Real-Time Chat Application with Websockets, React and Golang

Full-Stack WebSocket Messaging Platform with Advanced Authentication & Real-Time Communication

🛠️ Technical Stack

Backend: Go with Gorilla Mux & WebSocket libraries

Frontend: React 18 with TypeScript & Vite

Database: PostgreSQL with connection pooling

Authentication: JWT tokens with secure cookie sessions

UI/UX: Material-UI with responsive design

State Management: React Query + Zustand

🔥 Key Features Implemented

Real-Time Messaging: WebSocket connections for instant message delivery

User Authentication: Secure registration/login with JWT & bcrypt password hashing

User Search: Dynamic username search with real-time filtering

Message History: Persistent chat history with offline message queuing

Responsive Design: Mobile-first approach with adaptive layouts

Connection Management: Handles user online/offline states gracefully

🏗️ Architecture Highlights

Dual-Server Setup: Separate HTTP (8080) & WebSocket (8081) servers

Connection Pooling: Efficient WebSocket client management

Message Routing: Smart message delivery with offline user handling

CORS Configuration: Secure cross-origin request handling Input

Validation: Comprehensive server-side validation & sanitization

Error Handling: Robust error management across frontend & backend

🎯 Technical Challenges Solved

Real-Time Synchronization: Managing concurrent WebSocket connections

Offline Message Handling: Storing & delivering messages when users return

Security Implementation: JWT validation, SQL injection prevention, secure sessions

State Management: Efficient data flow between React components & WebSocket

Database Optimization: Prepared statements & connection pooling

📱 User Experience Features

Intuitive Search Interface: Clean, responsive user discovery

Smooth Animations: Hover effects & transitions for better UX

Loading States: Proper feedback during API calls

Error Boundaries: Graceful error handling & user notifications

Responsive Grid: Adaptive card layouts for different screen sizes

🔒 Security & Performance

Secure Authentication: JWT with configurable expiry times

Password Security: bcrypt hashing with salt rounds

SQL Injection Prevention: Parameterized queries throughout

Input Sanitization: Server-side validation for all user inputs

CORS Security: Proper origin validation & header management

Connection Optimization: Efficient WebSocket pooling & cleanup

🚀 Production Ready Environment

Configuration: Flexible config system with .env support

Database Migrations: Structured schema management

Error Logging: Comprehensive logging for debugging & monitoring

Scalable Architecture: Designed for horizontal scaling

Clean Code: Well-structured, documented, and maintainable codebase

Result: A production-ready real-time chat application that demonstrates full-stack development expertise, modern web technologies, and professional software engineering practices. The system successfully handles concurrent users, maintains message persistence, and provides a seamless real-time communication experience.