OpenAPI Specification also known as Swagger Specification is an API description format for REST APIs. An OpenAPI file allows you to describe your entire API, including:
These API specifications can be written in YAML or JSON formats. These formats are interchangeable and include the same elements.
There are three primary areas in every OpenAPI document:
Swagger is a tool that is used to implement Open API specification.It is a set of open-source tools built around the OpenAPI Specification that can help you design, build, document and consume REST APIs.
The major Swagger tools include:
You can write OpenAPI definitions in YAML or JSON. Below is Sample OpenAPI 3.0 definition written in YAML looks like:
openapi: 3.0.0 info: title: Sample API description: Optional multiline or single-line description in [CommonMark](http://commonmark.org/help/) or HTML. version: 0.1.9 servers: - url: http://api.example.com/v1 description: Optional server description, e.g. Main (production) server - url: http://staging-api.example.com description: Optional server description, e.g. Internal staging server for testing paths: /users: get: summary: Returns a list of users. description: Optional extended description in CommonMark or HTML. responses: '200': # status code description: A JSON array of user names content: application/json: schema: type: array items: type: string
Note: All keywords are case sensitive.
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