#restapidesign

An API is a promise. Once a mobile app, a frontend, or a partner depends on yours, changing it is painful and breaking it is worse. The good news is that good API design is mostly a set of well-worn conventions, not genius. This is the practical guide to designing REST APIs in 2026: resource naming, using HTTP properly, versioning, auth, pagination, errors, idempotency, and the mistakes that haunt teams later.

The HTTP QUERY method (RFC 10008) is a safe, idempotent, cacheable request with a body — the REST method that ends the GET-vs-POST workaround. Full guide.