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What are the differences between npm, Yarn, and pnpm?

Q: What are the differences between npm, Yarn, and pnpm?

**TL;DR.** All three install packages from the npm registry but differ in **node_modules layout** and speed. npm and Yarn **flatten** dependencies into node_modules ; **pnpm** uses a global **content-addressable store** with symlinks — saving disk, speeding installs, and enforcing **strict** access (you can only import what you declared). Each has its own lockfile and workspaces. npm / Yarn flattened node_modules duplicated on disk can import undeclared deps <rect class='d-box-accent' x='240' y='30' width='200' height='110' rx=

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Install strategy, lockfiles, and disk usage across the three managers.

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Equivalent commands

npm install            yarn            pnpm install
npm install zod        yarn add zod    pnpm add zod
npm run build          yarn build      pnpm build

# pnpm dedups across all your repos via a single global store

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