diff -u b/src/Plugin/Field/FieldFormatter/RawValueFormatter.php b/src/Plugin/Field/FieldFormatter/RawValueFormatter.php
--- b/src/Plugin/Field/FieldFormatter/RawValueFormatter.php
+++ b/src/Plugin/Field/FieldFormatter/RawValueFormatter.php
@@ -9,6 +9,7 @@
 
 use Drupal\Core\Field\FormatterBase;
 use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Component\Utility\Html;
 use Drupal\Core\TypedData\Plugin\DataType\StringData;
 
 /**
@@ -31,10 +32,14 @@
     $elements = array();
     foreach ($items as $delta => $item) {
       $value = $item->getValue();
-      $val = json_encode(unserialize($value['value']));
+      $value = unserialize($value['value']);
+      foreach($value as $key => $val){
+        $arr[$key] = Html::escape($val);
+      }
+      $values = json_encode($arr);
       $elements[$delta] = array(
         '#theme' => 'raw_formatter',
-        '#raw_value' => $val,
+        '#raw_value' => $values,
       );
     }
     return $elements;