npm vs Yarn vs pnpm — What's the Difference?

npm, Yarn, and pnpm are all Node.js package managers that install and manage JavaScript dependencies, differing mainly in installation speed, disk usage, and lockfile format.

Why they differ

• npm ships by default with Node.js and has closed most of its historical speed gap with the alternatives
• Yarn introduced fast, reliable installs and a lockfile format before npm had one, and offers workspaces for monorepos
• pnpm uses a content-addressable storage system, storing each package version once on disk and linking it into projects, which saves significant disk space across many projects

How to choose

• Use npm if you want the default, zero-extra-install option with the largest ecosystem of examples and documentation
• Use pnpm if disk space or install speed across many projects matters, especially in a monorepo
• Whichever you choose, commit the lockfile (package-lock.json, yarn.lock, or pnpm-lock.yaml) so installs are reproducible across machines

FAQ

Can I mix package managers in one project?

Not safely — each has its own lockfile format and can resolve dependency versions slightly differently, so a team should standardize on one per project.