diff --git a/html/main.js b/html/main.js
index d3bba48..7985509 100644
--- a/html/main.js
+++ b/html/main.js
@@ -48,7 +48,7 @@ function testDate(){
 }
 
 function showStringObj(){
-  alert(JSONfn.stringify(jsonfnObj));
+  alert(JSONfn.stringify(jsonfnObj, '\t'));
 }
 
 
diff --git a/jsonfn.js b/jsonfn.js
index 7f974c7..19f95f6 100644
--- a/jsonfn.js
+++ b/jsonfn.js
@@ -32,7 +32,7 @@
 
 (function (exports) {
 
-  exports.stringify = function (obj) {
+  exports.stringify = function (obj, space) {
 
     return JSON.stringify(obj, function (key, value) {
       if (value instanceof Function || typeof value == 'function') {
@@ -42,7 +42,7 @@
         return '_PxEgEr_' + value;
       }
       return value;
-    });
+    }, space);
   };
 
   exports.parse = function (str, date2obj) {