--- title: "API Documentation Generator" description: "Generate professional API documentation in Markdown or OpenAPI format. Define endpoints, request/response examples, and export ready-to-use documentation." url: https://findutils.com/developers/api-docs-generator/ category: developers --- # API Documentation Generator Generate professional API documentation in Markdown or OpenAPI format. Define endpoints, request/response examples, and export ready-to-use documentation. **Use this tool:** [API Documentation Generator](https://findutils.com/developers/api-docs-generator/) ## Programmatic access - REST id `api-docs-generator`: POST https://api.findutils.com/api/tools/api-docs-generator/execute (reference: https://findutils.com/api/api-docs-generator/) - MCP tool `api_docs_generator` on https://mcp.findutils.com (reference: https://findutils.com/mcp/api-docs-generator/) ## Why Use an API Documentation Generator? Good API documentation improves developer experience and adoption. This tool helps you quickly create consistent, professional documentation without manually writing Markdown or OpenAPI specifications. ## Tips for Better API Documentation - Use descriptive endpoint summaries that explain what the route does, not just its path. Good summaries improve readability in both Markdown and Swagger UI. - Include realistic JSON examples in request and response fields. Developers rely on examples more than schema definitions when integrating quickly. - Keep path parameters consistent across endpoints. If you use /users/{userId} in one route, avoid switching to /users/{id} in another. - Add response codes beyond 200. Documenting 400, 401, and 404 responses helps consumers handle errors gracefully from day one. - Generate both Markdown and OpenAPI outputs. Use Markdown for your README and the OpenAPI spec for interactive tools like Swagger UI or Redoc. ## FAQ ### What formats are supported? You can generate Markdown documentation (great for GitHub READMEs) or OpenAPI 3.0 JSON specifications (compatible with Swagger UI, Redoc, and other API tools). ### How do I document path parameters? Use curly braces in your path like /users/{id}. The generated documentation will preserve this format. For detailed parameter documentation, add them to the endpoint description. ### Can I import existing documentation? Currently this tool is for creating new documentation. For editing existing OpenAPI specs, use our OpenAPI Validator tool to check your specifications. ### Does the API Documentation Generator require a signup? No. FindUtils API Documentation Generator works with no signup, no usage limits. You can generate as many docs as you need without creating an account. ### Is my API data safe when using this tool? All processing happens in your browser. No endpoint definitions, request bodies, or response examples are sent to any server. Your proprietary API designs remain completely private. ### Can I use the generated OpenAPI spec with Swagger UI? Yes. The tool outputs valid OpenAPI 3.0 JSON that works directly with Swagger UI, Redoc, Stoplight, and any other renderer that accepts the OpenAPI specification format. ### How do I document authentication requirements? Add authentication details in the API description field and in individual endpoint descriptions. For OpenAPI output, the generated spec provides a foundation you can extend with securitySchemes after export. ### What is the difference between Markdown and OpenAPI output? Markdown output is human-readable text ideal for GitHub READMEs and wikis. OpenAPI 3.0 JSON is a machine-readable specification that powers interactive documentation tools like Swagger UI and can generate client SDKs automatically. ### Can I generate documentation for GraphQL APIs? This tool is designed for REST APIs. For GraphQL, use the FindUtils GraphQL Schema Validator to check your schema, then document it with tools purpose-built for the GraphQL ecosystem. ### How many endpoints can I document at once? There is no limit. You can add as many endpoints as your API requires. The tool handles small services with a handful of routes and larger APIs with dozens of endpoints equally well. ## Related Tools - [OpenAPI Validator](https://findutils.com/developers/openapi-validator/) - [Swagger to OpenAPI](https://findutils.com/developers/swagger-to-openapi/) - [JSON Formatter](https://findutils.com/developers/json-formatter/) - [Postman to cURL](https://findutils.com/developers/postman-to-curl/) - [cURL to Code](https://findutils.com/developers/curl-to-code/) - [JSON Schema Validator](https://findutils.com/developers/json-schema-validator/) - [GraphQL Schema Validator](https://findutils.com/developers/graphql-schema-validator/) - [JSON to TypeScript](https://findutils.com/developers/json-to-typescript/)