OpenAPI Extensions

OpenAPI extensions


OpenAPI extensions are reusable components that describe additional functionality beyond what is covered in the OpenAPI Specification. They are generally vendor specific, such as Amazon API Gateways extension. All OpenAPI extensions begin with x-.

OpenAPI extensions are supported at the Root and Operation level, Security definitions, Shared Parameters, and Shared Responses


  1. Select the modeling file you want to modify
  2. Select the level you want to add an extension to
  3. Click Add under Extensions
  4. Input the extension property under Extension
  5. Input extension value(s) under Value

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