diff --git a/core/modules/serialization/src/Normalizer/EntityReferenceFieldItemNormalizer.php b/core/modules/serialization/src/Normalizer/EntityReferenceFieldItemNormalizer.php
index 846d883..887288f 100644
--- a/core/modules/serialization/src/Normalizer/EntityReferenceFieldItemNormalizer.php
+++ b/core/modules/serialization/src/Normalizer/EntityReferenceFieldItemNormalizer.php
@@ -27,12 +27,18 @@ class EntityReferenceFieldItemNormalizer extends ComplexDataNormalizer {
   public function normalize($field_item, $format = NULL, array $context = []) {
     $values = parent::normalize($field_item, $format, $context);
 
-    // Add a 'url' value if there is a reference and a canonical URL. Hard code
-    // 'canonical' here as config entities override the default $rel parameter
-    // value to 'edit-form.
     /** @var \Drupal\Core\Entity\EntityInterface $entity */
-    if (($entity = $field_item->get('entity')->getValue()) && ($url = $entity->url('canonical'))) {
-      $values['url'] = $url;
+    if ($entity = $field_item->get('entity')->getValue()) {
+      $values['target_type'] = $entity->getEntityTypeId();
+      // Add the target entity UUID to the normalized output values.
+      $values['target_uuid'] = $entity->uuid();
+
+      // Add a 'url' value if there is a reference and a canonical URL. Hard
+      // code 'canonical' here as config entities override the default $rel
+      // parameter value to 'edit-form.
+      if ($url = $entity->url('canonical')) {
+        $values['url'] = $url;
+      }
     }
 
     return $values;
diff --git a/core/modules/serialization/src/Tests/EntitySerializationTest.php b/core/modules/serialization/src/Tests/EntitySerializationTest.php
index 1dbc51c..16ba970 100644
--- a/core/modules/serialization/src/Tests/EntitySerializationTest.php
+++ b/core/modules/serialization/src/Tests/EntitySerializationTest.php
@@ -115,6 +115,8 @@ public function testNormalize() {
       'user_id' => array(
         array(
           'target_id' => $this->user->id(),
+          'target_type' => $this->user->getEntityTypeId(),
+          'target_uuid' => $this->user->uuid(),
           'url' => $this->user->url(),
         ),
       ),
@@ -189,7 +191,7 @@ public function testSerialize() {
       'name' => '<name><value>' . $this->values['name'] . '</value></name>',
       'type' => '<type><value>entity_test_mulrev</value></type>',
       'created' => '<created><value>' . $this->entity->created->value . '</value></created>',
-      'user_id' => '<user_id><target_id>' . $this->user->id() . '</target_id><url>' . $this->user->url() . '</url></user_id>',
+      'user_id' => '<user_id><target_id>' . $this->user->id() . '</target_id><target_type>' . $this->user->getEntityTypeId() . '</target_type><target_uuid>' . $this->user->uuid() . '</target_uuid><url>' . $this->user->url() . '</url></user_id>',
       'revision_id' => '<revision_id><value>' . $this->entity->getRevisionId() . '</value></revision_id>',
       'default_langcode' => '<default_langcode><value>1</value></default_langcode>',
       'field_test_text' => '<field_test_text><value>' . $this->values['field_test_text']['value'] . '</value><format>' . $this->values['field_test_text']['format'] . '</format></field_test_text>',
diff --git a/core/modules/serialization/tests/src/Unit/Normalizer/EntityReferenceFieldItemNormalizerTest.php b/core/modules/serialization/tests/src/Unit/Normalizer/EntityReferenceFieldItemNormalizerTest.php
index c0c2e9f..510fa87 100644
--- a/core/modules/serialization/tests/src/Unit/Normalizer/EntityReferenceFieldItemNormalizerTest.php
+++ b/core/modules/serialization/tests/src/Unit/Normalizer/EntityReferenceFieldItemNormalizerTest.php
@@ -78,6 +78,12 @@ public function testNormalize() {
     $entity->url('canonical')
       ->willReturn($test_url)
       ->shouldBeCalled();
+    $entity->uuid()
+      ->willReturn('080e3add-f9d5-41ac-9821-eea55b7b42fb')
+      ->shouldBeCalled();
+    $entity->getEntityTypeId()
+      ->willReturn('test_type')
+      ->shouldBeCalled();
 
     $entity_reference = $this->prophesize(TypedDataInterface::class);
     $entity_reference->getValue()
@@ -92,6 +98,8 @@ public function testNormalize() {
 
     $expected = [
       'target_id' => ['value' => 'test'],
+      'target_type' => 'test_type',
+      'target_uuid' => '080e3add-f9d5-41ac-9821-eea55b7b42fb',
       'url' => $test_url,
     ];
     $this->assertSame($expected, $normalized);