Have you created API documentation using Swagger or similar tools?

Yes, I have created API documentation using Swagger (OpenAPI). This tool allows describing REST APIs in YAML or JSON format, after which interactive documentation is automatically generated, which can be used for testing and familiarization with the API.

An example of a simple API description in Swagger YAML:

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

This approach simplifies support and understanding of the API for both developers and testers.