OpenAPI / Swagger Viewer

Your spec is parsed entirely in your browser

OpenAPI Spec

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Drop a spec file here, or click to browse

.yaml, .yml, .json

Paste, upload, or fetch an OpenAPI 3.0/3.1 spec to explore its endpoints and schemas.

About OpenAPI

OpenAPI (formerly Swagger) is the standard machine-readable format for describing REST APIs: every path, parameter, request body, and response, plus reusable components/schemas. This tool supports OpenAPI 3.0.x and 3.1.x, in either YAML or JSON.

A well-formed spec is what powers Swagger UI, generated SDKs, contract testing, and increasingly, AI agents that call your API directly from the spec alone.

Quick Tips

Fetching a spec by URL requires the server to allow CORS — if it's blocked, download the file and use the upload option instead
External $refs (pointing at other files or URLs) aren't resolved — inline $refs within the same document are
Use the search bar to jump straight to an endpoint or schema property instead of scrolling
Swagger (OpenAPI 2.0) specs aren't supported — convert to 3.0 or 3.1 first