diff --git a/app.js b/app.js
index c6cb454..8ceceb6 100644
--- a/app.js
+++ b/app.js
@@ -5,6 +5,7 @@ import ServeDrive from 'serve-drive';
 import Hyperdrive from 'hyperdrive';
 import Corestore from 'corestore';
 import { EventEmitter } from 'events';
+import fs from "fs";
 
 const storagePath = `./storage/storage_${Date.now()}_${Math.random().toString(36).substring(2, 15)}`;
 const store = new Corestore(storagePath);
@@ -13,8 +14,6 @@ const drive = new Hyperdrive(store);
 await drive.ready();
 
 let swarm;
-let userName = 'Anonymous';
-let userAvatar = '';
 let registeredUsers = JSON.parse(localStorage.getItem('registeredUsers')) || {};
 let peerCount = 0;
 let currentRoom = null;
@@ -23,6 +22,13 @@ const eventEmitter = new EventEmitter();
 // Define servePort at the top level
 let servePort;
 
+// Object to store all the information we want to save
+let config = {
+  userName: '',
+  userAvatar: '',
+  rooms: []
+};
+
 // Function to get a random port between 1337 and 2223
 function getRandomPort() {
   return Math.floor(Math.random() * (65535 - 49152 + 1)) + 49152;
@@ -82,15 +88,24 @@ async function initialize() {
           const filePath = `/files/${file.name}`;
           await drive.put(filePath, buffer);
           const fileUrl = `http://localhost:${servePort}${filePath}`;
-          sendFileMessage(userName, fileUrl, file.type, userAvatar);
+          sendFileMessage(config.userName, fileUrl, file.type, config.userAvatar);
         };
         reader.readAsArrayBuffer(file);
       }
     });
   }
 
+  const configExists = fs.existsSync("./config.json");
+  if (configExists) {
+    config = JSON.parse(fs.readFileSync("./config.json", 'utf8'));
+    console.log("Read config from file:", config)
+    config.rooms.forEach(room => {
+      addRoomToListWithoutWritingToConfig(room);
+    });
+  }
+
   const registerDiv = document.querySelector('#register');
-  if (registerDiv) {
+  if (registerDiv && !configExists) {
     registerDiv.classList.remove('hidden');
   }
 
@@ -113,11 +128,11 @@ async function initialize() {
     console.log('Peer connected, current peer count:', peerCount);
 
     // Send the current user's icon to the new peer
-    const iconBuffer = await drive.get(`/icons/${userName}.png`);
+    const iconBuffer = await drive.get(`/icons/${config.userName}.png`);
     if (iconBuffer) {
       const iconMessage = JSON.stringify({
         type: 'icon',
-        username: userName,
+        username: config.userName,
         avatar: iconBuffer.toString('base64'),
       });
       connection.write(iconMessage);
@@ -159,8 +174,8 @@ function registerUser(e) {
     reader.onload = async (event) => {
       const buffer = new Uint8Array(event.target.result);
       await drive.put(`/icons/${regUsername}.png`, buffer);
-      userAvatar = `http://localhost:${servePort}/icons/${regUsername}.png`; // Set the correct URL
-      registeredUsers[regUsername] = userAvatar;
+      config.userAvatar = `http://localhost:${servePort}/icons/${regUsername}.png`; // Set the correct URL
+      registeredUsers[regUsername] = config.userAvatar;
       localStorage.setItem('registeredUsers', JSON.stringify(registeredUsers));
       continueRegistration(regUsername);
     };
@@ -179,13 +194,15 @@ async function continueRegistration(regUsername) {
     return;
   }
 
-  userName = regUsername;
+  config.userName = regUsername;
   setupDiv.classList.remove('hidden');
   document.querySelector('#register').classList.add('hidden');
   loadingDiv.classList.add('hidden');
 
   const randomTopic = crypto.randomBytes(32);
   document.querySelector('#chat-room-topic').innerText = truncateHash(b4a.toString(randomTopic, 'hex'));
+
+  writeConfigToFile("./config.json");
 }
 
 async function createChatRoom() {
@@ -230,6 +247,18 @@ function addRoomToList(topic) {
   roomItem.dataset.topic = topic;
   roomItem.addEventListener('click', () => switchRoom(topic));
   roomList.appendChild(roomItem);
+
+  config.rooms.push(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) {
@@ -249,6 +278,9 @@ function leaveRoom() {
   }
   document.querySelector('#chat').classList.add('hidden');
   document.querySelector('#setup').classList.remove('hidden');
+
+  config.rooms = config.rooms.filter(e => e !== currentRoom.topic);
+  writeConfigToFile("./config.json");
 }
 
 function sendMessage(e) {
@@ -256,13 +288,13 @@ function sendMessage(e) {
   const message = document.querySelector('#message').value;
   document.querySelector('#message').value = '';
 
-  onMessageAdded(userName, message, userAvatar);
+  onMessageAdded(config.userName, message, config.userAvatar);
 
   const messageObj = JSON.stringify({
     type: 'message',
-    name: userName,
+    name: config.userName,
     message,
-    avatar: userAvatar,
+    avatar: config.userAvatar,
     timestamp: Date.now(),
   });
 
@@ -381,6 +413,9 @@ async function updateIcon(username, avatarBuffer) {
     const avatarBlob = new Blob([avatarBuffer], { type: 'image/png' });
     const avatarUrl = URL.createObjectURL(avatarBlob);
     userIcon.src = avatarUrl;
+
+    config.userAvatar = avatarUrl;
+    writeConfigToFile("./config.json");
   }
 }
 
@@ -396,4 +431,11 @@ function toggleSetupView() {
   setupDiv.classList.toggle('hidden');
 }
 
+function writeConfigToFile(filePath) {
+  fs.writeFile(filePath, JSON.stringify(config), (err) => {
+    if (err) return console.error(err);
+    console.log("File has been created");
+  });
+}
+
 initialize();