Building a Real-Time Collaborative Kanban Board with React, TypeScript, and WebSockets

Modern teams expect software to update instantly. Nobody wants to refresh a page every few seconds to see whether a task has moved from "In Progress" to "Done." Applications like Trello, Jira, and Linear have trained users to expect real-time collaboration. In this tutorial, we'll build a simplified real-time Kanban board using React, TypeScript, and WebSockets. Along the way, we'll cover project structure, state management, optimistic UI updates, and handling concurrent changes from multiple users. What We're Building Our application will support: Creating tasks Drag-and-drop task movement Real-time synchronization between users Optimistic updates Type-safe frontend architecture Tech Stack Frontend React TypeScript Vite React DnD Zustand Backend Node.js Express Socket.IO Database PostgreSQL Why WebSockets Instead of Polling? Many developers start with polling: setInterval (() => { fetch ( " /tasks " ); }, 5000 ); This works, but it's inefficient. Problems include: Unnecessary network requests Delayed updates Increased server load Poor user experience WebSockets maintain a persistent connection between client and server. Instead of asking: "Any updates yet?" the server simply says: "Here's an update." The result is lower latency and fewer network requests. Project Structure A scalable React project should avoid putting everything into a single components folder. Here's a structure that works well: src/ ├── api/ ├── components/ ├── features/ │ ├── board/ │ ├── columns/ │ └── tasks/ ├── hooks/ ├── store/ ├── services/ ├── types/ └── utils/ This feature-based organization scales much better than organizing solely by file type. Setting Up React Create the project: npm create vite@latest kanban-board cd kanban-board npm install Install dependencies: npm install zustand socket.io-client react-dnd react-dnd-html5-backend Defining Task Types Type safety becomes increasingly valuable as applications grow. export interface Task { id : string ; title : string ; description : s