_index.md

title	section
Migrating from older drafts	docs

Introduction

Just as your schemas evolve over time, the JSON Schema specification does as well. This guide provides useful information to make upgrading your schemas across versions of the specification a breeze.

Learn how to use our migration guides and tooling (AlterSchema) to bring your work with you.

Keywords Overview

Here is a comprehensive overview to get you going.

All Keywords	Specification	Draft introduction	Removed	Changed
$anchor	Core	2019-09	No	No (updated in 2020)
$comment	Core	07	Yes	-
$id	Core	06	No	Replaced id
$defs	Core	2019-09	No	Replaced definitions
$dynamicAnchor	Core	2020-12	No	Replaced $recursiveAnchor
$dynamicRef	Core	2020-12	No	Replaced $recursiveRef
$recursiveAnchor	Core	2019-09	No	Replaced by $dynamicAnchor
$recursiveRef	Core	2019-09	No	Replaced by $dynamicRef
$ref	Core	2019-09	No	No
$schema	Core	02	No	No
$vocabualry	Core	2019-09	No	No
additionalItems	Core	03	No	No
allOf	Core	04	No	No
anyOf	Core	04	No	No
const	Validation	06	No	No
contains	Core	06	No	No
contentEncoding	Validation	07	No	No
contentMediaType	Validation	07	No	No
contentSchema	Validation	2019-09	No	No
definitions	Validation	04	No	Replaced by $defs
default	Validation	01	No	No
dependencies	Core	03	No	No
dependentRequired	Validation	2019-09	No	No
dependentSchemas	Core	2019-09	No	Replaced dependencies
deprecated	Validation	2019-09	No	No
disallow	Validation	03	Yes	No
divisibleBy	Validation	02	No	Replaced by multipleOf
else	Core	07	No	No
enum	Validation	01	No	No
examples	Validation	06	No	No
exclusiveMaximum	Validation	03	No	Replaced maximumCanEqual
exclusiveMinimum	Validation	03	No	Replaced minimumCanEqual
extends	Validation	03	Yes	No
format	Validation	02	No	-
id	Core	04	No	Replaced by $id
if	Core	07	No	No
items	Core	2019-09	No	Replaced by prefixItems
maxContains	Validation	2019-09	No	No
maxProperties	Validation	04	No	No
maximumCanEqual	Validation	02	No	Replaced by exclusiveMaximum
minimumCanEqual	Validation	02	No	Replaced by exclusiveMinimum
minContains	Validation	2019-09	No	No
minProperties	Validation	04	No	No
multipleOf	Validation	04	No	Replaced divisibleBy
not	Core	04	No	No
oneOf	Core	04	No	No
optional	Validation	02	No	Replaced by required
pattern	Core	03	No	No
patternProperties	Core	03	No	No
prefixItems	Core	2020-12	No	Replaced items
propertyNames	Core	06	No	No
readOnly	Validation	07	No	No
required	Validation	03	No	No
requires	Validation	02	Yes	-
title	Validation	01	No	No
then	Core	07	No	No
type	Validation	02	No	No
unevaluatedItems	Core	2019-09	No	No
unevaluatedProperties	Core	2019-09	No	No
uniqueItems	Assertion	02	Yes	No
writeOnly	Validation	07	No	No

For a detailed read-through about all the changes see each Draft migration guide.