Running command from Node.js by spawning a new process

running.command.node.js

var spawn = require('child_process').spawn;

function spawnProcess(dir, cmd) {
  return (process.platform.toLowerCase().indexOf("win") >= 0) 
    ? spawnWindowsProcess(dir, cmd)
    : spawnLinuxProcess(dir, cmd);
}

function spawnWindowsProcess(dir, cmd) {
  return spawn("cmd.exe", ["/c", cmd], {cwd: dir});
}

function spawnLinuxProcess(dir, cmd) {
  var cmdParts = cmd.split(/\s+/);

  return spawn(cmdParts[0], cmdParts.slice(1), { cwd: dir});
}

function runCmdHandler(dir, cmd) {
  var process = null;

  try {
    process = spawnProcess(dir, cmd);
  } catch (e) {
    console.error("Error trying to execute command '" + cmd + "' in directory '" + dir + "'");
    console.error(e);
    console.log("error", e.message);
    console.log("finished");
    return;
  }

  process.stdout.on('data', function (data) {
    console.log("progress", data.toString('utf-8'));
  });

  process.stderr.on('data', function (data) {
    console.log("error", data.toString('utf-8'));
  });

  process.on('exit', function (code) {
    console.log("finished");
  });
}

/*
 * Example commands.
 */
runCmdHandler(".", "find . -name '*.js'");
runCmdHandler(".", "uname -a");
runCmdHandler(".", "ls -lh .");
runCmdHandler("/home/anton/src/github/grunt-prepr", "grunt");
runCmdHandler(".", "git clone https://github.com/antivanov/Brackets-Command-Line-Shortcuts");

the template with space inside "cmd" somehow unable to read ?
eg:
what i run in my cmd is : ffmpeg -y -f dshow -i video="Webcam C170" -codec:v libx264 -qp 0 -t 0:00:05 createvideo.mp4

so it's goin to be:
runCmdHandler(".", "ffmpeg -y -f dshow -i video="+"Webcam C170"+" -codec:v libx264 -qp 0 -t 0:00:05 createvideo.mp4");

somehow it only write Webcam through nodejs, while it perfectly fine when i do manually in cmd line?
do u have any idea please ?

Don't know for the windows part but for Unix like system, line https://gist.github.com/antivanov/20ee20b7a40995b1836c#file-running-command-node-js-L14 will split command arguments on any space chars encountered therefore your error
Please note also that the embedded double-quotes might also lead to further misbehaviours
one easy but dirty way would be to try something like
runCmdHandler(".", "ffmpeg -y -f dshow -i video=\x22Webcam\x20C170\x22 -codec:v libx264 -qp 0 -t 0:00:05 createvideo.mp4");