💬 Real-Time Chat Application (MERN Stack)

A full-stack real-time chat application built using the MERN stack with modern technologies like Socket.io, JWT Authentication, Zustand, and fully Dockerized using Docker & Docker Compose 🐳.

🔗 Live Demo: https://chat-app-uiqr.onrender.com

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🚀 Features

🔐 Authentication & Authorization

• Secure login/signup using JWT

💬 Real-Time Messaging

• Instant messaging powered by Socket.io

🟢 Online User Status

• See who is online in real-time

🧠 Global State Management

• Managed efficiently using Zustand

⚙️ Error Handling

• Robust error handling on both client & server

🎨 Modern UI

• Built with TailwindCSS + DaisyUI

🐳 Dockerized Architecture

• Dockerized frontend & backend services
• Multi-container setup using Docker Compose

🔄 Continuous Integration

• GitHub Actions workflow for automated CI
• Runs on every push and pull request to the main branch
• Automatically installs dependencies and validates the Docker build

🚀 Deployment

• Fully deployed on Render

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🛠️ Tech Stack

Frontend

• React.js
• Zustand
• TailwindCSS
• DaisyUI

Backend

• Node.js
• Express.js
• MongoDB
• Socket.io
• JWT Authentication

DevOps / Deployment

• Docker
• Docker Compose
• GitHub Actions
• Continuous Integration (CI)
• Render

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📸 Screenshots

💬 Chat Interface

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🟢 Profile Page

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🔐 Login / Signup Page

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📂 Project Structure

frontend/    → React Frontend
backend/     → Node.js + Express Backend
docker-compose.yml

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⚡ Getting Started

1️⃣ Clone the Repository

git clone https://github.com/debojeetmitra/CHAT_APP.git
cd CHAT_APP

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🖥️ Run Locally

Backend Setup

cd backend
npm install
npm run dev

Frontend Setup

cd frontend
npm install
npm run dev

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🐳 Run with Docker

Build & Start Containers

docker compose up --build

Stop Containers

docker compose down

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🔑 Environment Variables

Create a .env file inside the backend folder:

PORT=5000
MONGODB_URI=your_mongodb_connection_string
JWT_SECRET=your_secret_key

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🎯 Key Learnings

• Implemented real-time communication using WebSockets
• Understood JWT-based authentication flow
• Managed global state with Zustand
• Learned Docker & Docker Compose
• Worked with multi-container applications
• Improved debugging and deployment workflow
• Understood full-stack deployment on Render
• Built a CI pipeline using GitHub Actions
• Automated dependency installation and Docker image validation

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🤝 Contributing

Contributions are welcome! Feel free to fork this repo and improve it.

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📬 Contact

If you have any questions or suggestions, feel free to reach out.

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⭐ If you like this project, give it a star!