The simplest option is just to read and write a blob of JSON using the AsyncStorage API: https://facebook.github.io/react-native/docs/asyncstorage.ht...
Another option you could try is Realm, which is commercial but has a free tier (even for commercial apps) and has a pretty simple API: https://news.realm.io/news/introducing-realm-react-native/
Another is the SQLite module which comes with Expo:
Docs: https://docs.expo.io/versions/v16.0.0/sdk/sqlite.html Example: https://github.com/expo/sqlite-example/blob/master/main.js