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Real-time Chat Application

A scalable real-time chat application built with WebSockets, Redis, and React

React
Node.js
WebSocket
Redis
MongoDB

Real-time Chat Application

A production-ready chat application supporting thousands of concurrent users.

Features

  • Real-time Messaging: Instant message delivery using WebSockets
  • Group Chats: Create and manage group conversations
  • File Sharing: Share images and documents
  • Typing Indicators: See when others are typing
  • Read Receipts: Know when messages are read
  • Offline Support: Queue messages when offline

Architecture

Built with a microservices architecture for scalability.

Backend

server.js

Frontend

Chat.jsx

Challenges

Scaling WebSocket Connections

Used Redis pub/sub to sync messages across multiple server instances.

Message Persistence

Implemented MongoDB for message storage with efficient indexing.

Results

  • 10,000+ concurrent users
  • Sub-100ms message latency
  • 99.99% uptime
  • Featured on Product Hunt