whatever.js

var spawn = require('child_process').spawn,
    ls    = spawn('pcsc_scan', []);
var util = require('util');
var atrfound = false;

console.log("pcsc_scan should be running now");
ls.stdout.on('data', function (data) {
  //console.log('stdout: ' + data);
  var data = data.toString();
  data = data.replace(/\u001b\[\d{0,2}m/g, ''); // Remove ANSI colors.
  var state = /Card state: Card (.+),/.exec(data);

  if (state) {
    state = state[1];
    if (state == "inserted") {

    }
    if (state == "removed") {
      atrfound = false;
    }
    console.log("Card state is: " + state);
  }
  // lets try to read a UID.
  var atr = /ATR: (.+)/.exec(data);
  if (atr && !atrfound) {
    atr = atr[1];
    atrfound = true;
    console.log("ATR: " + atr);
  }

});

ls.stderr.on('data', function (data) {
  //console.log('stderr: ' + data);
});