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OpenAPI, Swagger and Postman docs builder

API Documentation Generator

Paste, upload, or import an OpenAPI JSON/YAML specification or Postman collection and generate a polished app-style reference with searchable endpoints, OAuth2, bearer, basic and API-key auth, manual headers, browser request testing, schemas, examples, downloadable HTML, and starter API clients.

OpenAPI JSON or YAML

Supports OpenAPI 3.x, Postman collections, local parsing, URL import, file upload, and methods such as GET, POST, PATCH, DELETE, and QUERY.
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How to use this API Documentation Generator

Paste an OpenAPI 3.x JSON or YAML specification, upload a local spec file, import a public OpenAPI URL, or convert a Postman collection JSON file. Validate it, then generate documentation or a starter API client. The output includes searchable endpoint sections, authentication and security schemes, manual request headers, browser-based request testing, request and response schemas, required fields, enums, examples, status-code summaries, and code for common application platforms.

Supported OpenAPI features

  • OpenAPI 3.x JSON, YAML, and YML files with info, servers, paths, operations, parameters, request bodies, responses, examples, and components schemas.
  • OpenAPI securitySchemes, global security requirements, per-operation authentication rules, OAuth2 scopes, OpenID Connect, API keys in header/query/cookie, bearer tokens, and basic authentication.
  • Endpoint search and request panels that create cURL and JavaScript Fetch snippets, accept manual headers, and can send browser requests when the API allows CORS.
  • Common and uncommon HTTP methods, including QUERY for safe idempotent request-body searches.
  • Downloadable standalone HTML export and downloadable starter clients for common backend, frontend, mobile, and scripting environments.

FAQs

Does this support OpenAPI YAML?

Yes. The generator supports OpenAPI 3.x JSON, YAML, and YML documents, including paths, operations, schemas, examples, security schemes, and response definitions.

Can I import a Postman collection?

Yes. Upload a Postman collection JSON file to convert requests, headers, query parameters, request bodies, and sample responses into a generated OpenAPI-style documentation view.

Does the input leave my browser?

Pasted and uploaded specifications are parsed locally in the browser. If you import a public URL, your browser fetches that URL directly to load the specification.

Can I search generated endpoints?

Yes. Use the endpoint search box to filter by HTTP method, path, tag, operation ID, summary, or description.

Can I preview and run requests?

Yes. Each endpoint includes a Try request panel that builds cURL and JavaScript Fetch examples and can send the request from your browser. If CORS or network rules block the request, the tool shows a clear error.

Can I document QUERY endpoints?

Yes. The renderer recognizes QUERY as a valid HTTP method and displays it in endpoint navigation and generated sections.

Can I generate API clients?

Yes. Pick a language from the client generator dropdown to create a starter client that uses the parsed endpoints and request examples.