$schema

Function

The “$schema” keyword is both used as a JSON Schema version identifier and the location of a resource which is itself a JSON Schema, which describes any schema written for this particular version.

This keyword MUST be located at the root of a JSON Schema. The value of this keyword MUST be a URI [RFC3986] and a valid JSON Reference [json-reference]; this URI MUST be both absolute and normalized. The resource located at this URI MUST successfully describe itself. It is RECOMMENDED that schema authors include this keyword in their schemas.

Customization

When extending JSON Schema with custom keywords, schema authors SHOULD define a custom URI for “$schema”. This custom URI MUST NOT be one of the predefined values.

Valid Values

The value must be a string that is a valid URI.

Examples

{ “$schema”: “http://json-schema.org/draft-04/schema#” }

Meta-schema

{
	"type": "string",
	"format": "uri"
}