What is PM2 and how do you use it with Node?

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PM2 (Process Manager 2) is a popular production process manager for Node.js applications. It helps developers run, monitor, and manage Node apps efficiently in production. PM2 ensures that applications run continuously, even if they crash, and provides features like load balancing, logging, and monitoring.

🔑 Key Features of PM2:

• Process Management: Start, stop, restart, and delete Node processes easily.

• Auto-Restart: Restarts the app automatically if it crashes.

• Load Balancing (Cluster Mode): Runs multiple instances to utilize multi-core CPUs.

• Monitoring: Provides CPU and memory usage in real time.

• Log Management: Centralized logs for errors and outputs.

• Startup Scripts: Ensures apps start on server boot.

🚀 Using PM2 with Node.js

1. Install PM2 (globally):

npm install -g pm2

2. Start your Node app:

pm2 start app.js

3. List running processes:

pm2 list

4. Monitor application:

pm2 monit

5. Restart / Stop / Delete app:

pm2 restart app  
pm2 stop app  
pm2 delete app  

6. Cluster mode (multi-core support):

pm2 start app.js -i max

(-i max runs as many instances as CPU cores)

7. Save process list & enable startup:

pm2 save  
pm2 startup  

👉 Summary: PM2 is a powerful tool to run Node.js apps in production, ensuring high availability, scalability, and easy monitoring.

Read More :

What is the build process in React?

How do you configure environment variables for different environments?

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