# YARN

**Canonical:** https://apis.io/providers/yarn/  
**APIs profiled:** 2

YARN (Yet Another Resource Negotiator in the original Hadoop context; also the JavaScript package manager) refers here to the yarnpkg.com JavaScript package manager. Yarn is a fast, reliable, and secure dependency management tool for JavaScript. Originally developed by Meta as an alternative to npm, Yarn offers deterministic dependency resolution, offline caching, parallel installation, and Plug'n'Play (PnP) module resolution. The project is actively maintained under the yarnpkg/berry repository (Yarn 2+) with a modular plugin architecture. Yarn provides a programmatic JavaScript/TypeScript API via @yarnpkg/core for building tools and plugins.

## Kin Score — 20.8 / 100 (emerging)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 20.8).

| Facet | Score |
|---|---|
| Discoverability | 59.3 |
| Contract Quality | 0.0 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 35.7 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

## Agent readiness — 2.5 (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 | documented |
| 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

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (2)

- **YARN Core API** — The @yarnpkg/core programmatic JavaScript/TypeScript API that allows applications to interact with Yarn projects, workspaces, and dependency resolution. Used for building Yarn p...
- **YARN CLI** — The Yarn command-line interface built on @yarnpkg/cli, providing commands for package installation, workspace management, publishing, and more. Supports a plugin system for exte...

## Security (1)

- **Yarn Domain Security** — TLSv1.2

## Plans (1)

- **Yarn Plans Pricing**

## Use cases (6)

- **Monorepo Management** — Coordinate dependencies, scripts, and releases across many packages in a single repository.
- **Dependency Management** — Install, upgrade, and audit JavaScript and TypeScript dependencies for libraries and applications.
- **Plugin Development** — Build and distribute plugins that extend the Yarn CLI with project-specific commands and behaviors.
- **Reproducible CI Builds** — Use the lockfile, offline cache, and hardened mode to keep CI installs deterministic and tamper-resistant.
- **Package Publishing** — Publish packages to npm and other registries via the npm-related CLI commands and release workflows.
- **Workspace Coordination** — Run scripts across workspaces, share dependencies, and enforce constraints in large multi-package projects.

## Tags

JavaScript, Node.js, Package Manager, YARN

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