--- /dev/null
+<?php
+
+namespace Drupal\metatag\Normalizer;
+
+use Drupal\serialization\Normalizer\NormalizerBase;
+
+/**
+ * Converts the Metatag field item object structure to METATAG array structure.
+ */
+class FieldItemNormalizer extends NormalizerBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected $supportedInterfaceOrClass = 'Drupal\metatag\Plugin\Field\FieldType\MetatagFieldItem';
+
+ /**
+ * {@inheritdoc}
+ */
+ public function normalize($field_item, $format = NULL, array $context = []) {
+ $values = $field_item->getValue();
+
+ $normalized['value'] = unserialize($values['value']);
+
+ return $normalized;
+ }
+
+}