A fundamental part of Node's design is to create or fork processes when parallelizing execution or scaling a system, as opposed to creating a thread pool, for instance.

To create a child process, require Node's child_process module, and call the fork method. Pass the name of the program file the new process should execute:

// parent process
let cp = require('child_process');
let child = cp.fork(__dirname + '/child-process.js');

child.on('message', (m) => {
    console.log('child said: ', m); //Parent got a message up from our    child
});

child.send('I love you') //    Send    a    message    down    to    our    child

// child process
process.on('message', (m) => {
    console.log('parent said: ', m);
    process.send('I love you too');
});

ps -A | grep node

https://www.howtogeek.com/107217/how-to-manage-processes-from-the-linux-terminal-10-commands-you-need-to-know/

The following program will start a network server, fork a child process, and pass the server reference from the parent down to the child:

//    net-parent.js
const    path    =    require('path');
let    child    =    require("child_process").fork(path.join(__dirname,    "net-child.js"));
let    server    =    require("net").createServer();
server.on("connection",    (socket)    =>    {
        socket.end("Parent    handled    connection");
});
server.listen(8080,    ()    =>    {
        child.send("Parent    passing    down    server",    server);
});

//    net-child.js
process.on("message",    function(message,    server)    {
        console.log('net-child side: ', message);
        server.on("connection",    function(socket)    {
                socket.end("Child    handled    connection");
        });
});

// another client.js
let    net    =    require("net");
let    sock    =    net.connect(8088);
process.stdin.pipe(sock);
sock.pipe(process.stdout);