WhatUp - A Real-Time Chat Application

WhatUp is a full-stack, real-time chat application built with Next.js and Fastify. It provides a seamless and interactive chatting experience with enterprise-grade features like user authentication, end-to-end encryption, private messaging, and file sharing. This project demonstrates building modern, scalable, and secure real-time web applications with production-ready architecture.

Features

🔐 User Authentication

Multi-Provider Auth:
- Secure user registration with email and password
- JWT-based authentication with refresh token support
- Social login with Google OAuth 2.0
- Stateless session management for enhanced security
- Protected routes with middleware guards

💬 Real-Time Messaging

Socket.IO Integration:
- One-to-one private conversations between users
- Instant message delivery with WebSocket connections
- Message status indicators (sent, delivered, read)
- Typing indicators with real-time updates
- Read receipts with automatic marking
- Message editing and deletion (for everyone or individual)
- User presence indicators (online/offline status)
- Last seen timestamps
- Connection resilience with automatic reconnection

🔒 End-to-End Encryption (E2EE)

Privacy-First Architecture:
- Signal Protocol implementation for message encryption
- Device-specific encryption keys
- Perfect forward secrecy with ephemeral keys
- Encrypted file sharing support
- Key rotation and management
- Zero-knowledge architecture (server cannot decrypt messages)
- Secure key exchange and distribution

📁 File Sharing & Media

Rich Media Support:
- Upload and share images, documents, videos, and voice notes
- Automatic image compression with sharp for optimized storage
- Efficient file storage using Supabase Storage
- File preview and download functionality
- Support for encrypted file transfers
- Media metadata extraction
- Progress indicators for uploads/downloads

🎨 User Experience

Modern UI/UX:
- Responsive design for desktop and mobile
- Dark mode support
- Emoji picker integration
- Message reactions (coming soon)
- Search functionality across conversations
- Notification system
- Customizable chat themes

🔔 Notifications & Alerts

Real-Time Updates:
- Push notifications for new messages
- Desktop notifications support
- Sound alerts for incoming messages
- Badge counters for unread messages
- Background sync for offline messages

Architecture

WhatUp follows a modern, scalable microservices-inspired architecture with clear separation between frontend and backend.

System Overview

┌─────────────────────────────────────────────────────────────┐
│                         Frontend                            │
│                    (Next.js 15 + React)                     │
│                                                             │
│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐    │
│  │   UI Layer   │  │   Context    │  │    Hooks     │    │
│  │  Components  │  │   Providers  │  │   & Utils    │    │
│  └──────────────┘  └──────────────┘  └──────────────┘    │
│         │                 │                  │             │
│         └─────────────────┼──────────────────┘             │
│                           │                                │
│  ┌────────────────────────▼─────────────────────────┐     │
│  │       API Client & Socket.IO Client              │     │
│  │  (HTTP REST + WebSocket Communication)           │     │
│  └────────────────────────┬─────────────────────────┘     │
└─────────────────────────────┼───────────────────────────────┘
                              │
                    HTTPS/WSS │ (Encrypted)
                              │
┌─────────────────────────────▼───────────────────────────────┐
│                         Backend                             │
│              (Fastify + Socket.IO + TypeScript)             │
│                                                             │
│  ┌─────────────────────────────────────────────────────┐  │
│  │              API Gateway Layer                       │  │
│  │  ┌──────────┐  ┌───────────┐  ┌──────────────┐    │  │
│  │  │  REST    │  │ Socket.IO │  │    Auth      │    │  │
│  │  │  Routes  │  │  Handler  │  │  Middleware  │    │  │
│  │  └──────────┘  └───────────┘  └──────────────┘    │  │
│  └─────────────────────────────────────────────────────┘  │
│                                                             │
│  ┌─────────────────────────────────────────────────────┐  │
│  │              Business Logic Layer                    │  │
│  │  ┌──────────┐ ┌────────┐ ┌──────┐ ┌──────────┐    │  │
│  │  │   Auth   │ │Messages│ │ E2EE │ │  Files   │    │  │
│  │  │  Module  │ │ Module │ │Module│ │  Module  │    │  │
│  │  └──────────┘ └────────┘ └──────┘ └──────────┘    │  │
│  └─────────────────────────────────────────────────────┘  │
│                                                             │
│  ┌─────────────────────────────────────────────────────┐  │
│  │               Data Access Layer                      │  │
│  │  ┌──────────┐ ┌────────────┐ ┌────────────────┐   │  │
│  │  │ MongoDB  │ │  Supabase  │ │     Redis      │   │  │
│  │  │ Client   │ │   Client   │ │     Client     │   │  │
│  │  └──────────┘ └────────────┘ └────────────────┘   │  │
│  └─────────────────────────────────────────────────────┘  │
└─────────────────────────────┬───────────────────────────────┘
                              │
         ┌────────────────────┼────────────────────┐
         │                    │                    │
         ▼                    ▼                    ▼
┌─────────────────┐  ┌─────────────────┐  ┌─────────────────┐
│    MongoDB      │  │    Supabase     │  │     Redis       │
│                 │  │  (PostgreSQL)   │  │   (Optional)    │
│  - User Auth    │  │  - Messages     │  │  - Pub/Sub      │
│  - Profiles     │  │  - Conversations│  │  - Rate Limit   │
│                 │  │  - File Storage │  │  - Caching      │
└─────────────────┘  └─────────────────┘  └─────────────────┘

Frontend Architecture

Communication Patterns

HTTP REST API (Primary Data Operations)

Authentication & user management
Message history retrieval
Conversation management
File uploads/downloads
E2EE key exchange

// API Client with retry logic and error handling
const apiClient = {
  baseURL: process.env.NEXT_PUBLIC_API_URL,
  headers: {
    'Authorization': `Bearer ${token}`,
    'Content-Type': 'application/json'
  }
}

WebSocket (Socket.IO) (Real-Time Updates)

Instant message delivery
Typing indicators
User presence updates
Read receipts
Connection status monitoring

// Socket.IO client connection
socket.io-client → ws://backend:3001
Events: {
  'message:new', 'message:updated', 'message:deleted',
  'user:typing', 'user:status', 'conversation:updated'
}

State Management Flow

User Action → Component
     ↓
Context Provider (AuthContext/SocketContext)
     ↓
API Client / Socket.IO Client
     ↓
Backend API
     ↓
State Update → UI Re-render

Key Contexts:

AuthContext: Manages authentication state, user data, and session
SocketContext: Handles WebSocket connection lifecycle and events
ChatContext: Manages active conversations and message state

Backend Architecture

Service-Oriented Design

The backend follows a modular architecture with clear separation of concerns:

src/
├── config/        # Environment and configuration
├── core/          # Core utilities (DB, Redis, Logger)
├── modules/       # Business logic modules
│   ├── auth/      # Authentication & authorization
│   ├── messages/  # Message CRUD operations
│   ├── e2ee/      # End-to-end encryption
│   ├── files/     # File upload/download
│   └── users/     # User management
├── socket/        # Socket.IO handlers & middleware
├── plugins/       # Fastify plugins
└── types/         # TypeScript definitions

Request Flow

REST API Request:

Client → Fastify Route → Validation (Zod) → Auth Middleware
   → Business Logic (Module) → Database → Response

Socket.IO Event:

Client → Socket.IO → Auth Middleware → Rate Limiter
   → Event Handler → Business Logic → Broadcast → Clients

Database Architecture

MongoDB (User Authentication)

Collections: users, sessions
Indexed on: email, googleId
Use case: User profiles, authentication data

Supabase PostgreSQL (Core Data)

Tables: conversations, messages, encryption_keys, files
Real-time subscriptions enabled
Row-level security policies
Use case: Chat data, message history, E2EE keys

Redis (Caching & Pub/Sub)

Socket.IO adapter for horizontal scaling
Rate limiting with sliding window
User presence caching
Session storage

Scaling & Performance

Horizontal Scaling with Redis

WhatUp is designed to scale horizontally using Redis as a pub/sub mechanism for Socket.IO:

┌─────────────┐     ┌─────────────┐     ┌─────────────┐
│  Backend    │     │  Backend    │     │  Backend    │
│  Server 1   │     │  Server 2   │     │  Server 3   │
│  (Socket.IO)│     │  (Socket.IO)│     │  (Socket.IO)│
└──────┬──────┘     └──────┬──────┘     └──────┬──────┘
       │                   │                   │
       └───────────────────┼───────────────────┘
                           │
                    ┌──────▼──────┐
                    │    Redis    │
                    │   Pub/Sub   │
                    │   Adapter   │
                    └─────────────┘

How it works:

User A connects to Server 1, User B connects to Server 2
User A sends a message via Server 1
Server 1 publishes the message event to Redis
Redis broadcasts to all servers (Server 1, 2, 3)
Server 2 receives the event and delivers to User B

Implementation:

// Socket.IO Redis Adapter
import { createAdapter } from '@socket.io/redis-adapter';
import { createClient } from 'redis';

const pubClient = createClient({ url: process.env.REDIS_URL });
const subClient = pubClient.duplicate();

io.adapter(createAdapter(pubClient, subClient));

Rate Limiting Strategy

Redis-based Sliding Window:

Prevents abuse and DDoS attacks
100 messages per minute per user
Configurable per-endpoint limits
Graceful fallback to in-memory when Redis unavailable

Implementation:

// Rate limiting configuration
{
  'message:send': { limit: 100, window: 60000 },  // 100/min
  'typing:start': { limit: 30, window: 60000 },   // 30/min
}

Performance Optimizations

Database Optimization:
- Indexed queries on frequently accessed fields
- Connection pooling (MongoDB: 10 connections, Supabase: 20 connections)
- Prepared statements for SQL queries
- Pagination for message history (50 messages per page)
Caching Strategy:
- User presence cached in Redis (TTL: 5 minutes)
- Conversation metadata cached (TTL: 10 minutes)
- Static assets cached with CDN
- HTTP response caching with appropriate headers
File Handling:
- Automatic image compression (WebP format, 80% quality)
- Lazy loading for images and media
- Chunked file uploads for large files (>10MB)
- CDN delivery for static files
Frontend Optimization:
- Code splitting with Next.js dynamic imports
- React component memoization
- Debounced typing indicators (500ms)
- Virtual scrolling for long message lists
- Service Worker for offline support (planned)

Load Balancing

For production deployments:

# Nginx configuration for load balancing
upstream backend {
    least_conn;  # Use least connections algorithm
    server backend1:3001;
    server backend2:3001;
    server backend3:3001;
}

server {
    location /socket.io/ {
        proxy_pass http://backend;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        # Sticky sessions for WebSocket connections
        ip_hash;
    }
}

Monitoring & Observability

Logging: Structured JSON logs with Pino
Metrics: Connection count, message throughput, error rates
Health Checks: /health endpoint for load balancer
Error Tracking: Centralized error logging

Tech Stack

Frontend Stack

Framework: Next.js (v15) - React framework with App Router for SSR/SSG
Language: TypeScript (v5) - Type-safe development
Styling: Tailwind CSS - Utility-first CSS framework
Real-Time: Socket.IO Client (v4.8) - WebSocket communication
UI Components:
- React (v19) - UI library
- Lucide React - Icon library
- Emoji Picker React - Emoji selection
State Management: React Context API with custom hooks
Testing:
- Jest - Unit testing
- React Testing Library - Component testing
- Playwright - E2E testing
Code Quality: ESLint + Next.js best practices

Backend Stack

Framework: Fastify (v5) - High-performance web framework
Language: TypeScript (v5) - Full type safety
Real-Time: Socket.IO (v4.8) - WebSocket server with Redis adapter
Databases:
- MongoDB + Mongoose (v8) - User authentication & profiles
- Supabase (PostgreSQL) - Messages, conversations, E2EE keys
Caching & Scaling:
- Redis via ioredis (v5) - Pub/Sub, rate limiting, caching
- @socket.io/redis-adapter - Multi-server Socket.IO
Authentication & Security:
- jsonwebtoken - JWT tokens
- jose - Modern JWT/JWE/JWS implementation
- bcryptjs - Password hashing
- Google Auth Library - OAuth 2.0
File Processing:
- sharp (v0.34) - Image optimization
- Supabase Storage - File hosting and CDN
Validation & Serialization:
- Zod (v3) - Schema validation
- fastify-type-provider-zod - Type-safe routes
Utilities:
- nanoid - Unique ID generation
- sanitize-html - HTML sanitization
- Pino - High-performance logging

Infrastructure

Development: Docker (optional), local Node.js
Production Ready:
- Containerized deployment (Docker/Kubernetes)
- Horizontal scaling with Redis
- Load balancing (Nginx/HAProxy)
- CDN for static assets
Monitoring: Structured logging, health checks, error tracking

Getting Started

Prerequisites

Required:

Node.js (v18 or later)
npm or yarn
MongoDB instance (local or Atlas)
Supabase project (free tier available)

Optional (but recommended for production):

Redis server (for scaling and rate limiting)
Google Cloud project with OAuth 2.0 credentials (for Google login)

Installation

Frontend Setup

Clone the repository:

git clone https://github.com/Adiiiicodes/whatup.git
cd whatup/frontend

Install dependencies:
```
npm install
```

Configure environment variables: Create a .env.local file in the frontend directory:

# Backend API URL
NEXT_PUBLIC_API_URL="http://localhost:3001"

# WebSocket URL (usually same as API URL)
NEXT_PUBLIC_SOCKET_URL="http://localhost:3001"

Backend Setup

Navigate to backend directory:
```
cd ../backend
```
Install dependencies:
```
npm install
```

Configure environment variables: Create a .env file in the backend directory:

# Server Configuration
PORT=3001
NODE_ENV=development

# MongoDB (for user authentication)
MONGODB_URI="mongodb://localhost:27017/whatup"

# JWT & Session Secrets (generate strong random strings)
JWT_SECRET="your_jwt_secret_min_32_characters_long"
SESSION_SECRET="your_session_secret_min_32_characters_long"

# Supabase Configuration
SUPABASE_URL="https://your-project.supabase.co"
SUPABASE_KEY="your_supabase_anon_key"
SUPABASE_SERVICE_ROLE_KEY="your_supabase_service_role_key"
SUPABASE_STORAGE_BUCKET="chat-media"

# Redis (optional, but required for production scaling)
REDIS_URL="redis://localhost:6379"
# OR for Upstash Redis
UPSTASH_REDIS_REST_URL="https://your-redis.upstash.io"
UPSTASH_REDIS_REST_TOKEN="your_upstash_token"

# Google OAuth (optional, for social login)
GOOGLE_CLIENT_ID="your_google_client_id"
GOOGLE_CLIENT_SECRET="your_google_client_secret"
GOOGLE_OAUTH_REDIRECT="http://localhost:3001/api/auth/google/callback"

# CORS Origins (comma-separated)
CORS_ORIGINS="http://localhost:3000"

Set up Supabase:
- Create a Supabase project at supabase.com
- Run the SQL migrations in backend/supabase/migrations/ in order:
  - 001_chat_schema.sql - Creates conversations and messages tables
  - 002_message_deletion.sql - Adds message deletion support
  - 003_e2ee_keys.sql - Adds encryption keys table
  - 004_e2ee_messages.sql - Adds E2EE message support
- Create a storage bucket named chat-media and make it public

Start Redis (optional but recommended):

# Using Docker
docker run -d -p 6379:6379 redis:alpine

# Or install locally
# macOS: brew install redis && redis-server
# Ubuntu: sudo apt install redis-server && sudo systemctl start redis

Running the Application

Development Mode

Terminal 1 - Backend:

cd backend
npm run dev
# Server runs on http://localhost:3001

Terminal 2 - Frontend:

cd frontend
npm run dev
# App runs on http://localhost:3000

Production Build

Backend:

cd backend
npm run build
npm start

Frontend:

cd frontend
npm run build
npm start

Testing

Frontend:

# Unit tests
npm test

# E2E tests
npm run test:e2e

# All tests
npm run test:all

Docker Deployment (Optional)

# Build and run with Docker Compose
docker-compose up -d

# View logs
docker-compose logs -f

# Stop containers
docker-compose down

Project Structure

Frontend Structure

frontend/
├── public/               # Static assets (images, icons, etc.)
├── src/
│   ├── app/              # Next.js App Router
│   │   ├── (auth)/       # Authentication pages (login, register)
│   │   ├── chat/         # Main chat interface
│   │   ├── layout.tsx    # Root layout with providers
│   │   └── page.tsx      # Landing page
│   ├── components/       # Reusable React components
│   │   ├── ui/           # Generic UI components (Button, Input, etc.)
│   │   ├── auth/         # Auth forms (LoginForm, RegisterForm)
│   │   ├── chat/         # Chat components (MessageList, ChatInput)
│   │   ├── layout/       # Layout components (Sidebar, Header)
│   │   └── profile/      # User profile components
│   ├── contexts/         # React Context providers
│   │   ├── AuthContext.tsx      # Authentication state
│   │   └── SocketContext.tsx    # WebSocket connection
│   ├── hooks/            # Custom React hooks
│   │   ├── useAuth.ts
│   │   ├── useSocket.ts
│   │   └── useMessages.ts
│   ├── lib/              # Utility functions and API clients
│   │   ├── api.ts        # REST API client
│   │   ├── socketClient.ts  # Socket.IO client
│   │   └── utils.ts      # Helper functions
│   ├── types/            # TypeScript type definitions
│   │   ├── auth.ts
│   │   ├── chat.ts
│   │   └── api.ts
│   └── theme/            # Theme configuration (colors, fonts)
├── .env.local            # Environment variables
└── package.json          # Dependencies and scripts

Backend Structure

backend/
├── src/
│   ├── server.ts         # Application entry point
│   ├── config/           # Configuration files
│   │   └── env.ts        # Environment variable validation
│   ├── core/             # Core infrastructure
│   │   ├── database.ts   # MongoDB connection
│   │   ├── supabase.ts   # Supabase client
│   │   ├── redis.ts      # Redis client & adapter
│   │   ├── logger.ts     # Pino logger
│   │   └── storage.ts    # File storage utilities
│   ├── modules/          # Feature modules
│   │   ├── auth/
│   │   │   ├── auth.routes.ts
│   │   │   ├── auth.service.ts
│   │   │   ├── auth.schema.ts
│   │   │   └── google-auth.service.ts
│   │   ├── messages/
│   │   │   ├── messages.routes.ts
│   │   │   ├── messages.service.ts
│   │   │   └── messages.schema.ts
│   │   ├── e2ee/
│   │   │   ├── e2ee.routes.ts
│   │   │   ├── e2ee.service.ts
│   │   │   └── e2ee.schema.ts
│   │   ├── files/
│   │   │   ├── files.routes.ts
│   │   │   └── files.service.ts
│   │   ├── conversations/
│   │   └── users/
│   ├── socket/           # Socket.IO implementation
│   │   ├── index.ts      # Socket server initialization
│   │   ├── handlers/     # Event handlers
│   │   │   ├── message.handlers.ts
│   │   │   └── conversation.handlers.ts
│   │   ├── middleware/   # Socket middleware
│   │   │   └── auth.middleware.ts
│   │   ├── helpers/      # Socket utilities
│   │   │   ├── socket-events.ts
│   │   │   └── rate-limiter.ts
│   │   └── services/     # Socket business logic
│   ├── plugins/          # Fastify plugins
│   │   └── auth.ts       # JWT authentication plugin
│   ├── types/            # TypeScript types
│   │   ├── api.ts
│   │   ├── auth.ts
│   │   ├── database.ts
│   │   └── socket.types.ts
│   └── utils/            # Utility functions
│       ├── errors.ts     # Error handling
│       ├── responses.ts  # Response formatting
│       └── validators.ts # Input validation
├── supabase/
│   └── migrations/       # Database migrations
│       ├── 001_chat_schema.sql
│       ├── 002_message_deletion.sql
│       ├── 003_e2ee_keys.sql
│       └── 004_e2ee_messages.sql
├── .env                  # Environment variables
└── package.json          # Dependencies and scripts

API Documentation

REST API Endpoints

Authentication:

POST /api/auth/register - Register new user
POST /api/auth/login - Login with credentials
POST /api/auth/logout - Logout current user
GET /api/auth/me - Get current user
POST /api/auth/refresh - Refresh JWT token
GET /api/auth/google - Initiate Google OAuth
GET /api/auth/google/callback - Google OAuth callback

Messages:

GET /api/messages/:conversationId - Get message history
POST /api/messages - Send new message
PATCH /api/messages/:id - Edit message
DELETE /api/messages/:id - Delete message
POST /api/messages/:id/read - Mark message as read

Conversations:

GET /api/conversations - Get all user conversations
GET /api/conversations/:id - Get conversation details
POST /api/conversations - Create new conversation
DELETE /api/conversations/:id - Delete conversation

Files:

POST /api/files/upload - Upload file
GET /api/files/:id - Download file
DELETE /api/files/:id - Delete file

E2EE:

POST /api/e2ee/keys - Upload device encryption keys
GET /api/e2ee/keys/:userId - Get user's device keys
POST /api/e2ee/keys/rotate - Rotate encryption keys

Socket.IO Events

Client → Server:

message:send - Send message
message:edit - Edit message
message:delete - Delete message
message:mark-read - Mark message as read
typing:start - User started typing
typing:stop - User stopped typing
conversation:join - Join conversation room
conversation:leave - Leave conversation room

Server → Client:

message:new - New message received
message:updated - Message was edited
message:deleted - Message was deleted
user:typing - User is typing
user:status - User online/offline status
conversation:updated - Conversation metadata changed
error - Error occurred

Security Considerations

End-to-End Encryption

WhatUp implements Signal Protocol-inspired E2EE:

Double Ratchet Algorithm: Each message uses a new encryption key
X3DH Key Exchange: Secure initial key agreement between devices
Perfect Forward Secrecy: Compromised keys don't affect past messages
Zero-Knowledge: Server cannot decrypt message content

Best Practices Implemented

✅ HTTPS/WSS for all communications
✅ JWT with short expiration times (15 minutes)
✅ Refresh token rotation
✅ Password hashing with bcrypt (12 rounds)
✅ Rate limiting on all endpoints
✅ Input validation and sanitization
✅ SQL injection prevention (parameterized queries)
✅ XSS protection (content sanitization)
✅ CORS configuration for allowed origins
✅ Secure HTTP headers (helmet.js equivalent)

Deployment Security Checklist

Use environment variables for all secrets
Enable Redis authentication in production
Set up SSL/TLS certificates
Configure firewall rules
Enable database authentication
Set up monitoring and alerting
Regular security audits
Keep dependencies updated

Performance Benchmarks

Approximate performance metrics (tested on AWS t3.medium):

Message Latency: <50ms (average)
WebSocket Connections: 10,000+ concurrent
Messages/Second: 5,000+ (with Redis)
Database Queries: <10ms (90th percentile)
File Upload: 2MB/sec (compressed images)
Memory Usage: ~150MB per backend instance

Deployment

Production Deployment Options

1. Cloud Platforms (Recommended)

Vercel (Frontend) + Railway/Render (Backend)
AWS: EC2 + RDS + ElastiCache
Google Cloud: Cloud Run + Cloud SQL + Memorystore
Digital Ocean: Droplets + Managed Databases

2. Container Orchestration

Docker Swarm for simple setups
Kubernetes for enterprise scale

3. Serverless Options

Frontend: Vercel, Netlify, AWS Amplify
Backend: Not recommended (WebSocket limitations)

Environment Variables Summary

Frontend:

NEXT_PUBLIC_API_URL=https://api.yourapp.com
NEXT_PUBLIC_SOCKET_URL=https://api.yourapp.com

Backend:

# Essential
PORT=3001
NODE_ENV=production
MONGODB_URI=mongodb+srv://...
JWT_SECRET=...
SESSION_SECRET=...
SUPABASE_URL=...
SUPABASE_KEY=...
SUPABASE_SERVICE_ROLE_KEY=...

# Scaling (Required for production)
REDIS_URL=redis://...

# Optional
GOOGLE_CLIENT_ID=...
GOOGLE_CLIENT_SECRET=...
CORS_ORIGINS=https://yourapp.com

Roadmap

Troubleshooting

Common Issues

1. Socket.IO connection fails:

# Check if backend is running
curl http://localhost:3001/health

# Verify CORS settings in backend/.env
CORS_ORIGINS=http://localhost:3000

2. Messages not delivering:

Check Redis connection (if enabled)
Verify JWT token is valid
Check browser console for errors

3. File upload fails:

Verify Supabase bucket exists and is public
Check SUPABASE_SERVICE_ROLE_KEY is set
Ensure file size is within limits

4. Redis connection error:

Redis is optional for development
Set REDIS_URL only if Redis is available
Backend will fall back to in-memory if Redis fails

Debug Mode

Enable debug logging:

Backend:

LOG_LEVEL=debug npm run dev

Frontend:

// Add to .env.local
NEXT_PUBLIC_DEBUG=true

Contributing

Contributions are what make the open-source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

How to Contribute

Fork the Project
Create your Feature Branch (git checkout -b feature/AmazingFeature)
Commit your Changes (git commit -m 'Add some AmazingFeature')
Push to the Branch (git push origin feature/AmazingFeature)
Open a Pull Request

Coding Standards

Follow TypeScript best practices
Use ESLint and Prettier configurations
Write tests for new features
Update documentation as needed
Keep commits atomic and well-described

License

Distributed under the MIT License. See LICENSE for more information.

Acknowledgments

Socket.IO for real-time communication
Fastify for high-performance backend
Next.js for amazing developer experience
Supabase for backend-as-a-service
Signal Protocol for E2EE inspiration

Contact

Developer: Aditya Nalawade
Twitter: @scriptSageAdi
Email: nalawadeaditya017@gmail.com
Project Link: https://github.com/Adiiiicodes/whatup

⭐ Star this repo if you find it useful! Follow for more awesome projects.

Name		Name	Last commit message	Last commit date
Latest commit History 23 Commits
public		public
src		src
.gitignore		.gitignore
README.md		README.md
copilot-instructions.md		copilot-instructions.md
eslint.config.mjs		eslint.config.mjs
jest.config.js		jest.config.js
jest.setup.js		jest.setup.js
next-env.d.ts		next-env.d.ts
next.config.ts		next.config.ts
package-lock.json		package-lock.json
package.json		package.json
playwright.config.ts		playwright.config.ts
postcss.config.js		postcss.config.js
tailwind.config.ts		tailwind.config.ts
tsconfig.json		tsconfig.json
tsconfig.tsbuildinfo		tsconfig.tsbuildinfo

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WhatUp - A Real-Time Chat Application

Features

🔐 User Authentication

💬 Real-Time Messaging

🔒 End-to-End Encryption (E2EE)

📁 File Sharing & Media

🎨 User Experience

🔔 Notifications & Alerts

Architecture

System Overview

Frontend Architecture

Communication Patterns

State Management Flow

Backend Architecture

Service-Oriented Design

Request Flow

Database Architecture

Scaling & Performance

Horizontal Scaling with Redis

Rate Limiting Strategy

Performance Optimizations

Load Balancing

Monitoring & Observability

Tech Stack

Frontend Stack

Backend Stack

Infrastructure

Getting Started

Prerequisites

Installation

Frontend Setup

Backend Setup

Running the Application

Development Mode

Production Build

Testing

Docker Deployment (Optional)

Project Structure

Frontend Structure

Backend Structure

API Documentation

REST API Endpoints

Socket.IO Events

Security Considerations

End-to-End Encryption

Best Practices Implemented

Deployment Security Checklist

Performance Benchmarks

Deployment

Production Deployment Options

1. Cloud Platforms (Recommended)

2. Container Orchestration

3. Serverless Options

Environment Variables Summary

Roadmap

Troubleshooting

Common Issues

Debug Mode

Contributing

How to Contribute

Coding Standards

License

Acknowledgments

Contact

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