Working.

server.js

@@ -0,0 +1,27 @@
+const io = require("socket.io")(3000, {
+    cors: {
+        origin: [
+            "http://localhost:5500",
+            "http://127.0.0.1:5500",
+            "http//192.168.1.226:5500",
+        ],
+    },
+})
+
+const users = {}
+
+io.on("connection", (socket) => {
+    socket.on("new-user", (name) => {
+        users[socket.id] = name
+        socket.broadcast.emit("user-connected", name)
+    })
+
+    socket.on("send-chat-message", (message) =>
+        socket.broadcast.emit("chat-message", message, users[socket.id])
+    )
+
+    socket.on("disconnect", () => {
+        socket.broadcast.emit("user-disconnected", users[socket.id])
+        delete users[socket.id]
+    })
+})