OpenAPI / Swagger Viewer
Paste an OpenAPI or Swagger specification to render interactive API documentation. Supports JSON and YAML formats with endpoint grouping, parameter tables, and response codes.
OpenAPI Specification
Paste an OpenAPI or Swagger specification to view rendered documentation
OpenAPI / Swagger Viewer
Paste an OpenAPI or Swagger specification to render interactive API documentation. Supports JSON and YAML formats with endpoint grouping, parameter tables, and response codes.
Features
- Parse and render OpenAPI 3.x and Swagger 2.0 specifications
- Interactive endpoint navigation grouped by tags
- Color-coded HTTP method badges (GET, POST, PUT, DELETE, PATCH)
- Parameter tables with type, location, and requirement info
- Request body schema display with property details
- Response code listing with descriptions
How to use
- Paste your OpenAPI/Swagger JSON or YAML specification, or click Sample to load an example.
- Toggle between JSON and YAML format if needed.
- Browse the rendered documentation: expand tags and endpoints to see parameters, request bodies, and responses.
Tips & Best Practices
- All processing happens in your browser — no data is sent to any server.
- Use the copy button to quickly transfer results to your clipboard.
- The tool works offline once loaded — no internet connection required for processing.
- Check the FAQ section below for answers to common questions.
- Share this tool with colleagues using the social sharing buttons.
FAQ
What OpenAPI versions are supported?
The viewer supports both OpenAPI 3.x and Swagger 2.0 specification formats. It parses the paths, operations, and schema objects from either version.
Does it support YAML input?
Yes. You can toggle between JSON and YAML format. The built-in YAML parser handles common OpenAPI structures including nested objects, arrays, and inline values.
Can I use this with my private API specs?
Absolutely. All parsing and rendering happens entirely in your browser. Your API specification never leaves your device, making it safe for proprietary and internal APIs.
How are endpoints organized?
Endpoints are grouped by their tags as defined in the specification. Each group can be expanded or collapsed, and individual endpoints reveal their full details when clicked.
Does it show request and response schemas?
Yes. For endpoints with a request body, the viewer displays the schema properties including name, type, required status, and description. Response codes with their descriptions are also shown.
What HTTP methods are color-coded?
GET (green), POST (blue), PUT (orange), DELETE (red), PATCH (yellow), and OPTIONS/HEAD (purple) each have distinctive color badges for quick visual identification.