How to create ,store and append data to json from unity using unity webplayer ?

Hi Every one , This is my first post in here and my apology for my English :).i am trying to create a small game in that i give some object to the player then player can create there own design like this Toy but as a 3D game for web and save it in web if they need to load the same design they can just click a button and recreate the same design when ever they want. so this is where i need help . How to store all the x,y,z position ,rotation ,scale of the GameObject in json and read that json file and recreate the design in web. plz help me with a example codes thank you :)