Building Real-Time Collaborative Apps with CRDTs and Y.js

CRDTs (Conflict-free Replicated Data Types) enable real-time collaborative applications by ensuring concurrent edits across multiple peers always converge to the same state without conflicts. Y.js is the most widely adopted JavaScript CRDT library, offering shared types like Y.Text, Y.Array, and Y.Map with efficient hybrid synchronization. The article covers building collaborative text editors and shared whiteboards, along with persistence, user awareness, and performance considerations.