Validate OpenAPI document
Validate an OpenAPI 3.0.x document against the specification schema.
Input & settings
How to use this tool
Paste your source, choose the supported options, then process. Inspect or download the complete result.
Limits and behavior
Supports OpenAPI 3.0.x in JSON or YAML. Remote references are not fetched; this is document-shape validation, not API behavior testing or full reference resolution. Maximum total input 1 MB, output 3 MB, JSON nesting 64 levels. Processing stays in your browser worker. Input is limited to 1 MB and output to 3 MB. No input content is saved by CraftAI.
Validate an OpenAPI 3.0 document
Check an OpenAPI 3.0.x specification document for supported structural and semantic schema requirements.
Can it guarantee a live API behaves as documented?
No. Specification validation does not send integration tests to endpoints or verify their responses.
Related tools: validate json against schema · validate yaml