diff --git a/codes/javascript/include/PrintUtil.js b/codes/javascript/include/PrintUtil.js
index daeb24a7..3590f333 100644
--- a/codes/javascript/include/PrintUtil.js
+++ b/codes/javascript/include/PrintUtil.js
@@ -79,10 +79,10 @@ function showTrunks(p) {
     }
 
     showTrunks(p.prev);
-    console.log(p.str);
+    process.stdout.write(p.str);
 }
 
-module.exports = { 
+module.exports = {
     printTree,
     printLinkedList,
 }