Yarn uses checksum for ensuring data integrity, while npm uses SHA-512 to check data integrity of the packages downloaded. Yarn binds versions of the package strongly. Yarn can install packages from local cache. Zero-Installs solve the needs of installation of packages when packages is required to install when the codes is just fresh fetched to local. Workspaces allow multiple projects to work together in the same repository and automatically apply changes to other relatives when source code is modified, allowing installation of multiple packages in a single pass by running the installation command only once. Release Workflow automatically upgrades relative packages among monorepos workspaces when root packages are upgraded. Users can define which protocol will be used to resolve certain packages, for example, the git protocol is used for downloading a public package from a Git repository, and the patch protocol is used for creating a patched copy of the original package. Plugins can add new resolvers, fetchers, linkers, commands, and can also register to some events or be integrated with each other, most features of Yarn are implemented through plugins, including yarn add and yarn install, which are also preinstalled plugins. This feature is aimed to fix an unwell structured node_modules architecture and resulting in a faster Node.js application start-up time. Plug'n'Play allows users to run Node projects without node_modules folder, defining the way or location to resolve dependencies package files with the Plug-n-Play-control file. Yarn constraints allow users to enforce rules for their dependencies or manifest fields across scoped workspaces.ĭownloaded packages are cached and stored as a single file. 
Users can write their own plugins for Yarn. An alternative to the npm package manager, Yarn was created as a collaboration of Facebook, Exponent (now v), Google, and Tilde (the company behind Ember.js) to solve consistency, security, and performance problems with large codebases.
Yarn is one of the main JavaScript package managers, developed in 2016 by Meta (formerly Facebook) for the Node.js JavaScript runtime environment.
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