diff --git a/__enclave/virt_enclave/src/main.rs b/__enclave/virt_enclave/src/main.rs
index d12499d..4c369a5 100644
--- a/__enclave/virt_enclave/src/main.rs
+++ b/__enclave/virt_enclave/src/main.rs
@@ -70,7 +70,7 @@ async fn main() {
             result.insert("status", "400".to_owned());
             result.insert("message", "Script verify failed!".to_owned());
             result.insert("js_hash", format!("{}", js_hex));
-            return serde_json::to_string(&result).unwrap()
+            return serde_json::to_string_pretty(&result).unwrap()
         }
 
         let context = QuickJSContext::new().unwrap();
@@ -92,7 +92,7 @@ async fn main() {
                 result.insert("result", r.into_string().unwrap_or_else(|| "null".to_owned()));
             },
         }
-        return serde_json::to_string(&result).unwrap()
+        return serde_json::to_string_pretty(&result).unwrap()
     });
 
     println!("Listen at 127.0.0.1:8888 ...");