Node.js Worker Threads Demo

This project demonstrates the power of Node.js worker threads by comparing operations with only main thread vs multi-thread operations in a credit card debt processing application.

Overview

The application provides two endpoints to process credit card debts updates for 150,000 cards:

• Single-threaded implementation
• Multi-threaded implementation using Node.js worker threads

Performance Comparison

Implementation	Processing Time	Threads
single-threaded	~1h 30min	1
multi-threaded	~50 seconds	7

API Endpoints

Single-threaded

curl http://localhost:3000/single-threaded

This endpoint processes the debt updates sequentially in a single thread.

Multi-threaded

curl http://localhost:3000/multi-threaded

This endpoint distributes the workload across 7 worker threads, significantly improving performance.

Project Structure

src/
├── single-threaded.js      # Single-threaded implementation
├── server.js           # Express server
├── data/              
│   ├── data.json
│   ├── dataWithPendingDebts.json
│   └── new_data.json
└── worker-thread/
    ├── multi-threaded.js   # Multi-threaded implementation
    └── pending_debts.js     # Worker thread logic

Getting Started

1. Clone the repository
2. Install dependencies:

npm install

3. Start the server:

npm start

Technical Details

• The application demonstrates the performance impact of using worker threads for CPU-intensive tasks
• The multi-threaded implementation uses 7 concurrent worker threads to process the data
• Each worker thread handles a portion of the 150,000 credit card records
• The blocking implementation processes records sequentially, resulting in longer execution time

Learning Outcomes

This project serves as a practical example of:

• Node.js Worker Threads implementation
• Performance optimization in Node.js
• Handling CPU-intensive tasks