NodeJS, Socket.io - The websocket getting disconnected immediately after getting connected - node.js

Question

I have my backend in NodeJS and frontend in NextJS. As soon I try to connect with the server for a WebSocket connection, the server connects the socket and immediately disconnects it.
This is what I get on my server as soon as I reload my frontend page:
user connected ---- OKGG9r0qvvBs0EWeAAAB test#test.com socket disconnected--- OKGG9r0qvvBs0EWeAAAB test#test.com
This is my server code:
import express from "express";
import dotenv from "dotenv";
import http from "http";
import { Server, Socket } from "socket.io";
import userRoutes from "./routes/users";
import { DefaultEventsMap } from "socket.io/dist/typed-events";
dotenv.config();
const PORT = process.env.PORT || 5000;
const app = express();
const server = http.createServer(app);
const io = new Server(server, {
cors: {
origin: process.env.CLIENT_URL,
},
});
app.use(express.json());
app.get("/ping", (req, res) => res.status(200).send("Pong"));
app.use((req, res, next) => {
res.header("Access-Control-Allow-Origin", "http://localhost:3000");
res.header("Access-Control-Allow-Credentials", "true");
res.header("Access-Control-Allow-Methods", "POST, GET");
res.header(
"Access-Control-Allow-Headers",
"Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With"
);
next();
});
interface SType extends Socket {
email?: string;
}
io.use((socket: SType, next) => {
const userEmail = socket.handshake.auth.email;
if (!userEmail) {
return next(new Error("Invalid email"));
}
console.log("userEmail-----", userEmail);
socket.email = userEmail;
next();
});
io.on("connection", (socket) => {
const users = [];
for (let [id, socket] of io.of("/").sockets) {
users.push({
userID: id,
email: (socket as any).email,
});
socket.emit("users", users);
}
socket.broadcast.emit("user connected", {
userID: socket.id,
email: (socket as any).email,
});
console.log("user connected ---- ", socket.id, (socket as any).email);
socket.on("disconnect", () => {
console.log("socket disconnected---", socket.id, (socket as any).email);
(socket as any).email = "";
});
});
app.use("/users", userRoutes);
server.listen(PORT, () => console.log(`server running on port ${PORT}`));
this is code on client side
useEffect(() => {
if (userState) {
socket.auth = { email: userState.email };
}
}, [userState]);
useEffect(() => {
socket.on("users", (users: any) => {
console.log("users", users);
setUsers(users);
});
socket.on("user connected", (user: any) => {
setUsers((previousState: any) => [...previousState, user]);
});
}, [socket]);
I tried the solutions from stack overflow as well as socket.io documentation, but nothing seems to work. Does anyone know what is happening here?