Validation Rules Reference

Complete reference for field-level validation rules including string, numeric, boolean, array, and object rules.

January 23, 2026

Field-level validation rules protect data integrity. The editor includes a comprehensive set of validation rules organised by field type.

General Rules (All Types)

Rules applicable to all field types
Rule	Description
required	Field must be present
nullable	Allow null values
const	Must equal specific value
enum	Value in allowed list
notEnum	Value not in list
format	Must match format
type	Type validation
custom	Custom expression

String Rules

Numeric Rules

Numeric validation rules
Rule	Description
min	Minimum value (inclusive)
max	Maximum value (inclusive)
exclusiveMin	Minimum value (exclusive)
exclusiveMax	Maximum value (exclusive)
range	Value in range
positive	Must be positive
nonNegative	Must be zero or positive
negative	Must be negative
nonPositive	Must be zero or negative
multipleOf	Must be multiple of value

Boolean Rules

Boolean validation rules
Rule	Description
required	Must be present
mustBeTrue	Must be true
mustBeFalse	Must be false
const	Must equal specific value

Array Rules

Array validation rules
Rule	Description
minItems	Minimum array length
maxItems	Maximum array length
uniqueItems	All items must be unique
contains	Must contain specific item
allowEmpty	Allow empty arrays

Object Rules

Object validation rules
Rule	Description
minProperties	Minimum property count
maxProperties	Maximum property count
requiredProperty	Specific property required
forbiddenProperty	Specific property forbidden
propertyPattern	Property names must match pattern
dependencies	Property dependencies

Validation Message

Validation message properties
Property	Description
text	Human-readable message
code	Internal error code
httpStatusCode	HTTP status (400, 422, etc.)
catalogKey	i18n key for translation
severity	error, warning, or info
properties	Free-form metadata