diff --git a/dataformat/json/classes/writer.php b/dataformat/json/classes/writer.php
index 8e3cfbad1df..599f3fee809 100644
--- a/dataformat/json/classes/writer.php
+++ b/dataformat/json/classes/writer.php
@@ -80,7 +80,7 @@ class writer extends \core\dataformat\base {
             echo ",";
         }
 
-        echo json_encode($record);
+        echo json_encode($record, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
 
         $this->sheetdatadded = true;
     }