Load Balancer (Node.js)

This project implements a load balancer using Node.js and Express, featuring rate limiting, response caching, GZIP compression, round-robin server selection, and server health monitoring.

Table of Contents

• Features
• Installation
• Usage
• Configuration
• Project Structure
• Testing
• License

Features

• Load Balancing: Implements round-robin server selection for balancing requests across available servers.
• Rate Limiting: Limits client requests to 100 requests per 15-minute window using express-rate-limit.
• Caching: Caches responses for GET requests to improve efficiency.
• Compression: GZIP compression for all responses using compression middleware.
• Health Monitoring: Periodically pings backend servers to update the list of available servers.

Installation

git clone https://github.com/0xRadioAc7iv/load-balancer-nodejs.git
cd load-balancer-nodejs
npm install

Usage

After setting up the required environment and configuration, you can start the server with the following command:

npm start

This will start an HTTPS server on http://localhost:3000.

Configuration

Edit the config.js file to specify the list of backend servers:

export const SERVERS = [
  "http://server1:port",
  "http://server2:port",
  "http://server3:port"
];

Project Structure

.
├── config.js               # Configuration file for backend server URLs
├── index.js                  # Main application file
├── middlewares/
│   └── logger.js           # Custom logger middleware
├── utils/
│   ├── cache.js            # Functions for caching responses
│   └── requestHandler.js   # Utility to handle server requests
└── README.md             # README file for project documentation

Testing

To test the project, run the following command:

npm test

License

This project is licensed under the MIT License.