Primitive data types in the OAS are based on the types supported by the JSON Schema Specification Wright Draft 00. It is RECOMMENDED that the root OpenAPI document be named: openapi.json or openapi.yaml. In the latter case, $ref fields MUST be used in the specification to reference those parts as follows from the JSON Schema definitions. Document StructureĪn OpenAPI document MAY be made up of a single document or be divided into multiple, connected parts at the discretion of the user. Note: While APIs may be defined by OpenAPI documents in either YAML or JSON format, the API request and response bodies and other content are not required to be JSON or YAML. Keys used in YAML maps MUST be limited to a scalar string, as defined by the YAML Failsafe schema ruleset.Tags MUST be limited to those allowed by the JSON Schema ruleset.In order to preserve the ability to round-trip between YAML and JSON formats, YAML version 1.2 is RECOMMENDED along with some additional constraints: Patterned fields MUST have unique names within the containing object. The schema exposes two types of fields: Fixed fields, which have a declared name, and Patterned fields, which declare a regex pattern for the field name. (OAS 2.0 documents contain a top-level version field named swagger and value "2.0".) FormatĪn OpenAPI document that conforms to the OpenAPI Specification is itself a JSON object, which may be represented either in JSON or YAML format.įor example, if a field has an array value, the JSON array representation will be used:Īll field names in the specification are case sensitive. Thus a hypothetical 3.1.0 specification SHOULD be usable with tooling designed for 3.0.0.Īn OpenAPI document compatible with OAS 3.*.* contains a required openapi field which designates the semantic version of the OAS that it uses. Subsequent minor version releases of the OpenAPI Specification (incrementing the minor version number) SHOULD NOT interfere with tooling developed to a lower minor version and same major version. The patch version SHOULD NOT be considered by tooling, making no distinction between 3.0.0 and 3.0.1 for example. Tooling which supports OAS 3.0 SHOULD be compatible with all OAS 3.0.* versions. patch versions address errors in this document, not the feature set. minor portion of the semver (for example 3.0) SHALL designate the OAS feature set. The OpenAPI Specification is versioned using Semantic Versioning 2.0.0 (semver) and follows the semver specification. The available status codes are defined by ] and registered status codes are listed in the IANA Status Code Registry. The HTTP Status Codes are used to indicate the status of the executed operation. Some examples of possible media type definitions: ![]() The media type definitions SHOULD be in compliance with ]. Media type definitions are spread across several resources. Path templating refers to the usage of curly braces () to mark a section of a URL path as replaceable using path parameters. An OpenAPI definition uses and conforms to the OpenAPI Specification. Definitions OpenAPI DocumentĪ document (or set of documents) that defines or describes an API. When properly defined, a consumer can understand and interact with the remote service with a minimal amount of implementation logic.Īn OpenAPI definition can then be used by documentation generation tools to display the API, code generation tools to generate servers and clients in various programming languages, testing tools, and many other use cases. The OpenAPI Specification (OAS) defines a standard, language-agnostic interface to RESTful APIs which allows both humans and computers to discover and understand the capabilities of the service without access to source code, documentation, or through network traffic inspection. This document is licensed under The Apache License, Version 2.0. The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “NOT RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be interpreted as described in BCP 14 ] ] when, and only when, they appear in all capitals, as shown here. Status of This DocumentThe source-of-truth for the specification is the GitHub markdown file referenced above. Similar to what interface descriptions have done for lower-level programming, the OpenAPI Specification removes guesswork in calling a service. When properly defined via OpenAPI, a consumer can understand and interact with the remote service with a minimal amount of implementation logic. ![]() OpenAPI Specification v3.0.0 | Introduction, Definitions, & More OpenAPI Specification v3.0.0 The OpenAPI Specification (OAS) defines a standard, programming language-agnostic interface description for HTTP APIs, which allows both humans and computers to discover and understand the capabilities of a service without requiring access to source code, additional documentation, or inspection of network traffic.
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