diff --git a/Data/js/main.js b/Data/js/main.js
index b163cec..54bbc7c 100644
--- a/Data/js/main.js
+++ b/Data/js/main.js
@@ -232,7 +232,8 @@ function mintNFT(funId, address, tokenIds, startTime, saltNonce, signature) {
       startTime,
       saltNonce,
       signature,
-    })
+    }),
+    (v) => JSON.stringify(v)
   );
 }
 // ======= end of interact with contract =======