Does this checklist apply to gRPC and GraphQL APIs too?

Yes. The reliability, auth, observability, and CI/CD sections apply identically to gRPC and GraphQL. The security section's input-validation item covers the query/argument layer regardless of protocol. The only API-style-specific addition you might want is query complexity limiting for GraphQL — add that as a note in the rate-limiting item.

What's the single most important item for an API?

Timeouts on all external calls. Without them, a slow downstream service will exhaust your connection pool and take down your API entirely — even if your own code is perfect. Pair it with retries + exponential backoff + jitter, and a circuit breaker to fail fast during sustained outages. Together these three patterns prevent cascade failures.

Do I need an OpenAPI spec to ship an API?

For an internal API, no. For any API other teams or external clients will consume, yes — an OpenAPI/Swagger spec is the contract. Without it, every consumer guesses at your shapes and breaks silently when you change them. It also unlocks auto-generated client SDKs and docs. The Documentation section flags this as critical for API/backend stacks.

~55 checks · 7 critical sections

Production Readiness Checklist for REST APIs & Backends

Free production readiness checklist for REST APIs and backend services — auth, rate limiting, idempotency, observability, CI/CD & more. Filtered to what APIs need. No signup.

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A backend service in production is judged by different standards than a web app. Nobody cares about your API's button contrast — they care whether it authenticates correctly, retries safely, fails gracefully, and can be observed when it breaks at 3am.

This checklist filters the full 92-item production readiness framework down to the ~55 checks that genuinely matter for a REST API, gRPC service, microservice, or backend-for-frontend. It emphasizes reliability patterns (retries with backoff, circuit breakers, idempotency keys), security (rate limiting, CORS, webhook signature verification), and observability (distributed tracing, SLOs, health probes).

APIs are the layer where small oversights become cascading outages. A missing timeout on one external call can take down your whole service. Run this checklist before you expose your API to real traffic.