Update index.js

index.js

@@ -115,9 +115,9 @@ app.get(
     next()
   },
   async (req, res) => {
-    const [cmd = 'w', ...args] = req
+    const [cmd, ...args] = req
       .query
-      .cmd
+      .cmd?
       .trim()
       .split(' ')
     const file = format(