JSON Schema is not affiliated with JSON and should not be confused with it. JSON is a data format, like YAML, and there is only one version of it: the spec at http://json.org/.
Sadly, this is utterly wrong.
https://tools.ietf.org/html/rfc8259 https://tools.ietf.org/html/rfc7159 https://tools.ietf.org/html/rfc7158 https://tools.ietf.org/html/rfc4627 http://www.ecma-international.org/publications/files/ECMA-ST... https://www.iso.org/standard/71616.html