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Developer tools · #openapi
Learn how Swagger UI and OpenAPI 3.0 annotations turn your code into a living API contract, eliminate documentation drift, and enable safe in‑browser testing.
Implementing OAuth2 Authorization Code flow in Swagger is straightforward: declare the flow in the spec, configure Swagger UI, and add a stateless JWT validator. Follow the checklist to avoid common pitfalls and know when to redesign.
Model mutually exclusive API payloads with OpenAPI oneOf, anyOf, and discriminators — with a working payment schema, validation checks, and honest tooling trade-offs.
Learn how to model polymorphic payloads with an OpenAPI discriminator, see a worked Pet/Cat/Dog example, and understand validation limits and common pitfalls.
How to model polymorphic request and response bodies in OpenAPI 3.x using oneOf with a discriminator: a worked Pet/Cat/Dog schema, why the mapping table and required property matter, and the pitfalls that break validators and generators.
Learn how Ballerina’s @Service and @Resource annotations let the compiler generate OpenAPI 3.0 docs that stay in sync with your REST implementation.
Ballerina’s built‑in <code>openapi</code> command turns annotated services into a full OpenAPI 3.0 spec and optional client stubs, keeping contracts in sync with the code and speeding up API‑first workflows.
Deciding between Code-First and Design-First OpenAPI strategies in Spring Boot. Compare trade-offs between development velocity and contract stability with implementation examples.
Ballerina’s automatic OpenAPI generation turns your HTTP service into a ready‑to‑use Swagger spec. Learn how to leverage annotations, serve the spec, and validate it in a few simple steps.
swagger
ballerina