OpenAPI Specification: Write, Validate, and Generate Code
Write OpenAPI 3.1 specs in YAML or JSON: define paths, schemas, security, and use Spectral to lint and Swagger Codegen to produce client code.
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Tags: openapi, yaml, api
OpenAPI Specification Guide: Write, Validate, and Generate Code From Specs OpenAPI Specification (OAS) is the most widely adopted standard for describing REST APIs. An OpenAPI document is a machine-readable contract between an API and its consumers. It drives documentation, client SDKs, server stubs, mock servers, and contract testing — all from one YAML or JSON file. This guide covers OAS 3.1 structure, request/response schema modeling, security schemes, and the code generation and validation tools that make the spec a living part of your development workflow. --- Document Structure An OpenAPI 3.1 document has five required top-level sections and several optional ones: The field must be (a string, not a number). 3.1 aligns with JSON Schema 2020-12, which 3.0 did not — this matters for…
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