Convert JS-style objects into proper JSON

jsonize.js

#!/usr/bin/env node
"use strict";
var fs = require("fs");
var vm = require("vm");

var sandbox = { value: null };
var context = vm.createContext(sandbox);

function convert(contents) {
  vm.runInContext('value = ' + contents, context);
  return JSON.stringify(sandbox.value);
}

var args = process.argv.slice(2);
if(args.length) {
  args.forEach(function(name) {
    var contents = fs.readFileSync(name);
    console.log(convert(contents));
  });
} else {
  var data = [];
  process.stdin.on('data', function(d) { data.push(d); });
  process.stdin.on('end', function() {
    var contents = data.join("");
    console.log(convert(contents));
  });
}