In React.js, you can serialize your whole app state through a simple ˋJSON.stringify` and base64 encode that into the url. The nice property of that is that you get to pass that url around to friends, and when they click on it they'll go to the page, which decodes and deserializes the url and reproduce the exact app state, down to the letters in the input boxes.

Effectively, this gives you "program as a value" where the same url means the same program. Immutable programs basically.

I've tried this and the current downside is that it looks extremely ugly when you try to share a link lol. But this should be circumventable. The other downside is that this is a bit theoretical still. You'll have to exclude sensitive information such as password. Sometimes stuff are in a closure rather than in your ˋstate`.