npm vs Yarn: Which Package Manager Is Better?

npm and Yarn are the dominant package managers in the Node.js ecosystem. Here is how they compare in 2026.

Speed

Yarn was initially much faster than npm due to parallel downloads and caching. As of npm 7+, npm has significantly improved speed and now matches Yarn in most scenarios. Yarn still has an edge in cold cache scenarios. Both are fast enough for daily use.

Lock Files

npm uses package-lock.json (introduced in npm 5). Yarn uses yarn.lock. Both ensure deterministic installs across environments. npm's lock file has improved significantly and now includes integrity hashes. Yarn's lock file format is slightly more readable. Both serve the same purpose effectively.

Security

npm introduced npm audit for vulnerability scanning. Yarn has yarn audit (uses the same database). Both support package signing and integrity verification. npm has made significant security improvements including 2FA enforcement for critical packages. Yarn Berry (v2+) offers Plug'n'Play for better dependency isolation.

Feature Comparison

npm: built into Node.js (no separate install), npx for running packages, workspaces for monorepos, npm ci for clean installs. Yarn: Plug'n'Play (zero installs), offline cache, workspaces, constraints for monorepo management, and interactive upgrade tool. Yarn Berry introduces the .yarn directory for better portability.

Compatibility

npm works with every Node.js package and registry. Yarn is compatible with the npm registry but may have issues with some packages that rely on npm-specific behavior. Yarn Classic (v1) had compatibility issues; Yarn Berry (v2+) improved compatibility but introduces new concepts.

Which Should You Use?

Use npm if you want zero setup (comes with Node.js) and broadest compatibility. Use Yarn if you need offline support, Plug'n'Play, or prefer its feature set. Both are excellent choices. The ecosystem is converging, and switching between them is straightforward.