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OpenAPI / Swagger Validator
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OpenAPI / Swagger Validator

Validate OpenAPI 3.x or Swagger 2.0 specs for errors, warnings, and best practices.

Overview

Free online OpenAPI and Swagger spec validator. Paste your OpenAPI 3.x or Swagger 2.0 YAML/JSON and instantly check for errors, warnings, and best practices.

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Features

  • OpenAPI 3.x and Swagger 2.0
  • YAML or JSON paste support
  • Actionable error and warning list
  • Speeds up API design reviews
  • Copy cleaned spec after fixes
  • Works alongside your CI later
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