JSON Schema defines a media type for describing JSON document structure

The abstract states that JSON Schema defines application/schema+json for describing what a JSON document must look like, how to extract information from it, and how to interact with it. A related media type, application/schema-instance+json, is positioned for feature-rich integration beyond ordinary application/json. The extract identifies the work as an IETF Internet-Draft with informational status.

Listed editors are A. Wright, H. Andrews, B. Hutton (Postman), and G. Dennis. The draft was published 16 June 2022 and expires 18 December 2022 per the status section. Reader notes point to the json-schema-org issue tracker and json-schema.org for feedback and further information. As an Internet-Draft, it is framed as work in progress, not final reference material.

Structural description of JSON is a primary shared-meaning primitive for APIs, content systems, and agents that validate or generate payloads. Declaring a schema media type separates instance data from the contract that constrains it. That separation is what data contracts and schema registries rely on when multiple systems must assert the same shape without embedding rules only in application code.