow and security policies. It is the clearest way to show how clients reach internal services, where cross-cutting concerns like auth and throttling live, and how the gateway protects and decouples the backend from external consumers.
Great for
- API platform documentation
- Security policy reviews
- Edge architecture planning
- Engineering onboarding
- Vendor evaluation
Frequently asked questions
What is an API gateway?+
An API gateway is a single entry point that receives client requests, applies cross-cutting policies like authentication and rate limiting, and routes them to the correct backend services.
What does an API gateway do?+
It handles routing, authentication, rate limiting, request and response transformation, caching, and aggregation, so backend services do not have to implement these concerns individually.
What is the difference between an API gateway and a load balancer?+
A load balancer distributes traffic across identical servers, while an API gateway understands API requests and applies routing, security and transformation logic per endpoint.
Why use an API gateway?+
It centralizes security, monitoring and routing, decouples clients from internal services, and lets you change the backend without breaking external consumers.
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