As I pointed out below, Amplify.js, an established Javascript library, has the Store module that supports all manner of browser storage (including userData) wit

As I pointed out below, Amplify.js, an established Javascript library, has the Store module that supports all manner of browser storage (including userData) with a unified interface that abstracts away the specific storage mechanism. http://amplifyjs.com/api/store/ http://amplifyjs.com/api/store/ I have nothing to do with that project but I hate to see people re-invent the wheel. ;-)