Scaling in node.js with Cluster

We use cluster module to scale our application across multiple CPU cores by creating multiple Node.js processes that share the same server port.

🚀 When to use cluster module?

• Want to utilize all CPU cores on your machine.
• Your app is I/O-heavy (e.g., APIs, HTTP requests).
• You want automatic restarts of crashed workers.

🔍 How It Works

• The master (primary) process forks child processes (workers).
• All workers share the same port.
• The OS load-balances the incoming connections across them.

🚧 Limitations

• Workers don’t share memory.
• It’s not true multithreading — it's multi-processing.
• Not suitable for CPU-heavy tasks — use worker_threads instead.

🛠 Tech Stack

• Node.js
• Express
• Node.js cluster module

📦 Installation

# Clone the repo
git clone https://github.com/rupachowrasia/nodejs-scaling-cluster.git

# Move into the project directory
cd nodejs-scaling-cluster

# Install dependencies
npm install

# Run the app
npm run start