What is pnpm?
pnpm is an alternative package manager for Node.js that solves the main problem of npm and Yarn: excessive duplication of dependencies in node_modules. Its key feature is hard links and a shared cache, so the same package is not stored a thousand times for different projects.
The idea behind pnpm
- every package has a central cache store on disk
node_modulesholds not copies, but hard links to that cache- this saves disk space and speeds up installation
Advantages of pnpm
| Advantage | What it gives |
|---|---|
| Disk space savings | dozens of gigabytes are not spent on duplicate dependencies |
| Fast install | cache + hard links speed up install |
| Strict node_modules structure | rules out errors that npm/Yarn sometimes mask |
| Monorepo support (pnpm workspaces) | convenient for large projects |
Why it is considered more reliable
pnpm creates a realistic dependency structure, in which each package sees only the modules actually listed in its package.json. This prevents phantom dependencies, a problem that can occur in npm and Yarn.
Summary
pnpm is a fast, space-efficient, and strict package manager that uses a shared cache and hard links to work with dependencies efficiently. It solves the weak points of npm and Yarn, especially noticeable in large projects and monorepos.
Short Answer
Interview readyA concise answer to help you respond confidently on this topic during an interview.