Gaurav Sachdeva

If you work with JavaScript, Node.js, React, Vue, or Next.js, you must use a package manager.
The three most popular ones today are npm, Yarn, and pnpm.

This article explains:

• How each package manager works
• Key technical differences
• Command examples
• Which one is best for your project

What is a Package Manager?

A package manager:

• Installs dependencies
• Manages versions
• Locks dependencies for consistent builds
• Handles scripts and updates

In short: it keeps your project stable and repeatable.

1. npm (Node Package Manager)

npm is the default package manager for Node.js.

Install npm

npm comes automatically when you install Node.js:

node -v
npm -v

Common npm Commands

npm init
npm install react
npm install lodash --save
npm install eslint --save-dev
npm uninstall lodash
npm update
npm run dev

How npm Works (Technically)

• Stores dependencies in node_modules
• Uses package-lock.json for dependency locking
• Flat dependency tree (can cause duplication)

Pros

• Default with Node.js
• Massive ecosystem
• Improved performance since npm v7+

Cons

• Larger node_modules
• Slower in very large projects

Best for: Beginners, solo developers, standard projects

2. Yarn

Yarn was introduced by Facebook to improve npm’s speed and reliability.

Install Yarn

npm install -g yarn

Common Yarn Commands

yarn init
yarn add react
yarn add eslint --dev
yarn remove lodash
yarn upgrade
yarn dev

How Yarn Works

• Uses yarn.lock for exact dependency versions
• Parallel package installation
• Better caching than early npm versions

Pros

• Faster installs than old npm
• Stable dependency resolution
• Popular in enterprise teams

Cons

• Extra tool to maintain
• Less advantage now because npm improved

Best for: Team projects, CI/CD environments

3. pnpm (Performant npm)

pnpm is the fastest and most disk-efficient package manager.

Install pnpm

npm install -g pnpm

Common pnpm Commands

pnpm init
pnpm add react
pnpm add eslint -D
pnpm remove lodash
pnpm update
pnpm run dev

How pnpm Works (Important)

• Uses a global content-addressable store
• Hard-links dependencies instead of copying
• Strict dependency isolation (prevents hidden bugs)

Result:

• Smaller node_modules
• Faster installs
• Fewer dependency conflicts

Pros

• Extremely fast
• Saves disk space
• Best for monorepos

Cons

• Some older packages assume flat node_modules
• Slight learning curve

Best for: Large apps, monorepos, performance-focused teams

npm vs Yarn vs pnpm: Technical Comparison

Which Package Manager Should You Choose?

Use npm if:

• You are new to Node.js
• You want zero setup
• You work on small or medium projects

Use Yarn if:

• You work in a team
• You need stable builds
• Your company already uses Yarn

Use pnpm if:

• You handle large codebases
• You use monorepos
• You want best performance and disk usage

My Opinion:

pnpm is technically the best, but npm or yarn is still perfectly fine for most developers.