npm vs yarn vs pnpm: Package Manager Comparison

npm

Features

# Install dependencies
npm install

# Install package
npm install react

# Install dev dependency
npm install --save-dev typescript

# Install globally
npm install -g create-react-app

# Run scripts
npm run build
npm test

# Update packages
npm update

# Outdated packages
npm outdated

# Audit security
npm audit
npm audit fix

Pros

• Built into Node.js
• Largest package registry
• Excellent documentation
• Workspaces support

Cons

• Slow installation
• Duplicate node_modules
• Network overhead

yarn

Features

# Install dependencies
yarn install

# Add package
yarn add react

# Add dev dependency
yarn add --dev typescript

# Run scripts
yarn build
yarn test

# Upgrade interactive
yarn upgrade-interactive --latest

# Workspaces
yarn workspace workspace-name add react

Pros

• Faster than npm (parallel installs)
• PnP (Plug'n'Play) mode
• Better output formatting
• Workspaces built-in

Cons

• Not built into Node.js
• Additional installation
• Smaller community than npm

pnpm

Features

# Install dependencies
pnpm install

# Add package
pnpm add react

# Add dev dependency
pnpm add -D typescript

# Run scripts
pnpm build
pnpm test

# Monorepo
pnpm --filter workspace-name add react

Pros

• Fastest: Uses hard links/symlinks
• Disk efficient: Single copy on disk
• Strict: Prevents phantom dependencies
• Monorepo: Excellent workspaces support

Cons

• Different node_modules structure
• Compatibility issues with some tools
• Newer, smaller ecosystem

Performance Comparison

| Operation | npm | yarn | pnpm | |-----------|-----|------|------| | Install | Slow | Fast | Fastest | | Disk Usage | High | High | Low | | Boot Time | Slow | Fast | Fast | | Monorepos | Workspaces | Workspaces | Built-in |

Lock Files

// package-lock.json (npm)
// yarn.lock (yarn)
// pnpm-lock.yaml (pnpm)

// Commit lock file to version control!
// Ensures reproducible installs

Workspaces (Monorepos)

npm workspaces

// package.json
{
  "workspaces": [
    "packages/*"
  ]
}

pnpm workspace

# pnpm-workspace.yaml
packages:
  - 'packages/*'
  - 'apps/*'

Best Practices

1. 1Lock files: Always commit to version control
2. 2.npmrc: Configure registry, settings
3. 3Engines: Specify Node version
4. 4Scripts: Use npm scripts for tasks
5. 5Audit: Regular security audits

Which to Choose?

Choose npm if:

• Starting new project
• Want simplicity
• Don't need workspaces

Choose yarn if:

• Need faster installs
• Want PnP mode
• Team uses yarn

Choose pnpm if:

• Monorepo setup
• Disk space matters
• Want strict dependencies

Migration

# npm → yarn
yarn import

# npm/yarn → pnpm
pnpm import

# pnpm → npm
pnpm install && pnpm import && npm install

Choose based on your needs!