OpenAPI / Swagger Documentation Generator

An OpenAPI document — or its predecessor, a Swagger 2.0 file — is the contract for a REST API: it declares every path, the methods on it, the parameters and request bodies they accept, and the responses they return. But as raw JSON or YAML that contract is almost unreadable, and a contract nobody reads is a contract nobody follows. This generator takes that file and renders it as interactive documentation through Swagger UI, so each endpoint becomes an expandable card with its schema, examples and response codes laid out the way a consumer actually explores an API.

Before it renders anything it validates. The parser accepts JSON or YAML (and a URL fetch with an automatic CORS-proxy fallback), then runs a structural pass that flags the mistakes that quietly break tooling downstream — a missing openapi/swagger version marker, an absent info block, or a paths object with nothing in it — each reported inline with a severity and a concrete suggested fix. A live quality score turns that feedback into a single number you can watch while you author.

Documentation is only half the job; the workbench also lets you compare two versions of a spec to see how an API changed between releases, and generate test scaffolds straight from the paths so you have a starting harness to drive against a live server. Everything runs in your browser — the spec is never uploaded — which is what makes it safe to point at an internal or unreleased API.

For the structural view of an API, the REST Endpoint Visualizer maps every operation grouped by resource; the API Mock Server Generator turns the same spec into a stand-in server you can develop against; and the JSON Schema Explorer drills into the request and response models behind each endpoint.