Create chat.js

public/chat.js

@@ -0,0 +1,23 @@
+const socket = io();
+
+const urlParams = new URLSearchParams(window.location.search);
+const roomId = urlParams.get("room");
+const name = urlParams.get("name");
+
+document.getElementById("roomTitle").innerText = "Room: " + roomId;
+
+socket.emit("join-room", { roomId, name });
+
+socket.on("message", (data) => {
+  const chat = document.getElementById("chat");
+  chat.innerHTML += `<p><b>${data.name}:</b> ${data.text}</p>`;
+  chat.scrollTop = chat.scrollHeight;
+});
+
+function send() {
+  const msgInput = document.getElementById("msg");
+  const msg = msgInput.value;
+  if (!msg) return;
+  socket.emit("send-message", msg);
+  msgInput.value = "";
+}