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DevOps & Automation · Intermediate

OpenAPI Specification (OAS)

A vendor-neutral standard (formerly Swagger) for describing REST APIs in YAML or JSON, including paths, parameters, schemas, and authentication.

Definition

OpenAPI documents drive interactive documentation (Swagger UI), client and server code generation, mocking, and contract testing. Many network platforms publish OpenAPI specs.

Example

openapi: 3.1.0 with paths: /devices: get: responses: '200': ...

Exam tip

Swagger is the former name and tooling brand; OpenAPI is the specification.

Related terms