# Yarn

**Canonical:** https://apis.io/providers/yarn-pkg/  
**Website:** https://yarnpkg.com  
**APIs profiled:** 10

Yarn is an open-source JavaScript package manager and project manager originally created at Facebook in 2016 and now developed as a fully independent community project (Yarn Berry, currently v4) on github.com/yarnpkg/berry. Yarn was the first package manager designed around workspaces and introduced Plug'n'Play (a node_modules-free module resolution strategy), Zero-Installs (committable caches for instant clones), Constraints (a cross-workspace policy DSL), and a rich protocol system covering npm, git, github, file, link, portal, patch, exec, and workspace dependencies. It is distributed via Corepack and licensed under BSD-2-Clause.

## Kin Score — 24.7 / 100 (emerging)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 24.7).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 22.7 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 21.1 |
| Developer Ergonomics | 42.9 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (10)

- **Yarn CLI** — The Yarn command-line interface — `yarn` — provides install, add, remove, up, run, exec, dlx, info, why, pack, rebuild, dedupe, node, bin, search, upgrade-interactive, and stage...
- **Yarn Workspaces** — Yarn was the first package manager built specifically around workspaces. `yarn workspace`, `yarn workspaces foreach`, `yarn workspaces focus`, and `yarn workspaces list` provide...
- **Yarn Plug'n'Play** — Plug'n'Play (PnP) is Yarn's alternative to the traditional node_modules folder. Yarn generates a single `.pnp.cjs` file containing the exact dependency tree which Node.js consul...
- **Yarn Zero-Installs** — Zero-Installs commit Yarn's package cache (`.yarn/cache`) into the repository alongside the `.pnp.cjs` file. Clones of the repository can start working immediately without runni...
- **Yarn Constraints** — Yarn Constraints let you declare cross-workspace rules — required fields in `package.json`, forbidden dependencies, version pinning, and consistency requirements — using a JavaS...
- **Yarn Protocols** — Yarn supports a rich set of dependency protocols beyond `npm:` semver — `git:`, `github:`, `file:`, `link:`, `portal:`, `patch:`, `exec:`, `workspace:`, and `http(s):`. Protocol...
- **Yarn Plugin API** — Yarn ships with a full plugin API exposed by `@yarnpkg/core`. Plugins can register commands, resolvers, fetchers, linkers, and lifecycle hooks. Plugins are installed with `yarn ...
- **Yarn Version (Release Workflow)** — Yarn provides a release-workflow primitive for monorepos. Contributors declare per-workspace version bumps as deferred decisions (`yarn version check --interactive`) and the pro...
- **Yarn Patch** — First-class dependency patching — `yarn patch <package>` extracts a temporary editable copy of a dependency and `yarn patch-commit` saves the resulting diff as a `patch:` protoc...
- **Yarn DLX** — The yarn dlx command runs a package in an isolated temporary environment without permanently installing it. Yarn's equivalent of npx, used for one-shot tools, code generators, a...

## Security (1)

- **Yarn Pkg Domain Security** — TLSv1.2

## Tags

Package Manager, JavaScript, Node.js, Monorepo, Workspaces, Plug'n'Play, Open-Source, Berry, Yarn 4

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/yarn-pkg/). Scores are computed from the provider's own public artifacts under a published rubric.