AI API Documentation Generator for REST & OpenAPI
Use our AI API documentation generator to turn code snippets and REST endpoints into clean OpenAPI and Swagger specs. Start your free trial today.
About AI API Documentation Generator
The AI API documentation generator automatically analyzes your backend code, routes, and JSON payloads to create structured, production-ready documentation. It is designed for developers, engineering managers, and technical writers who need accurate OpenAPI and Swagger specifications without spending hours writing boilerplate markdown or YAML.
Instead of manually describing request schemas, authentication headers, and response codes, paste your code or endpoint definitions directly into the browser. Doffl generates clear, standardized documentation you can export instantly to streamline your team's workflow.
Key features
- Generates complete OpenAPI 3.0 and Swagger specifications
- Extracts request parameters and response schemas from code
- Supports multiple programming languages and web frameworks
- Creates interactive markdown and structured YAML exports
- Identifies standard HTTP status codes and error responses
- Includes customizable authentication and endpoint tagging options
How to use AI API Documentation Generator
- Paste your route code, JSON payload, or endpoint definition.
- Select your preferred documentation format, such as OpenAPI or Markdown.
- Click Generate to analyze the endpoints and build schemas.
- Review and refine the generated parameters, descriptions, and types.
- Export the final documentation as JSON, YAML, or Markdown.
Who is it for?
- Backend developers documenting legacy REST APIs with missing specs
- Startups preparing public-facing API references for developer portals
- Technical writers standardizing inconsistent endpoint documentation across teams
- Software agencies delivering documented codebases to clients on tight schedules
Frequently asked questions
Which API formats does the generator support?
The tool generates specifications compatible with OpenAPI 3.0, Swagger 2.0, and standard Markdown for developer portals.
Can I generate documentation directly from source code?
Yes, you can paste route controllers and handler functions written in languages like JavaScript, Python, Go, and PHP to extract schemas automatically.
Is the AI API documentation generator free?
Doffl offers a free trial that lets you test documentation generation. Ongoing access and advanced export features require an active paid plan.
How does the AI detect response schemas?
The tool parses return objects, database models, and sample JSON payloads to determine data types, required fields, and nested structures.
Can I edit the generated API documentation?
Yes, you can modify parameter descriptions, endpoint summaries, and response codes directly within the tool before exporting your file.