What is OpenAPI?

OpenAPI is a specification for describing RESTful APIs in a machine-readable format (usually YAML or JSON). It allows developers and systems to:

• Standardize the description of endpoints, methods, parameters, data schemas, and API responses.
• Automatically generate documentation, client libraries, and tests.
• Improve communication between development teams and clients.

An example of a simple OpenAPI description:

openapi: 3.0.0
info:
  title: Example API
  version: 1.0.0
paths:
  /users:
    get:
      summary: Get a list of users
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
                  properties:
                    id:
                      type: integer
                    name:
                      type: string

OpenAPI helps standardize and simplify working with APIs at all stages of development.