YARN
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.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles YARN the way a machine reads it — 33 machine-readable artifacts across 2 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — YARN scores 38.1/100 (thin), with a separate agent-readiness read of 7/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile YARN
Each block below is one kind of artifact we hold for YARN. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 2
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
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...
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Yarn Plans Pricing
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Yarn Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Yarn Finops
FINOPSFeatures 11
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Workspaces
First-class monorepo support letting projects split into sub-components managed from a single root.
Plug'n'Play (PnP)
Alternative installation strategy that eliminates node_modules in favor of a single resolution map for faster, stricter installs.
Plugin Architecture
Modular core with 25+ default plugins and a public API for building custom workflows and integrations.
Offline Caching
Local cache of downloaded packages enabling reproducible installs without network access.
Parallel Installation
Concurrent dependency fetching and linking for faster installs versus serial package managers.
Deterministic Resolution
Lockfile-driven dependency resolution that produces identical installs across machines and CI runs.
Hardened Mode
Stricter install mode that verifies registry metadata against the lockfile to defend against supply-chain tampering.
Cross-platform Shell
Built-in shell interpreter so package scripts behave consistently across Linux, macOS, and Windows.
Constraints
Declarative rules for enforcing dependency policies and conventions across a workspace.
Interactive Commands
Search and upgrade UIs that let developers explore and manage dependencies interactively.
Programmatic API
TypeScript-first @yarnpkg/core surface for building plugins, tooling, and CI integrations.
Scroll within the panel for all 11 ·
Spectral Rules 1
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
YARN API Rules
SPECTRALJSON Schema 1
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
YARN Package
JSON SCHEMASecurity Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Use Cases 6
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
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.
Integrations 8
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
npm Registry
Primary package registry for installing and publishing JavaScript packages.
Node.js
Runtime that executes Yarn-managed packages and the Yarn CLI itself.
TypeScript
Yarn ships TypeScript type definitions and is itself written primarily in TypeScript.
Corepack
Node.js shim that pins and provisions the Yarn version per project.
VS Code Editor SDK
Editor SDK integration that wires Yarn PnP-managed dependencies into VS Code's TypeScript and ESLint tooling.
JetBrains Editor SDK
Editor SDK integration for IntelliJ-family IDEs to resolve PnP dependencies in editor tooling.
GitHub
Source repository, issue tracker, and release distribution for the yarnpkg organization.
Discord
Community chat for support, contributor coordination, and announcements.
Scroll within the panel for all 8 ·
Resources
Every other property we hold for YARN — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 1
Portal, sign-up, and the first successful call
Documentation 3
Reference material describing how the API behaves
Build 3
SDKs, sample code, and the tooling you integrate with
Access & Security 1
Authentication, authorization, and security posture
Learn 1
Tutorials, courses, talks, and written guidance
Operate 1
Status, limits, changes, and where to get help
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/yarn · machine-readable index on apis.io