Node form field validation

/**
 * Implements hook_entity_bundle_field_info_alter().
 */
#[Hook('entity_bundle_field_info_alter')]
public function entityBundleFieldInfoAlter(&$fields, EntityTypeInterface $entity_type, $bundle) {
  if ($entity_type->id() === 'node' && $bundle === 'animal' && isset($fields['field_chip_number'])) {
    $fields['field_chip_number']->addPropertyConstraints('value', [
      'Length' => [
        'min' => 15,
        'max' => 15,
        'exactMessage' => $this->t('The value must contain exactly %limit characters.'),
      ],
    ]);
  }
}