API Gateway
An API Gateway is a single entry point that sits between client applications and backend services. It routes requests, enforces authentication and rate limits, transforms payloads, and aggregates responses so clients talk to one stable endpoint instead of many internal APIs.
Technical Architecture & Deep-Dive
As systems grow into many services and third-party integrations, letting every client call every backend directly creates duplicated auth logic, inconsistent error handling, and brittle coupling. An API gateway centralizes these cross-cutting concerns at one layer.
Traditional gateways run as clustered servers in a single cloud region, adding a network hop for distant users. Edge API gateways run on globally distributed runtimes like Cloudflare Workers, applying routing, secret injection, and response shaping within milliseconds of the user before forwarding to origins.
Key Architectural Benefits
Deploy an Edge API Gateway
Route, authenticate, and shape upstream APIs from one global endpoint with no servers to manage.
Frequently Asked Questions
Q:Is an API gateway the same as a Backend for Frontend?
No. An API gateway serves all clients with shared policies. A Backend for Frontend is a gateway tailored to one specific client experience, such as a mobile app, shaping data exactly for that interface.
Q:Do small apps need an API gateway?
Small apps benefit as soon as they call third-party APIs with secret keys. A lightweight edge gateway hides credentials and fixes CORS without running any servers.
Related Architecture Concepts
Backend for Frontend (BFF) is an architectural pattern where a dedicated gateway layer is created for a specific frontend client (e.g., iOS, Android, React). Instead of clients calling multiple generic backend APIs, the edge BFF aggregates upstream calls, injects credentials, and strips unneeded payload fields before transmission.
A Reverse Proxy is an intermediate server that intercepts requests from client applications and forwards them to one or more backend origin servers. The reverse proxy terminates TLS, applies security filtering, caches responses, and returns the result to the client as if it originated from the proxy itself.
API Rate Limiting is a traffic control mechanism that caps the number of requests a client, IP address, or API token can execute within a specified time window. Rate limiting prevents server overloading, protects against credential brute-forcing, and shields upstream APIs from exceeding subscription quotas.
An API proxy is an intermediary endpoint that receives client requests and forwards them to an upstream API, returning the upstream response to the client. It is commonly used to hide API keys, add CORS headers, enforce rate limits, cache results, and transform responses.
Ready-to-Use Edge Recipes
To solve lightweight api gateway for jamstack and static sites, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.
To solve best api gateway for react native mobile apps, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.
To solve zero code api gateway for indie hackers and solopreneurs, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.