Building Robust Data Synchronization Code in Node.js

A peer-to-peer to-do app was developed for device synchronization without server storage or cloud services. It uses a broker for client communication, with each device maintaining its database. Updates are exchanged and merged in order to maintain consistency. Extensive end-to-end testing, including a custom test runner, was crucial for ensuring reliability due to the non-deterministic nature of synchronization. The project showcases challenges and solutions in building robust peer-to-peer data synchronization systems.