it was async

Public/script.js

@@ -1,21 +1,20 @@
-function send(){
-
+async function send(){
   data={
     key:document.getElementById("key").value,
     upvote: document.getElementById("upvote").checked,
     downvote:document.getElementById("downvote").checked,
 
   }
-  let response = await fetch('http://localhost:9000/submit', {
+  let response = await fetch('/submit', {
     method: 'POST',
     headers: {
       'Content-Type': 'application/json;charset=utf-8'
     },
     body: JSON.stringify(data)
-  });
+  })
   
   let result = await response.json();
-  document.getElementById("input").innerHTML= result.message
+  document.getElementById("input").innerHTML=result.message
   
 
 }