That actually sounds like what Firebase (https://www.firebase.com/ https://www.firebase.com/) offers, but that's a service not a library. You might want to hav

That actually sounds like what Firebase (https://www.firebase.com/ https://www.firebase.com/) offers, but that's a service not a library. You might want to have a look at http://pouchdb.com/ http://pouchdb.com/ but I don't know how (or if) that handles consistency issues.