if (process.pid) {
  console.log('This process is your pid ' + process.pid);
}

console.log('This platform is ' + process.platform);

var exec = require('child_process').exec;
var yourPID = '1444';

exec('tasklist', function(err, stdout, stderr) {
    var lines = stdout.toString().split('n');
    var results = new Array();
    lines.forEach(function(line) {
        var parts = line.split('=');
        parts.forEach(function(items){
        if(items.toString().indexOf(yourPID) > -1){
        console.log(items.toString().substring(0, items.toString().indexOf(yourPID)));
         }
        })
    });
});

var spawn = require('child_process').spawn,
    cmdd = spawn('your_command'); //something like: 'man ps'

cmdd.stdout.on('data', function (data) {
  console.log('' + data);
});
cmdd.stderr.setEncoding('utf8');
cmdd.stderr.on('data', function (data) {
  if (/^execvp()/.test(data)) {
    console.log('Failed to start child process.');
  }
});

var process = require('process'); but it gave error.

console.log('This process is your pid ' + process.pid);

process.title = 'node-chat'

ps -aux | grep node-chat