index.js

const express = require("express");
const app = express();
const handlebars = require("express-handlebars");
const http = require("http").Server(app);
const io = require("socket.io")(http, {
    cors: {
        origin: "*",
        methods: ["GET", "POST"],
    },
});

//To holding users information
const socketsStatus = {};

//config and set handlebars to express
const customHandlebars = handlebars.create({ layoutsDir: "./views" });

app.engine("handlebars", customHandlebars.engine);
app.set("view engine", "handlebars");

//enable user access to public folder
app.use("/files", express.static("public"));

app.get("/", (req, res) => {
    res.render("index");
});

http.listen(3000, () => {
    io.on("connection", function (socket) {
        const socketId = socket.id;
        socketsStatus[socket.id] = {};

        console.log("connect");

        socket.on("voice", function (data) {
            var newData = data.split(";");
            newData[0] = "data:audio/ogg;";
            newData = newData[0] + newData[1];

            for (const id in socketsStatus) {
                if (
                    id != socketId &&
                    !socketsStatus[id].mute &&
                    socketsStatus[id].online
                )
                    socket.broadcast.to(id).emit("send", newData);
            }
        });

        socket.on("userInformation", function (data) {
            socketsStatus[socketId] = data;

            io.sockets.emit("usersUpdate", socketsStatus);
        });

        socket.on("disconnect", function () {
            delete socketsStatus[socketId];
        });
    });

    console.log("the app is run in port 3000!");
});