A JSON reference is an object with only a field named `$ref`, containing a URI that points to the resource providing the actual value that should have been in place of the JSON object.
JSON reference is not officially standardized, but a common convention is described in a draft specification on IETF:
a JSON structure which allows a JSON value to reference another value in a JSON document. This provides the basis for transclusion in JSON: the use of a target resource as an effective substitute for the reference.
(A JSON reference allows) transclusion in JSON: the use of a target resource as an effective substitute for the reference.
Example:
{
"$ref": "https://example.com/data.json"
}
JSON references are commonly used in JSON specification documents, such as OpenAPI, JSON Schema, JSON spec.
