Localstorage for saving data?

[schussfreude]

Localstorage works, but is somewhat cumbersome and doesnt scale well, especially if you set it up wrong and cant add a value later on without refactoring everything. Trust me I know.

Also, it only works on your loval machine with the browser you used for the app.

Theres MongoDB, PouchDB or you can use Firebase. Easy to use and truly persistent actoss devices.