Validation Decorators¶

Common validation decorators¶

Decorator	Description
`@IsDefined(value: any)`	Checks if value is defined (!== undefined, !== null). This is the only decorator that ignores skipMissingProperties option.
`@IsOptional()`	Checks if given value is empty (=== null, === undefined) and if so, ignores all the validators on the property.
`@Equals(comparison: any)`	Checks if value equals ("===") comparison.
`@NotEquals(comparison: any)`	Checks if value not equal ("!==") comparison.
`@IsEmpty()`	Checks if given value is empty (=== '', === null, === undefined).
`@IsNotEmpty()`	Checks if given value is not empty (!== '', !== null, !== undefined).
`@IsIn(values: any[])`	Checks if value is in an array of allowed values.
`@IsNotIn(values: any[])`	Checks if value is not in an array of disallowed values.

Decorator	Description
`@IsBoolean()`	Checks if a value is a boolean.
`@IsDate()`	Checks if the value is a date.
`@IsString()`	Checks if the value is a string.
`@IsNumber(options: IsNumberOptions)`	Checks if the value is a number.
`@IsInt()`	Checks if the value is an integer number.
`@IsArray()`	Checks if the value is an array
`@IsEnum(entity: object)`	Checks if the value is a valid enum