I only want a link from which I can make requests from server to frontend not want specific api’s.

If anyone know how to convert this below nodejs & express server into next.js backend server then please let me know.

Note:- When I host my next app, I also want to host backend side by side, so that frontend can simeltenisly use the backend api to connect users.

My server.js code:-

const express = require('express');
const cors = require("cors");
const { createServer } = require('http');
const app = express();
const server = createServer(app);
const io = require("socket.io")(server);
const { v4: uuidv4 } = require('uuid');
require("dotenv").config();

app.use(express.json());

app.use(cors());

const port = process.env.PORT || 5500;

app.get('/', (req, res) => {
    res.send(`Backend is running, congrats ${Date()}`)
})

let users = [];

io.on("connection", socket => {
    socket.on("new-user", () => {
        const generatedUUID = uuidv4();
        let remote_peer_id = searchForPeer(generatedUUID);
        //logic
        socket.emit("new-user", { peer_id: generatedUUID, remote_peer_id });

        console.log(`A user connected (peer id: ${generatedUUID}`);
    })

    socket.on("stop", () => {
        let remote_peer_id = null;
        //logic
    })



    socket.on("start", () => {
        //logic
    })

    socket.on("next", () => {
        let remote_peer_id = null;
        //logic
    })

    socket.on("disconnect", () => {
        let remote_peer_id = null;
        //logic
    })
})

function onPeerDisconnect(user_peer_id) {
    const index = users.findIndex(user => user.peer_id === user_peer_id);
    if (index !== -1) {
        const { peer_id, socket_id } = users[index];
        const new_remote_peer_id = searchForPeer(peer_id);
        users[index].remote_peer_id = new_remote_peer_id;
        io.to(socket_id).emit("peer-disconnected", { new_remote_peer_id });
    }
}

function searchForPeer(user_peer_id) {
    let found = null;
    for (let i = 0; i < users.length; i++) {
        const { started, peer_id, remote_peer_id } = users[i];

        if (started === true && remote_peer_id === null && peer_id !== user_peer_id) {
            users[i].remote_peer_id = user_peer_id;
            found = peer_id;
            break;
        }
    }
    return found;
}

server.listen(port, () => console.log(`???? Server is now running on port ${port}`));

Accutally I am new in nextjs for running backend with frontend but I have watched so many tutorials but didn’t find the solution.