Storing UserPreferences with a React Native App

You may try AsyncStorage instead?

I created a bridge module that interfaces with NSUserDefaults. If you still wanted or needed it (ie. you have an existing app that uses NSUserDefaults already), check it out: https://github.com/dsibiski/react-native-userdefaults-ios

I've created a component to use of NSUserDefaults, it have set and get method, much easy to use, suits for storing those small, insensitive and permanent info or user preferences.