The latest Internet-Drafts at the IETF are the draft-wright-json-schema*-01 documents, which correspond to the draft-06 meta-schemas. These were published on 2017-04-15. (Due to a change in authorship the I-D numbering was reset with the previous draft). Please see the release notes for more information on this release and information on migrating from previous drafts.
The specification is split into three parts, Core, Validation, and Hyper-Schema:
|JSON Schema Core||defines the basic foundation of JSON Schema|
|JSON Schema Validation||defines the validation keywords of JSON Schema|
|JSON Hyper-Schema||defines the hyper-media keywords of JSON Schema|
They are also available on the IETF main site: core (draft-wright-json-schema-01), validation (draft-wright-json-schema-validation-01) and hyper-schema (draft-wright-json-schema-hyperschema-01).
The meta-schemas are schemas against which other schemas can be validated. They are self-descriptive: the JSON Schema meta-schema validates itself, while the JSON Hyper-Schema meta-schema both validates itself and defines its own “self” link. The latest meta-schema is draft-06.
|Core/Validation meta-schema||Used for schemas written for pure validation.|
|Hyper meta-schema||Used for schemas written for validation and hyper-linking.|
If you are accessing the above meta-schema links from a web browser, you will need to save the file then open it as a JSON file.
Please see Specification Links for older drafts and the latest unreleased version of the specification.