Get process stats with nodejs

let child_process = require("child_process");

let PID = 6991;

child_process.exec("ps --pid " + PID + " -o %cpu,rss,vsz,%mem", (error, stdout, stderr) => {
  // prepare data before send
  let txt = stdout.replace(/\n$/i, "").split("\n"); // remove the last \n and split by \n
  let lbltxt = txt[0].split(/\s+/g); // split by change space chars
  let datatxt = txt[1].replace(/^\s+/g, "").split(/\s+/g); // remove the first space chars and split by space chars
  console.log(stdout);
  console.log(txt);
  console.log(lbltxt);
  console.log(datatxt);
  let psinfo = {};
  for (let i = 0; i < lbltxt.length; i++) {
    console.log(i + " " + lbltxt[i] + " " + datatxt[i]);
    psinfo[lbltxt[i]] = datatxt[i];
  }
  console.log(psinfo);
});