OpenAPI Specification

Internal

• OpenAPI Specification

Overview

The document addresses both OpenAPI 2.0 and OpenAPI 3.0. The differences will be emphasized.

Swagger Java Model

info

title

When imported in AWS API Gateway, the title provides the API name.

Paths

Each path contains zero or one of these Operations: GET, POST, PUT, HEAD, DELETE, PATCH, OPTIONS, a list of Parameters and a map of vendor extensions.

Operations

OpenAPI 2.0 Operation

Tags

Grouping Operations with Tags

tags:
  -name: tag-a
   description: Something that would shed light on tag-a semantics
   externalDocs:
    url: http://example.com/my-docs/tag-a.html
   
paths:
  /a:
    get:
      tags:
        - tag-a
        - other-tag

Each API operation can be annotated with a list of tags. Tagged operations may be handled differently by tools and libraries. Optionally, each tag can get a "description" and an "externalDocs" in the global "tags" section on the root level. The tag names here should match those used in operations. The tag order in the global tags section also controls the default sorting in the UI - at least, for Swagger UI. It is possible to use a tag at operation level even if it is not specified on the root level.

Organizatorium

x-nullable

Appears in automatically generated Swagger files, as such:

definitions:
    LibraryAccount:
      type: object
      required:
      - name
      properties:
        name:
          type: string
          x-nullable: true

definitions:
  A:
    type: string
    title: A
    x-nullable: true

When used for an API Gateway import, it errors out as:

Unable to create model for 'LibraryAccount': Invalid model specified: Validation Result: warnings : [], errors : [Invalid model schema specified. Unsupported keyword(s): ["x-nullable"]]