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Real-Time Chat Application

A real-time messaging application with WebSocket support, user authentication, and message encryption.

August 20, 2023
ReactNode.jsSocket.ioMongoDBRedis
Live Demo View Source

Overview

A full-featured real-time chat application that supports private messaging, group chats, and file sharing. Built with a focus on performance and security.

Key Features

  • Real-Time Messaging: Instant message delivery using WebSockets
  • Group Chats: Create and manage group conversations
  • File Sharing: Share images and documents within chats
  • Message Encryption: End-to-end encryption for private messages
  • Online Status: See when other users are online

Technical Stack

The frontend is built with React and uses Socket.io for real-time WebSocket connections. The backend runs on Node.js with Express, using MongoDB for persistent storage and Redis for session management and caching.

Performance Optimizations

  • Message pagination with infinite scroll
  • Image compression before upload
  • Redis caching for frequently accessed data
  • Connection pooling for database queries

Challenges

The biggest challenge was implementing reliable message delivery with offline support. I solved this by implementing a message queue system that stores undelivered messages and sends them when the recipient comes back online.