What is OpenAPI?

OpenAPI, initially known as Swagger, is a specification format designed for defining HTTP APIs in a way that is both machine-readable and human-friendly, with JSON Schema underpinning its data description. It serves multiple purposes, such as establishing an API contract, generating documentation, mock servers, client SDKs, and facilitating API governance checks. OpenAPI has evolved through several phases since its inception in 2011, with significant milestones including the transition to OpenAPI 3.0 in 2017 and further enhancements in version 3.1 in 2021. Although OpenAPI and Swagger are linked historically, they differ as OpenAPI refers to the specification while Swagger encompasses a suite of tools. The structure of an OpenAPI document involves general API information, paths and operations, security modes, and reusable components, all structured in JSON or YAML. Despite its benefits like interoperability, easier collaboration, and acting as a guide for governance, OpenAPI has limitations such as complex maintenance, repetition issues, and limited support for non-REST architectures, with ongoing efforts to address some of these challenges.

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