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# Validators¶

Extbase brings a way to easily tell TYPO3 when a property is valid: by using annotations on class properties, Extbase will find which properties should be validated. To do so, you have to use the @validate annotation inside the phpDoc section of that property.

Of course, you can create and use any validator you want in your configuration object – if it does follow Extbase validator standards.

Example:

/**
* @var string
* @validate TYPO3\CMS\Extbase\Validation\Validator\NotEmptyValidator
*/
protected $name;  Tip To reduce the length of a @validate annotation, you can use the following shortcut naming convention: VendorName.ExtensionName:ValidatorName. Moreover, a validator from the core of Extbase can be used by writing only its name. Example /** * @var string * @validate NotEmpty * @validate EmailAddress * @validate MyVendor.MyExtension:Custom */ protected$email;


Please be aware that only validators which follow the Extbase validator naming convention can use the shortened notation:

1. The validator must be in the following namespace of your extension: Vendor\ExtensionName\Validation\Validator;
2. The validator class must end with Validator.

Oh, by the way, you can use this notation everywhere Extbase parses the @validate annotation, for instance in your controller or model classes. :-)

Parameters

Some validators may require parameters, for instance NumberRangeValidator from Extbase needs the following parameters: minimum and maximum. To do so, use the following notation:

/**
* @validate NumberRange(minimum: 0, maximum: 100)
*/


Multiple validators

You can attach several validators to the same property. For instance:

/**
* @var string
* @validate NotEmpty