npm quick start for beginner

npm Quick Start Guide for Linux

✅ 1. Install Node.js and npm on Linux

npm comes bundled with Node.js. To install both:

Using package manager (RHEL/CentOS/Fedora)

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sudo yum install -y nodejs npm

Using package manager (Debian/Ubuntu)

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sudo apt update
sudo apt install -y nodejs npm

Verify installation

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node -v
npm -v

Tip: For latest versions, use NodeSource repository:

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curl -fsSL https://rpm.nodesource.com/setup_lts.x | sudo bash -
sudo yum install -y nodejs

Or for Debian/Ubuntu:

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curl -fsSL https://deb.nodesource.com/setup_lts.x | sudo -E bash -
sudo apt install -y nodejs

✅ 2. Initialize a Project

Create a new directory and initialize npm:

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mkdir my-app && cd my-app
npm init -y

This creates package.json with default settings.

✅ 3. Install Dependencies

Install a runtime dependency:

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npm install lodash

Install a development dependency:

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npm install --save-dev eslint

✅ 4. Use Installed Packages

Create index.js:

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const _ = require('lodash');
console.log(_.shuffle([1, 2, 3, 4]));

Run the script:

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node index.js

✅ 5. Manage Dependencies

Update all dependencies:

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npm update

Remove a dependency:

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npm uninstall lodash

✅ 6. Run Scripts

Add a script in package.json:

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"scripts": {
  "start": "node index.js"
}

Run it:

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npm start

✅ 7. Publish Your Package (Optional)

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npm login

Publish:

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npm publish

✅ Common Commands Summary

Command	Description
`npm init`	Initialize a project
`npm install <pkg>`	Install a dependency
`npm install -g <pkg>`	Install globally
`npm uninstall <pkg>`	Remove a dependency
`npm update`	Update dependencies
`npm run <script>`	Run a script

✅ Summary

npm is the default package manager for Node.js, enabling easy dependency management, automation via scripts, and access to the largest JavaScript package ecosystem.