Real-time Chat Application

A modern chat application that enables instant messaging with support for multiple chat rooms, file sharing, and persistent message history.

Core Features

💬 Real-time Messaging

• Instant message delivery using WebSockets
• Typing indicators and read receipts
• Message reactions and replies
• Rich text formatting support

🏠 Chat Rooms

• Public and private chat rooms
• Room creation and management
• User permissions and moderation
• Room search and discovery

📁 File Sharing

• Image and document sharing
• Drag-and-drop file uploads
• File preview and download
• Cloud storage integration

Architecture

The application uses a microservices architecture with Redis for message queuing and MongoDB for persistent storage.

// Socket.io event handling
io.on('connection', (socket) => {
	socket.on('join-room', (roomId) => {
		socket.join(roomId);
		socket.to(roomId).emit('user-joined', socket.userId);
	});

	socket.on('send-message', async (data) => {
		const message = await saveMessage(data);
		io.to(data.roomId).emit('new-message', message);
	});
});

Features horizontal scaling with load balancing and Redis adapter for multi-server deployments.