APIForge
DEVELOPER TOOL

Online OpenAPI Validator & Linter

Validate OpenAPI 3.0 and 3.1 specifications instantly with real-time error highlighting, $ref resolution, and schema linting.

Validate Your OpenAPI Spec

Paste your OpenAPI YAML or JSON specification into the workspace to detect errors and inspect endpoints.

Launch OpenAPI Validator →

What APIForge Validates

  • YAML & JSON syntax correctness and indentation
  • Required OpenAPI root object fields (openapi, info, paths)
  • Internal and external $ref pointer resolutions
  • HTTP method validity and parameter location rules (in: query, path, header)
  • Response status code declarations and schema objects

Frequently Asked Questions

What versions of OpenAPI are supported?
APIForge supports OpenAPI 3.0.x, OpenAPI 3.1.x, and legacy Swagger 2.0 specifications.
How does APIForge handle external $ref schemas?
APIForge resolves internal component pointers and fetches public HTTP/HTTPS schema references automatically.