It acutally works just fine now yay

app.js

@@ -100,7 +100,7 @@ async function initialize() {
     config = JSON.parse(fs.readFileSync("./config.json", 'utf8'));
     console.log("Read config from file:", config)
     config.rooms.forEach(room => {
-      addRoomToList(room);
+      addRoomToListWithoutWritingToConfig(room);
     });
   }
 
@@ -252,6 +252,15 @@ function addRoomToList(topic) {
   writeConfigToFile("./config.json");
 }
 
+function addRoomToListWithoutWritingToConfig(topic) {
+  const roomList = document.querySelector('#room-list');
+  const roomItem = document.createElement('li');
+  roomItem.textContent = truncateHash(topic);
+  roomItem.dataset.topic = topic;
+  roomItem.addEventListener('click', () => switchRoom(topic));
+  roomList.appendChild(roomItem);
+}
+
 function switchRoom(topic) {
   const topicBuffer = b4a.from(topic, 'hex');
   joinSwarm(topicBuffer);