APIs.json Specification

The APIs.json specification defines a machine-readable JSON or YAML format for describing API operations. Unlike OpenAPI which describes the technical interface of a single API, APIs.json describes the surrounding operations of one or more APIs — documentation, authentication, pricing, terms of service, support, and other properties. Created by Kin Lane and Steven Willmott in May 2014, the specification is maintained as an informal IETF draft at apisjson.org. The current stable version is 0.19, published November 6, 2024. APIs.json files are placed at the domain root as /apis.json or /apis.yml for automated discovery by robots and search engines.