OpenAPI Validator

Validate an OpenAPI 3.0 or 3.1 document in JSON or YAML and review the HTTP operations it defines. Validation and summary generation run in this browser tab.

What is checked

The validator checks required root fields, info metadata, paths, operations, responses, parameters, duplicate operation IDs, response codes, and local references. The endpoint table lists each detected method, path, summary, operationId, and response code.

Reference handling

Local JSON Pointer references beginning with # are resolved against this document. External references are reported as warnings and are not fetched.

Related tools: JSON Schema Validator · YAML Formatter