OpenAPI / Swagger Validator
Paste an OpenAPI 3.x or Swagger 2.0 document (JSON or YAML) and get an instant structural verdict — version detection, required info fields, paths, valid HTTP methods, and per-operation responses, plus warnings for missing operationIds and descriptions.
Examples
Verdict
Valid spec- Version
- OpenAPI 3.x
- Paths
- 2
- Operations
- 3
No structural issues found.
About this tool
This is a structural sanity checker, not a full JSON-Schema validator. It confirms the document looks like a well-formed OpenAPI or Swagger spec: a recognised version, an info object with title and version, a paths object, real HTTP methods on each path, and a responses object on every operation. Everything runs in your browser — nothing is uploaded.