Override localStorage and sessionStorage's getter and setter function to allow for objects/arrays to be stored as well.

json_storage.js

/* json_storage.js
 * @danott
 * 26 APR 2011
 *
 * Building on a thread from Stack Overflow, override localStorage and sessionStorage's
 * getter and setter functions to allow for storing objects and arrays.
 *
 * Original thread:
 * http://stackoverflow.com/questions/2010892/storing-objects-in-html5-localstorage
 */
Storage.prototype._setItem = Storage.prototype.setItem;
Storage.prototype.setItem = function(key, value)
{
  this._setItem(key, JSON.stringify(value));
}

Storage.prototype._getItem = Storage.prototype.getItem;
Storage.prototype.getItem = function(key)
{ 
  try
  {
    return JSON.parse(this._getItem(key));
  }
  catch(e)
  {
    return this._getItem(key);
  }
}