Realtime Collaborative Whiteboard

A realtime collaborative whiteboard with a custom WebSocket engine built from scratch. Instead of relying on Socket.io, this implements the WebSocket protocol directly with a Node.js server for maximum control over the broadcast topology.

The canvas uses an HTML5 Canvas element with a custom rendering loop optimized for low-latency updates — only deltas are transmitted, not full canvas state, keeping bandwidth minimal even at 100+ concurrent users.