Node.JS Simple Port Opening ( For NAT Testing )

open-port.js

const net = require( 'net' );
const process = require( 'process' );

const [ nodePath , scriptPath , port ] = process.argv;

if ( port === undefined ) {
    console.error( 'Port not defined' );
    return;
}

const server = net.createServer(( client ) => {
    
    console.log( `New Connection from ${client.remoteAddress}:${client.remotePort}` );

    client.end('Hi !! ( Masoud Zohrabi <[email protected]> )');

});

server.listen( { host: '0.0.0.0' , port: port } , () => {

    var { address , port } = server.address();

    console.log( `Server started on ${address}:${port}` );

});