Now in version 3.0.0, the latest release is described as a “culmination of nearly two years of collaboration among senior API developers and architects from across multiple industries” such as payment and banking, cloud computing, the Internet of Things, and vendors building API solutions.
Some of the most notable additions in this release include; support for describing callbacks, links to express relationships between operations, webhooks, enhanced examples, improved parameter descriptions, and better multipart document handling. Additional features add support for templated server URLs and semantic versioning.
OpenAPI is on an important mission to define REST APIs and create and promote a vendor neutral description format understandable by humans and machines. According to ProgrammableWeb, nearly 18,000 public APIs have been published since 2005, up nearly 1,000 in the past quarter of 2017 alone.
