Swagger Example

api.yaml

openapi: 3.0.0
info:
  version: 1.0.0
  title: Simple API
  description: A simple API to illustrate OpenAPI concepts

servers:
  - url: https://example.io/v1

paths:
  /artists:
    get:
      description: Returns a list of artistss 
      parameters:
        #  ----- Added line  ------------------------------------------
        - $ref: '#/components/parameters/PageLimit'
        - $ref: '#/components/parameters/PageOffset'
        #  ---- /Added line  ------------------------------------------
      responses:
        '200':
          description: Successfully returned a list of artists
          content:
            application/json:
              schema:
                type: array
                items:
                  #  ----- Added line  --------------------------------
                  $ref: '#/components/schemas/Artist'
                  #  ---- /Added line  --------------------------------
        '400':
          #  ----- Added line  ----------------------------------------
          $ref: '#/components/responses/400Error'
          #  ---- /Added line  ----------------------------------------

    post:
      description: Lets a user post a new artist
      requestBody:
        required: true
        content:
          application/json:
            schema:
              #  ----- Added line  ------------------------------------
              $ref: '#/components/schemas/Artist'
              #  ---- /Added line  ------------------------------------
      responses:
        '200':
          description: Successfully created a new artist
        '400':
          #  ----- Added line  ----------------------------------------
          $ref: '#/components/responses/400Error'
          #  ---- /Added line  ----------------------------------------    

  /artists/{username}:
    get:
      description: Obtain information about an artist from his or her unique username
      parameters:
        - name: username
          in: path
          required: true
          schema:
            type: string
          
      responses:
        '200':
          description: Successfully returned an artist
          content:
            application/json:
              schema:
                type: object
                properties:
                  artist_name:
                    type: string
                  artist_genre:
                    type: string
                  albums_recorded:
                    type: integer
                
        '400':
          #  ----- Added line  ----------------------------------------
          $ref: '#/components/responses/400Error'
          #  ---- /Added line  ----------------------------------------     

components:
  securitySchemes:
    Authorization:        # arbitrary name for the security scheme
      type: apiKey
      in: header       # can be "header", "query" or "cookie"
      name: Authorization  # 

  schemas:
    Artist:
      type: object
      required:
        - username
      properties:
        artist_name:
          type: string
        artist_genre:
            type: string
        albums_recorded:
            type: integer
        username:
            type: string

  #  ----- Added lines  ----------------------------------------
  parameters:
    PageLimit:
      name: limit
      in: query
      description: Limits the number of items on a page
      schema:
        type: integer
      
    PageOffset:
      name: offset
      in: query
      description: Specifies the page number of the artists to be displayed
      schema:
        type: integer

  responses:
    400Error:
      description: Invalid request
      content:
        application/json:
          schema:
            type: object 
            properties:
              message:
                type: string
  #  ---- /Added lines  ----------------------------------------