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Developer tools · #openapi
Learn how to eliminate redundancy in OpenAPI 3.0 specifications by using components/schemas and $ref pointers to create a single source of truth for your data models.
When an API returns different event shapes, documenting them clearly is hard. This post shows how OpenAPI 3.x’s oneOf and discriminator can model such polymorphic responses, with a live example, trade‑offs, and best‑practice checklist.
Write one OpenAPI file and let it drive request validation, generated clients, and docs. A worked POST /orders example, the operationId trap, and the 3.0 vs 3.1 pitfalls.
Learn when to use an OpenAPI discriminator for polymorphic schemas, how it compares to oneOf/anyOf, and see a concrete Pet API example with validation steps.
Learn how to add an OAuth2 Authorization Code security scheme to an OpenAPI document so Swagger UI shows an Authorize button, completes the flow, and attaches Bearer tokens to test calls.
A diagnostic walkthrough for Swagger UI Try it out failures: how to read the Network tab, tell CORS from auth and payload errors, and fix the right layer.
Stop fighting documentation drift. Learn how a contract-first approach with OpenAPI ensures your server, client, and docs stay perfectly in sync.
A step-by-step guide to creating UML 2.5 sequence diagrams from OpenAPI specs — covering lifelines, synchronous/asynchronous messages, combined fragments for error handling, and validation checks that keep diagrams aligned with implementation.
Decision framework for choosing OpenAPI 3.1 vs 3.0.x: validation fidelity, tooling maturity, migration cost, and interoperability boundaries. Includes concrete linting, generation, and gateway benchmark commands.
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