openapi: 3.0.0
info:
  title: Your API
  version: 1.0.0
paths:
  /:
    get:
      summary: Get a greeting message
      operationId: index_view
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              example:
                message: Hello, world!
  /user:
    post:
      summary: Create a user
      operationId: create_user
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/User'
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              example:
                username: JohnDoe
                age: 25
components:
  schemas:
    User:
      type: object
      properties:
        username:
          type: string
        age:
          type: integer