Is it possible to setup a project which has code for both React Native(Mobile app) + React(web), having the code shred between platforms except for the UI part.
You can create 3 stand-alone applications - React, React-native & Server.
Both React & React-native will use the same services from your back-end app.
Else go with a single app where on loading home page, app will understand the device and render React / React-native code as per the device.