diff --git a/week5/jonah_qian/index.html b/week5/jonah_qian/index.html
new file mode 100644
index 00000000..a0b5815a
--- /dev/null
+++ b/week5/jonah_qian/index.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Socket.IO chat</title>
+    <style>
+      body { margin: 0; padding-bottom: 3rem; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
+
+      #form { background: rgba(0, 0, 0, 0.15); padding: 0.25rem; position: fixed; bottom: 0; left: 0; right: 0; display: flex; height: 3rem; box-sizing: border-box; backdrop-filter: blur(10px); }
+      #input { border: none; padding: 0 1rem; flex-grow: 1; border-radius: 2rem; margin: 0.25rem; }
+      #input:focus { outline: none; }
+      #form > button { background: #333; border: none; padding: 0 1rem; margin: 0.25rem; border-radius: 3px; outline: none; color: #fff; }
+
+      #messages { list-style-type: none; margin: 0; padding: 0; }
+      #messages > li { padding: 0.5rem 1rem; }
+      #messages > li:nth-child(odd) { background: #efefef; }
+    </style>
+  </head>
+  <body>
+    <ul id="messages"></ul>
+    <form id="form" action="">
+      <input id="input" autocomplete="off" /><button>Send</button>
+    </form>
+    <script src="/socket.io/socket.io.js"></script>
+    <script>
+        var socket = io();
+
+        var messages = document.getElementById('messages');
+        var form = document.getElementById('form');
+        var input = document.getElementById('input');
+
+        form.addEventListener('submit', function(e) {
+            e.preventDefault();
+            if (input.value) {
+                socket.emit('chat message', input.value);
+                input.value = '';
+            }
+        });
+
+        socket.on('chat message', function(msg) {
+            var item = document.createElement('li');
+            item.textContent = msg;
+            messages.appendChild(item);
+            window.scrollTo(0, document.body.scrollHeight);
+        });
+    </script>
+  </body>
+</html>
diff --git a/week5/jonah_qian/index.js b/week5/jonah_qian/index.js
new file mode 100644
index 00000000..10f93371
--- /dev/null
+++ b/week5/jonah_qian/index.js
@@ -0,0 +1,30 @@
+const express = require('express');
+const app = express();
+const http = require('http');
+const server = http.createServer(app);
+const { Server } = require("socket.io");
+const io = new Server(server);
+
+app.get('/', (req, res) => {
+  res.sendFile(__dirname + '/index.html');
+});
+
+io.on('connection', (socket) => {
+  console.log('a user connected');
+});
+
+io.on('connection', (socket) => {
+    socket.on('chat message', (msg) => {
+      console.log('message: ' + msg);
+    });
+});
+
+io.on('connection', (socket) => {
+    socket.on('chat message', (msg) => {
+      io.emit('chat message', msg);
+    });
+});
+
+server.listen(3000, () => {
+  console.log('listening on *:3000');
+});
diff --git a/week5/jonah_qian/package.json b/week5/jonah_qian/package.json
new file mode 100644
index 00000000..3b17082d
--- /dev/null
+++ b/week5/jonah_qian/package.json
@@ -0,0 +1,6 @@
+{
+    "name": "socket-chat-example",
+    "version": "0.0.1",
+    "description": "my first socket.io app",
+    "dependencies": {}
+}
diff --git a/week5/jonah_qian/style.css b/week5/jonah_qian/style.css
new file mode 100644
index 00000000..4a95fe7a
--- /dev/null
+++ b/week5/jonah_qian/style.css
@@ -0,0 +1,10 @@
+#grad {
+    background-image: linear-gradient(rgb(247, 202, 201), rgb(255, 193, 150));
+}
+body {
+    text-align: center;
+    font-family: 'Times New Roman';
+    font-weight: bold;
+    background-image: linear-gradient(rgb(247, 202, 201), rgb(146, 168, 209));
+    color: brown;
+}
