What is the best database to build cross platform app [Web, Electron, Mobile] with react & react-native?

I'm looking to build an app that works cross-platform

Desktop - Electron, NodeJS, React, Redux

Mobile - react-native

Web - NodeJS, React

I need a reliable database for all the platform and my team is also looking to build a server to maintain the DB so I should be able to do that also. The apps will work offline and when they come online they should sync to the server. So please help me in choosing the best. I no option given please write on your reply. I think this will be helpful for lost of developers.

Thanks --RKG