A Sample OpenAPI 3.0 File to Get Started
A Sample OpenAPI 3.0 File to Get Started
Take a look at an example OpenAPI 3.0 file to get familiar with what's new in OpenAPI 3.0. API Evangelist Kin Lane walks us through his thoughts and the next steps.
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I am investing more time into my Schema.org work, alongside my learning about OpenAPI 3.0. I’m pretty excited about the components object, and I want to push forward some of my Schema.org dictionary ideas, to help folks get better at reusing common schema throughout their work. Schema.org is the most robust vocabulary out there, and we shouldn’t be reinventing the wheel in this area. I know the most important reason that folks aren’t using is that they either don’t know about it, or they are just lazy. I figure if I create some ready to go schema in an OpenAPI 3.0 components object, maybe people will be more inclined to put common schema to use.
To share my components I need basic OpenAPI 3.0 shell to hold all my reusable schema. I really don’t care about the paths, and other elements being there. So I headed over to the OpenAPI 3.0 Github repo and borrowed the sample Petstore OpenAPI 3.0 my friend Darrel Miller created:
openapi: "3.0.0"
info:
version: 1.0.0
title: Swagger Petstore
license:
name: MIT
servers:
- url: http://petstore.swagger.io/v1
paths:
/pets:
get:
summary: List all pets
operationId: listPets
tags:
- pets
parameters:
- name: limit
in: query
description: How many items to return at one time (max 100)
required: false
schema:
type: integer
format: int32
responses:
200:
description: An paged array of pets
headers:
x-next:
description: A link to the next page of responses
schema:
type: string
content:
application/json:
schema:
$ref: "#/components/schemas/Pets"
default:
description: unexpected error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
post:
summary: Create a pet
operationId: createPets
tags:
- pets
responses:
201:
description: Null response
default:
description: unexpected error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/pets/{petId}:
get:
summary: Info for a specific pet
operationId: showPetById
tags:
- pets
parameters:
- name: petId
in: path
required: true
description: The id of the pet to retrieve
schema:
type: string
responses:
200:
description: Expected response to a valid request
content:
application/json:
schema:
$ref: "#/components/schemas/Pets"
default:
description: unexpected error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
components:
schemas:
Pet:
required:
- id
- name
properties:
id:
type: integer
format: int64
name:
type: string
tag:
type: string
Pets:
type: array
items:
$ref: "#/components/schemas/Pet"
Error:
required:
- code
- message
properties:
code:
type: integer
format: int32
message:
type: stringI will change all the information in this sample to reflect my work, but I figured before I did I would share this example document with my readers. At first glance, it doesn’t look much different than version 2.0 of OpenAPI, but once you start studying you see the differences. You see the responses have JSON specific content types inserted in between their schema references. There is also a components object, with a couple of schema present–this is all I need. There are a bunch of other things you can store in your components object, but I think this provides a nice first look at what is going on.
If you are looking for some other working examples of OpenAPI 3.0 in action, head over to Mike Ralphson’s repository, he has some additional ones you can play with. I don’t know about you, but I learn from others. I need to reverse engineer API definitions from other people before I become fluent myself. I’m going to spend some time hand-crafting some OpenAPI 3.0 definitions, so that I become more fluent. It is tedious work when you are just getting going, but once you get it down, it becomes like any other language you use. I’m hoping to cut my teeth on this Schema.org work. I’m going to replicate the OpenAPI 2.0 work I did when I created over a 1,000 OpenAPIs for each of the Schema.org objects. I’m going to be using them to deploy APIs for clients, and in my API training and storytelling. I want all my examples to be reusable patterns that already exist, not anything custom that I pull out of my magic arse.
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