Summary of JSON Schema changes (Core & Validation)

JSON Schema 6

• "id"replaced by "$id"; "$id" replaces "id"
• "$ref" only allowed where a schema is expected
• "exclusiveMinimum" and "exclusiveMaximum" changed from a boolean to a number
• booleans as schemas, i.e., true is equivalent to {}, false is equivalent to {"not": {}}
• "propertyNames"
• "contains"
• "const"
• "required" allows an empty array
• "dependencies" allows an empty array for property dependencies
• "format": "uri-reference", "uri-template", "json-pointer"
• "examples"

JSON Schema 7

• "$comment"
• "if", "then", "else"
• "readOnly"
• "writeOnly"
• "contentMediaType"
• "contentEncoding"
• more formats: "iri", "iri-reference", "uri-template", "idn-email", "idn-hostname", "relative-json-pointer", "regex", "date", "time"

JSON Schema 2019-09

• by default, format is no longer an assertion.
• $anchor
• $defs (renamed from definitions)
• $id - only URI-references without fragments are allowed
• $recursiveAnchor and $recursiveRef
• $ref- other keywords are now allowed alongside of it
• $vocabulary
• dependentSchemas (split from dependencies)
• unevaluatedItems
• unevaluatedProperties
• dependentRequired (split from dependencies)
• maxContains and minContains
• more formats: "duration", "uuid"
• contentSchema
• deprecated

JSON Schema 2020-12

• $dynamicAnchor and $dynamicRef
• prefixItems
• validation output formats:
  • "flag", "basic", "detailed", or "verbose";
  • "valid", "errors", "annotations"
  • keywordLocation, absoluteKeywordLocation, instanceLocation
• format: date-time, email, idn-email