diff --git a/core/lib/Drupal/Core/StringTranslation/TranslatableString.php b/core/lib/Drupal/Core/StringTranslation/TranslatableString.php
index 6704a6f..01e8969 100644
--- a/core/lib/Drupal/Core/StringTranslation/TranslatableString.php
+++ b/core/lib/Drupal/Core/StringTranslation/TranslatableString.php
@@ -157,6 +157,16 @@ public function __sleep() {
   }
 
   /**
+   * Returns a representation of the object for use in JSON serialization.
+   *
+   * @return string
+   *   The safe string content.
+   */
+  public function jsonSerialize() {
+    return $this->__toString();
+  }
+
+  /**
    * Gets the string translation service.
    *
    * @return \Drupal\Core\StringTranslation\TranslationInterface