--- /dev/null
+<?php
+
+namespace Drupal\serialization\Normalizer;
+
+/**
+ * Normalizes MarkupInterface objects into a string.
+ */
+class MarkupNormalizer extends NormalizerBase {
+
+ /**
+ * The interface or class that this Normalizer supports.
+ *
+ * @var array
+ */
+ protected $supportedInterfaceOrClass = ['Drupal\Component\Render\MarkupInterface'];
+
+ /**
+ * {@inheritdoc}
+ */
+ public function normalize($object, $format = NULL, array $context = []) {
+ return (string) $object;
+ }
+
+}