Documenting with OpenAPI

Documentation that cannot lie

An OpenAPI description covers paths, parameters, schemas, and responses in a machine-readable form, which means clients, mocks, and documentation pages can all be generated from it.

Hand-written documentation drifts within weeks. Deriving the specification from the same schemas your validation uses keeps them aligned by construction.

Document error responses too. An API that only describes its happy path leaves every client to discover failure modes in production.