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OpenAPI to Markdown Converter

Convert an OpenAPI 3.x or Swagger 2.0 JSON spec into readable Markdown API documentation with parameter, request body and response tables.

What is the OpenAPI to Markdown Converter?

Paste an OpenAPI 3. x or Swagger 2.

  • Supports both OpenAPI 3.x and Swagger 2.0, including the older in: body parameter style
  • Resolves local $ref pointers into components and definitions, with a depth guard for circular schemas
  • Merges shared path-level parameters into every operation
  • Parameter, request body and response tables with types, formats and required flags
  • Optional endpoint index and full schema reference section
  • Escapes pipes in descriptions so Markdown tables always render correctly

How to use the OpenAPI to Markdown Converter

  1. 1

    Paste your OpenAPI 3.x or Swagger 2.0 spec as JSON; convert a YAML spec to JSON first.

  2. 2

    Choose whether to include an endpoint index and a schema reference section.

  3. 3

    Click Generate Markdown.

  4. 4

    Check the path and operation counts to confirm the whole spec was read.

  5. 5

    Copy the Markdown or download it as api-reference.md.

About the OpenAPI to Markdown Converter

Paste an OpenAPI 3.x or Swagger 2.0 specification in JSON and this converter writes clean Markdown API documentation. Every path and method becomes a heading with its summary, followed by a parameter table, a flattened request-body property table and a response-code table.

Local $ref pointers into components or definitions are resolved inline, so a schema referenced from three endpoints is expanded at each one rather than left as an opaque pointer. Shared path-level parameters are merged into each operation, and pipes inside descriptions are escaped so tables never break.

You can add an endpoint index at the top and a full schema reference section at the bottom. The spec is parsed entirely in your browser — nothing is uploaded, and remote $ref URLs are deliberately left unresolved rather than fetched.

Frequently asked questions

How do I turn an OpenAPI spec into Markdown docs?

Paste the JSON and click Generate Markdown. Each path and method becomes a section with its summary, parameters, request body and responses laid out as tables you can paste straight into a README or a docs site.

Can I use a YAML OpenAPI file?

Not directly — this tool reads JSON. Convert your YAML spec to JSON first with a YAML to JSON converter, then paste the result here.

Does it support Swagger 2.0 as well as OpenAPI 3?

Yes. Swagger 2.0 documents are detected by their swagger key, and the older conventions are handled: the base URL is built from host, basePath and schemes, parameters carry their type inline, and bodies arrive as an in: body parameter.

What happens to $ref pointers?

Local pointers beginning with #/ are resolved against the document and expanded inline, with a depth limit so a self-referential schema cannot loop forever. Remote and URL references are left as they are, because resolving them would mean sending your spec off the page.

Why do only some response types show a schema?

Because the spec only lists one where the endpoint defines a response body. Codes like 204 or a bare 201 Created often carry just a description, so the type column shows a dash rather than inventing something.

Is my API specification uploaded?

No. The document is parsed inside your browser tab, which matters because specs frequently describe internal endpoints and unreleased functionality.

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