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SPECIFICTION
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Yarn

yarnpkg.com

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Spec score 8.7 #10 of 93 in Package Managers

What it is

Yarn is a package manager and project manager for JavaScript projects, serving uses from simple projects to industry monorepos. It resolves dependencies, maintains lockfiles and provides workspaces that install and link packages within a project. Modern Yarn uses Plug'n'Play by default, generating a Node.js loader file instead of a typical node_modules folder; users can choose node_modules or pnpm-style symlink installs instead. Yarn caches installed packages and shares them among projects on the same machine. Its offline mirror and zero-installs workflow can keep cached packages in a repository and reduce reliance on the npm registry. Plugins can extend resolvers, fetchers, linkers, commands and lifecycle hooks. Generated editor SDKs and settings support VSCode, Vim, Emacs and Neovim. Yarn runs on Linux, macOS and Windows and is free, with no paid plans or usage limits stated. Its documentation notes that React Native and Expo require typical node_modules installs. Yarn does not run audits during installation by default; users can run yarn npm audit separately.

Spec sheet

Purpose
Yarn is a package manager that also describes itself as a project manager.Read 30 Sep 2026 · yarnpkg.com
Audience
Yarn says it serves simple projects and industry monorepos, including open-source developers and enterprise users.Read 30 Sep 2026 · yarnpkg.com
Free plan
YesRead 22 Sep 2026 · yarnpkg.com
Alternative install modes
Yarn PnP can be replaced with node_modules installs or pnpm-style symlink-based installs.Read 30 Sep 2026 · yarnpkg.com
Caching
Yarn caches installed packages by default and shares them across projects on the same machine.Read 30 Sep 2026 · yarnpkg.com
Compatibility limit
The Yarn PnP documentation identifies React Native and Expo as requiring typical node_modules installs.Read 30 Sep 2026 · yarnpkg.com
Dependency resolution
YesRead 22 Sep 2026 · yarnpkg.com
Editor integrations
Yarn provides generated editor SDKs and settings for tools including VSCode, Vim, Emacs, and Neovim.Read 30 Sep 2026 · yarnpkg.com
Hardened mode
In public GitHub pull requests, Yarn enables hardened mode by default to check lockfile resolutions and metadata against the remote registry; the checks can slow installs.Read 30 Sep 2026 · yarnpkg.com
Install script behavior
Since Yarn 4.14, postinstall scripts do not run by default and must be enabled globally or by package.Read 30 Sep 2026 · yarnpkg.com
Lockfile support
YesRead 22 Sep 2026 · yarnpkg.com
Maintainer model
Yarn describes itself as an independent open-source project tied to no company, with its contributor community defining the roadmap.Read 30 Sep 2026 · yarnpkg.com
Offline and zero installs
Yarn documents an offline mirror and zero-installs workflow that can keep cached packages in the repository and reduce reliance on the npm registry.Read 30 Sep 2026 · yarnpkg.com
Offline installation
YesRead 22 Sep 2026 · yarnpkg.com
Package formats
npm packages; tarballs; local,Git,link,patch,portal,and workspace referencesRead 22 Sep 2026 · yarnpkg.com
Plug'n'Play
Yarn PnP is the default installation strategy in modern Yarn and generates a Node.js loader file instead of a typical node_modules folder.Read 30 Sep 2026 · yarnpkg.com
Plugins
Plugins can add resolvers, fetchers, linkers, CLI commands, and lifecycle hooks.Read 30 Sep 2026 · yarnpkg.com
Private registry auth
YesRead 22 Sep 2026 · yarnpkg.com
Security audits
Yarn does not run audits during yarn install by default; users can run yarn npm audit, which by default covers direct dependencies in the current workspace.Read 30 Sep 2026 · yarnpkg.com
Supported platforms
Linux,macOS,WindowsRead 22 Sep 2026 · yarnpkg.com
Workspace support
YesRead 22 Sep 2026 · yarnpkg.com
Workspaces
Workspaces let Yarn install and link packages in the same project, supporting monorepo workflows.Read 30 Sep 2026 · yarnpkg.com

Plans and prices

Yarn Free Open-source package manager; no paid plans or usage limits stated Read 30 Sep 2026 · yarnpkg.com

Every Yarn plan and price →

Strong points and limits

Strong points

  • Supports workspaces and lockfiles
  • Caches packages across projects
  • Offline mirror and zero-installs workflows are available
  • Plugins can extend commands and lifecycle hooks
  • Free on Linux, macOS and Windows

Limits

  • React Native and Expo require node_modules installs
  • Audits do not run during installation by default
  • Hardened mode checks can slow installs

Who it suits

Yarn suits developers managing JavaScript dependencies, including open-source developers and enterprise users working with monorepos. Teams using React Native or Expo should plan on a node_modules install mode.

Verdict

Yarn offers multiple install strategies, caching, workspaces and offline workflows for JavaScript projects. Its default Plug'n'Play mode is not suitable for React Native and Expo, and installation audits require a separate command.

Where Specifiction places it

Alternatives to YarnAll alternatives →