Experiment with stringifyJSON.

stringy.js

// this is what you would do if you liked things to be easy:
// var stringifyJSON = JSON.stringify;

// but you don't so you're going to write it from scratch:

var stringifyJSON = function(obj) {
 
  if (obj===null) {
    return 'null';
  } else if (typeof obj === 'number' || 'boolean') {
    return obj.toString();
  } else if (typeof obj === 'string') {
    return '"' + obj + '"';
  } else if (Array.isArray(obj)) {
    var arrayString = "[";
    for (var i=0; i<obj.length; i++) {
      if (i) {
        arrayString += ","
      }
      arrayString += stringifyJSON(obj[i]);
    }
    arrayString += "]";
    return arrayString;
  } else if (obj.contructor === Object) {
    var hashItems = [];
    for (var key in obj) {
      if (typeof obj[key] === 'function') {
        return "";
      }
      hashItems.push('"'+key+'":'+stringifyJSON(obj[key]));
    }
    return "{" + hashItems.join(',') + "}"
  } else {
    return "";
  }

};