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What is PM2 and why is it used?

PM2 is a popular production process manager for Node.js applications. It helps you:

Manage and keep apps alive forever (auto-restart on crashes).
Run apps in cluster mode easily.
Monitor resource usage (CPU, memory).
Handle zero-downtime reloads.

npm install pm2 -g

pm2 start app.js -i max # Runs in cluster mode with max CPU cores

More from Node.js Tutorial

How do you connect Node.js to MongoDB? You typically use the MongoDB Node.js driver or an ODM like Mongoose. Basic connection example with native driver: const { MongoClient } = require('mongodb');
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What are common security issues in Node.js applications?
How do you write unit tests in Node.js? Unit tests check small, isolated pieces of your code (like functions) to make sure they work
How do you prevent SQL Injection?

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