Another link (discoverable from the first, but not so obvious): https://github.com/janeasystems/node-mobile-react-demo

Peer-to-peer shared album app, based on Node.js on mobile running a PouchDB server, with a React Native interface.
The app uses Node.js to set up a UDP broadcast communication layer that enables synchronization of the PouchDB database between all the peers on the local network.
PouchDB uses MemDOWN for the levelDB adapter, which stores the database in memory only, with no persistence between runs.