This is a chat application built using the MERN stack (MongoDB, Express, React, Node.js). The backend API connects to MongoDB and the frontend is developed with React.

The project is deployed locally using nodemon for the backend and yarn dev for the frontend folder.

• Node.js: JavaScript runtime environment that executes JavaScript code outside a web browser.
• Express: Fast, unopinionated, minimalist web framework for Node.js, used for building the API.
• MongoDB: NoSQL database for storing user data and messages.
• Mongoose: Elegant MongoDB object modeling for Node.js.
• JWT (jsonwebtoken): For user authentication and securing API routes.
• bcryptjs: Library to hash passwords.
• ws: A simple WebSocket library for real-time communication.
• dotenv: Loads environment variables from a .env.
• cors: Middleware for enabling CORS (Cross-Origin Resource Sharing).
• cookie-parser: Middleware to parse cookies.

• React: JavaScript library for building user interfaces.
• Vite: Next-generation frontend tooling for building modern web applications.
• Axios: Promise-based HTTP client for the browser and Node.js.
• Tailwind CSS: Utility-first CSS framework for rapid UI development.
• Lodash: Utility library providing many useful functions for common programming tasks.

Make sure you have the following installed:

• Node.js
• Yarn
• MongoDB

1. Clone the repository:

   git clone https://github.com/harshita2234/mern-chat.git
   cd mern-chat

2. Install dependencies for the API:

   cd api
   yarn install

3. Install dependencies for the client:

   cd ../client
   yarn install

{
  "bcryptjs": "^2.4.3",
  "cookie-parser": "^1.4.6",
  "cors": "^2.8.5",
  "dotenv": "^16.4.5",
  "express": "^4.19.2",
  "jsonwebtoken": "^9.0.2",
  "mongoose": "^8.4.3",
  "ws": "^8.17.1"
}

{
  "autoprefixer": "^10.4.19",
  "axios": "^1.7.2",
  "lodash": "^4.17.21",
  "postcss": "^8.4.38",
  "react": "^18.3.1",
  "react-dom": "^18.3.1",
  "tailwind": "^4.0.0",
  "tailwindcss": "^3.4.4"
}

Create a .env file in the api directory with the following content:

MONGO_URL="your_mongo_url"
JWT_SECRET="your_jwt_secret"
CLIENT_URL="http://localhost:____"

Replace your_mongo_url and your_jwt_secret with your actual MongoDB connection string and JWT secret key.

1. Start the backend server:

   Navigate to the api directory and run:

   nodemon index.js

2. Start the frontend server:

   Navigate to the client directory and run:

   yarn dev

The application should now be running on http://localhost:____.

This project is licensed under the MIT License.