Chat Application

A full-stack real-time Chat Application built with the MERN Stack (MongoDB, Express.js, React.js, Node.js) and Socket.io.
Supports personal messaging, group chats, file sharing, invite links, and secure JWT authentication.

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✨ Features

• Real-time Messaging
  Instant personal and group chat using WebSockets (Socket.io).

• User Authentication
  Secure login/signup with JWT Authentication.
  Every request is verified with a valid token before allowing access.

• Personal and Group Chat

  • Create personal one-to-one chats.
  • Create and manage group chats.
  • Join groups via shareable invite links.

• Invite Link Management

  • Generate unique group invite links.
  • Links automatically expire after 30 minutes for security.

• File Transfer

  • Share files and media directly in personal and group chats.

• Message Link Detection

  • Automatically detect and display clickable URLs inside messages.

• Improved Performance

  • Fetch all chats in parallel from the database.
  • Combine and send optimized responses to the client.
  • Reduced load time for large message histories.

• Socket.io Optimization

  • Faster reconnection.
  • Minimized event emissions.
  • Reduced unnecessary database calls.

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🛠️ Tech Stack

• Frontend: React.js, Tailwind CSS
• Backend: Node.js, Express.js
• Database: MongoDB (with Mongoose)
• Real-Time Communication: Socket.io
• Authentication: JWT (JSON Web Tokens)

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