Node.js Overview

• Node is optimized for I/O-heavy workloads, not compute-heavy operations
• Node provides a non-blocking, event-driven architecture. The non-blocking model enables concurrency without managing threads manually.
• Node is interface to V8. V8 runs the code Node provides the environment
• Node scripts run with unrestricted access to system resources. New permission model exists, it is disabled by default

Packages

• A module is a single file that contains JavaScript code.
• A package is a directory containing modules and a package.json file.
  • file provides metadata about the package, such as its name, version, and dependencies.
• package manager : automates managing packages
• package-lock.json records exact version of each installed package & dependencies .It helps to build identical dependency tree in every dEV environment.

node -c your_script.js #syntax check
node -p "crypto.randomBytes(16).toString('hex')"
node -p "process.argv" hello world #[<path/to/node.js>, 'hello', 'world']
node --watch index.js
node --v8-options | less
node --env-file=.env script.js
node --run start

Core Functionality & System Interaction

• node:buffer: Handles binary data.
• node:child_process: Runs shell commands or forks processes.
• node:cluster: Provides load balancing across workers.
• node:crypto: Offers cryptographic operations.