npm vs Yarn vs pnpm: Which Package Manager Should You Use in 2025?

A practical comparison of npm, Yarn, and pnpm covering performance, disk usage, workspaces, security, and which one to choose for your project.

The Three Contenders

Every JavaScript project needs a package manager. For years npm was the only choice. Then Yarn came along to fix npm's problems. Then pnpm came to fix Yarn's problems. Now all three are good, and choosing between them is about tradeoffs.

npm — The Default

npm comes bundled with Node.js. You already have it.

Pros:

Zero installation — comes with Node
Massive ecosystem familiarity
npm workspaces for monorepos (added in v7)
package-lock.json ensures reproducible installs

Cons:

Historically slow (much improved in v7+)
node_modules is flat and large
Hoisting can cause phantom dependency access

npm install
npm install lodash
npm install --save-dev typescript
npm run build
npm audit

Yarn — The Original Alternative

Yarn was created by Facebook in 2016 to fix npm's performance and reliability issues. Yarn v1 ("Classic") is battle-tested. Yarn v4 ("Berry") is a complete rewrite with Plug'n'Play.

Pros:

Workspaces support since v1 — great for monorepos
yarn.lock format is more human-readable than npm's
Yarn Berry's PnP eliminates node_modules entirely
Fast parallel installs

Cons:

Yarn Berry's PnP has compatibility issues with some packages
Two very different versions (v1 vs v4) causes confusion
Extra tool to install

yarn install
yarn add lodash
yarn add -D typescript
yarn build

pnpm — The Modern Choice

pnpm (performant npm) addresses the core inefficiency of npm and Yarn: every project copies the same packages to its own node_modules. pnpm uses a global content-addressable store with hard links.

Pros:

Dramatically less disk space — packages are stored once globally, hard-linked into projects
Fastest install times (especially after first install)
Strict by default — prevents accessing undeclared dependencies
Excellent monorepo support with pnpm workspaces
100% npm-compatible package.json

Cons:

Requires separate installation
Strictness can break packages that rely on hoisting

npm install -g pnpm    # install once

pnpm install
pnpm add lodash
pnpm add -D typescript
pnpm run build

Performance Comparison

On a cold install (no cache), all three are similar. The difference shows with the global store:

Scenario	npm	Yarn	pnpm
First install	~30s	~25s	~25s
Second project (same deps)	~30s	~25s	~5s
Disk usage (10 projects)	3GB	2.5GB	500MB

pnpm's advantage multiplies with more projects sharing dependencies.

Monorepo Support

All three support workspaces now, but the developer experience varies:

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

pnpm --filter @myapp/ui build    # run command in specific package
pnpm -r build                    # run in all packages

pnpm's workspace protocol (workspace:*) is the cleanest for linking local packages.

Security

All three now lock dependencies. pnpm's strict isolation means a package can't access code it didn't declare — a security benefit that also catches accidental phantom dependencies early.

My Recommendation

Situation	Use
New project, single dev	pnpm
Monorepo	pnpm
Team already on Yarn	Stay on Yarn v1 or migrate to pnpm
Teaching beginners	npm (no extra setup)
Already using npm, it works	Stay on npm

In 2025: pnpm is the best default choice for new projects. Its disk efficiency is real and measurable, and its strict isolation catches bugs that npm/Yarn silently ignore.

Conclusion

Don't agonize over this decision. All three are production-ready. Pick pnpm for new projects, stick with what works for existing ones, and never mix package managers in the same project (one lockfile, one manager).