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Validates that a value is a valid Universally unique identifier (UUID) per RFC 4122. By default, this will validate the format according to the RFC's guidelines, but this can be relaxed to accept non-standard UUIDs that other systems (like PostgreSQL) accept. UUID versions can also be restricted using a list of allowed versions.

Applies to property or method
Class Uuid
Validator UuidValidator

Basic Usage

  • Attributes
  • YAML
  • XML
  • PHP
// src/Entity/File.php
namespace App\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class File
    protected $identifier;


As with most of the other constraints, null and empty strings are considered valid values. This is to allow them to be optional values. If the value is mandatory, a common solution is to combine this constraint with NotBlank.



type: array | string

It defines the validation group or groups of this constraint. Read more about validation groups.


type: string default: This is not a valid UUID.

This message is shown if the string is not a valid UUID.

You can use the following parameters in this message:

Parameter Description
{{ value }} The current (invalid) value
{{ label }} Corresponding form field label


type: a PHP callable default: null

This option allows to define the PHP callable applied to the given value before checking if it is valid.

For example, you may want to pass the 'trim' string to apply the trim PHP function in order to ignore leading and trailing whitespace during validation.


type: mixed default: null

This option can be used to attach arbitrary domain-specific data to a constraint. The configured payload is not used by the Validator component, but its processing is completely up to you.

For example, you may want to use several error levels to present failed constraints differently in the front-end depending on the severity of the error.


type: boolean default: true

If this option is set to true the constraint will check if the UUID is formatted per the RFC's input format rules: 216fff40-98d9-11e3-a5e2-0800200c9a66. Setting this to false will allow alternate input formats like:

  • 216f-ff40-98d9-11e3-a5e2-0800-200c-9a66
  • {216fff40-98d9-11e3-a5e2-0800200c9a66}
  • 216fff4098d911e3a5e20800200c9a66


type: int[] default: [1,2,3,4,5,6]

This option can be used to only allow specific UUID versions. Valid versions are 1 - 6. The following PHP constants can also be used:

  • Uuid::V1_MAC
  • Uuid::V2_DCE
  • Uuid::V3_MD5
  • Uuid::V4_RANDOM
  • Uuid::V5_SHA1
  • Uuid::V6_SORTABLE

All six versions are allowed by default.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.
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