convert xml to json nodejs command line utility

xml2json.js

#!/usr/bin/env node
var parser = require('xml2json');
var fs = require('fs');

function onFile(err, data) {
  if (err) {
    console.log('Uh oh: ' + err);
    return;
  }
  var json = parser.toJson(data);
    fs.writeFile(fpath.replace('.xml','.json'), json, function (err) {
      if (err) throw err;
      console.log(fpath.replace('.xml','.json') + ' saved!');
    })
}
var fpath = process.argv[2];
var xml = fs.readFile(fpath, 'utf8',onFile);