JAVASCRIPT

check in node whether the port is working or not

const net = require("net");
const Socket = net.Socket;

const getNextPort = async (port) => {
    return new Promise((resolve, reject) => {
        const socket = new Socket();

        const timeout = () => {
            resolve(port);
            socket.destroy();
        };

        const next = () => {
            socket.destroy();
            resolve(getNextPort(++port));
        };

        setTimeout(timeout, 200);
        socket.on("timeout", timeout);

        socket.on("connect", function () {
            next();
        });

        socket.on("error", function (exception) {
            if (exception.code !== "ECONNREFUSED") {
                reject(exception);
            } else {
                next();
            }
        });

        socket.connect(port, "0.0.0.0");
    });
};

getNextPort(8080).then(port => {
    console.log("port", port);
});