OpenAPI Validator

Validate OpenAPI JSON locally. Check core fields, paths, endpoint counts, and obvious structural issues in your browser.

Input FormatValidation LevelOutputMax Issues

OpenAPI JSON Or YAML

Upload OpenAPI file

Paste or upload an OpenAPI 3.x spec. JSON is fully parsed; YAML is checked structurally in-browser.

Validation Report

Free Online OpenAPI Validator

Use this lightweight OpenAPI validator for local structural checks before deeper schema validation.