OAS 3 This guide is OpenAPI 3.0.

API General Info

It is considered to be a good practice to include general information about your API into the specification: version number, license notes, contact data, links to documentation, and more. We particularly recommend doing this for publicly available APIs; as this will can increase user confidence in the services, your company provides. To specify the API metadata, you use properties of the top-level info object:
openapi: 3.0.0

  # You application title. Required.
  title: Sample Pet Store App

  # API version. You can use semantic versioning like 1.0.0, 
  # or an arbitrary string like 0.99-beta. Required.
  version: 1.0.0 

  # API description. Arbitrary text in CommonMark or HTML.
  description: This is a sample server for a pet store.

  # Link to the page that describes the terms of service.
  # Must be in the URL format.
  termsOfService: http://example.com/terms/

  # Contact information: name, email, URL.
    name: API Support
    email: [email protected]
    url: http://example.com/support

  # Name of the license and a URL to the license description.
    name: Apache 2.0
    url: http://www.apache.org/licenses/LICENSE-2.0.html

  # Link to the external documentation (if any).
  # Code or documentation generation tools can use description as the text of the link. 
    description: Find out more
    url: http://example.com

The title and version properties are required, others are optional.


Info Object

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