OpenAPI Validator
Validate your OpenAPI 3.x specification. Paste JSON to check for errors and best practices.
OpenAPI Spec
About OpenAPI Validation
The OpenAPI Specification (formerly Swagger) is the industry standard for describing REST APIs. Validating your spec ensures compatibility with code generators, documentation tools, and API gateways.
What This Tool Checks
- Required fields:
openapi,info,paths - Valid path formats (must start with
/) - Operation requirements:
responses,operationId - Best practices: descriptions, server definitions, reusable components