Actually, no, it's not. In fact, the Redux FAQ flat-out says "It's up to you to decide what state goes where": http://redux.js.org/docs/FAQ.html#organizing-sta

Actually, no, it's not. In fact, the Redux FAQ flat-out says "It's up to you to decide what state goes where": http://redux.js.org/docs/FAQ.html#organizing-state-only-redux-state http://redux.js.org/docs/FAQ.html#organizing-state-only-redu.... There's certainly some good reasons to put as much of your UI/app state into Redux as possible, but there's also entirely valid reasons why you might not want to put some state in there.