Free API Documentation Builder

Build clear API documentation from your REST endpoints. Add parameters, responses, and code examples. Export as HTML or Markdown. Free API doc builder, no signup needed.

How to Use Free API Documentation Builder

1. Enter your project name and base URL, then click Add Endpoint to start
2. Select the HTTP method, enter the path, and add a description for each endpoint
3. Define query parameters, path parameters, headers, and request body fields with types
4. Add example responses for each status code then export as HTML or Markdown

Frequently Asked Questions

Why do I need API documentation?

API documentation helps developers understand how to use your API without reading source code. Good docs reduce support requests, speed up integration, and make your API more attractive to developers.

What should API documentation include?

Include: base URL, authentication method, each endpoint with HTTP method and path, request parameters with types and requirements, request body examples, response format with examples, and error codes.

Can I export the API docs as a file?

Yes, export your complete API documentation as an HTML file for web hosting, or as a Markdown file for GitHub READMEs. Both formats include all your endpoints, parameters, and examples.

Is this an alternative to Swagger/OpenAPI?

Our tool is simpler than Swagger — great for small to medium APIs and quick documentation needs. For complex enterprise APIs with code generation needs, Swagger/OpenAPI may be more appropriate.

Is this API doc builder free?

Yes, completely free with no signup. Add unlimited endpoints, define all parameters and responses, and export professional documentation at no cost.

Which HTTP methods should I document?

Document all methods your API uses: GET (retrieve), POST (create), PUT (full replace), PATCH (partial update), DELETE (remove). Include the exact URL path, required vs optional parameters, and a real request and response example for each method.