Sungani is a web api and toolset for saving mobile and web games. It handles the server, you can concentrate on the game itself. These are the libraries that handle savegames for javascript web games.
For API documentation visit: www.sungani.com/developers/api/Home
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jquery
Comes with a small eventing library called MicroEvent. This is included for convenience: notes.jetienne.com/2011/03/22/microeventjs.html
The library is licensed under the MIT license.