ShaharAmir
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Node.js5 min read

npm vs pnpm vs Yarn vs Bun: Which Package Manager?

A practical comparison of JavaScript package managers. Speed, disk usage, features, and when to use each one.

S
Shahar Amir

npm vs pnpm vs Yarn vs Bun: Which Package Manager?

Still using npm install and waiting forever? There are faster options. Let's compare them.

Quick Overview

ManagerSpeedDisk UsageMonorepoLearning Curve
npmSlowHighBasicNone
YarnMediumHighGoodLow
pnpmFastLowExcellentLow
BunFastestMediumGoodLow

npm: The Default

npm logo

Comes with Node.js. Everyone knows it. But it's the slowest.

bash
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npm install           # Install dependencies
npm install lodash    # Add a package
npm run build         # Run script
npm ci                # Clean install (CI)

Pros:

  • Zero setup — already installed
  • Largest ecosystem support
  • Most documentation

Cons:

  • Slowest install times
  • Duplicate packages eat disk space
  • node_modules can be massive

pnpm: The Efficient One

pnpm logo

Uses hard links to share packages across projects. Same package? Stored once on disk.

bash
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npm install -g pnpm   # Install pnpm


pnpm install          # Install dependencies
pnpm add lodash       # Add a package
pnpm run build        # Run script
pnpm store prune      # Clean unused packages

Real disk savings:

bash
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# npm: Each project gets its own copy
project-a/node_modules/lodash  # 1.4 MB
project-b/node_modules/lodash  # 1.4 MB
project-c/node_modules/lodash  # 1.4 MB
# Total: 4.2 MB


# pnpm: One copy, hard-linked everywhere
~/.pnpm-store/lodash           # 1.4 MB (shared)
# Total: 1.4 MB

Pros:

  • 2-3x faster than npm
  • Saves massive disk space
  • Strict by default (catches phantom deps)
  • Best monorepo support with workspaces

Cons:

  • Hard links can confuse some tools
  • Slightly stricter than npm (good thing, actually)

Yarn: The Facebook One

Yarn logo

Two versions exist — Classic (v1) and Berry (v2+). Berry uses Plug'n'Play by default.

bash
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corepack enable       # Enable yarn (Node 16+)


yarn                  # Install dependencies
yarn add lodash       # Add a package
yarn build            # Run script (no 'run' needed)

Yarn Berry's Plug'n'Play:

bash
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# No node_modules folder!
# Dependencies stored in .yarn/cache as zip files
# Faster installs, but some packages break

Pros:

  • Parallel downloads (faster than npm)
  • Great workspaces for monorepos
  • Plug'n'Play is innovative

Cons:

  • PnP breaks some packages
  • Two very different versions is confusing
  • Berry's .yarn folder can be messy

Bun: The Speed Demon

Bun logo

Not just a package manager — it's a runtime, bundler, and test runner too.

bash
123456
curl -fsSL https://bun.sh/install | bash


bun install           # Install dependencies
bun add lodash        # Add a package
bun run build         # Run script
bun test              # Run tests (built-in!)

Speed comparison (real project, cold cache):

bash
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npm install    # 42.3s
yarn install   # 31.2s
pnpm install   # 18.7s
bun install    # 6.4s   ← 6x faster than npm

Pros:

  • Stupidly fast — written in Zig
  • All-in-one (runtime + bundler + test runner)
  • Drop-in npm replacement
  • Native TypeScript support

Cons:

  • Still maturing (some edge cases)
  • Not 100% Node.js compatible yet
  • Smaller community than established tools

When to Use Each

Use npm when:

  • You want zero setup
  • Working on a small project
  • Maximum compatibility matters

Use pnpm when:

  • Disk space is limited
  • You have many projects
  • Working in a monorepo
  • You want strictness (catches bugs)

Use Yarn when:

  • Your team already uses it
  • You need proven monorepo support
  • You like workspaces features

Use Bun when:

  • Speed is critical
  • You want an all-in-one tool
  • Starting a new project
  • You're okay with some rough edges

Migration is Easy

Switching is simple — they all use package.json:

bash
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# From npm to pnpm
rm -rf node_modules package-lock.json
pnpm install


# From npm to bun
rm -rf node_modules package-lock.json
bun install


# From yarn to pnpm
rm -rf node_modules yarn.lock
pnpm install

Command Comparison

Actionnpmpnpmyarnbun
Install all`npm install``pnpm install``yarn``bun install`
Add package`npm install lodash``pnpm add lodash``yarn add lodash``bun add lodash`
Add dev dep`npm install -D jest``pnpm add -D jest``yarn add -D jest``bun add -d jest`
Remove`npm uninstall lodash``pnpm remove lodash``yarn remove lodash``bun remove lodash`
Run script`npm run build``pnpm build``yarn build``bun run build`
Update all`npm update``pnpm update``yarn upgrade``bun update`

My Recommendation

For new projects: Start with Bun. It's fast, modern, and handles most cases.

For existing projects: Switch to pnpm. Safe migration, big speed boost, saves disk space.

For monorepos: Use pnpm. Best workspace support, strictest dependency resolution.

For maximum compatibility: Stick with npm. Boring but works everywhere.

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The best package manager is the one your team will actually use. But if you're still waiting 30+ seconds for npm install... maybe try something faster.

#npm#pnpm#yarn#bun#package-manager#tooling

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