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

The JavaScript ecosystem has four serious package managers in 2025: npm, Yarn, pnpm, and Bun. Each one has vocal advocates, real trade-offs, and legitimate use cases. The wrong choice won't sink your project — but the right one can meaningfully improve your daily workflow. This guide skips the fanboyism and gives you the practical breakdown you need to decide. Why Package Manager Choice Still Matters You might think: "It's just installing packages — how different can they be?" More different than you'd expect: Install speed affects CI pipeline time (and cost) Disk usage matters on dev machines and Docker builds Monorepo support determines whether your multi-package repo stays manageable Lockfile format affects team consistency and security audit tooling Compatibility determines whether your deployment platform (Vercel, Netlify, Railway) plays nicely out of the box npm — The Default That Has Improved a Lot npm ships with Node.js and is the universal baseline. It's the one every develope