Verdaccio

Verdaccio is an open-source, lightweight private npm proxy registry built in Node.js that enables organizations to host, cache, and manage packages privately. It implements the CommonJS Compliant Package Registry specification and provides a REST API for publishing, searching, and managing npm packages in self-hosted or cloud-deployed environments. Verdaccio supports JWT and Basic Auth token authentication, rate limiting, pluggable storage backends, and seamless proxying of upstream registries such as npmjs.org.

Verdaccio publishes 9 API contracts indexed on the APIs.io network, including Dist Tags API, Packages API, Profile API, and 6 more. Tagged areas include npm, Registry, Package Manager, private-registry, and Proxy.

The Verdaccio catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Verdaccio’s developer surface includes authentication, documentation, engineering blog, and 18 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

35.9/100 thin ▬ flat Agent 24/100 agent aware Front door AI 1/6 silent Heartbeat 100/100 alive open core · MIT Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve

1 published contract

npm Registry Package Managerprivate-registryProxy Node.js Open Source Self-Hosted YARNpnpmDocker Kubernetes

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 35.9/100 · thin

Contract Quality 8.4 / 16

Developer Ergonomics 2.5 / 13

Access Clarity 0.8 / 13

Operational Transparency 2.8 / 8

Contract Governance 0.8 / 8

Discoverability 3.7 / 7

Regulatory Posture 2.5 / 15

Open Source Surface 10.0 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 24/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 65 points between them, because both conditional facets apply and carry 35 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 65% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 6.4 — up to +18.7 composite points Ask about this →
Developer Ergonomics scores 19.0 — up to +16.2 composite points Ask about this →
Contract Quality scores 51.8 — up to +12.1 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/verdaccio/apis.yml: open an issue on github.com/api-evangelist/verdaccio to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Cisco DevNet Ecosystem (builders on Meraki, Catalyst, ISE, ThousandEyes, Splunk)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

Verdaccio npm Registry API

The Verdaccio npm Registry REST API implements the CommonJS Compliant Package Registry specification, providing endpoints to publish, retrieve, search, and delete npm packages. ...

Verdaccio Dist Tags API

Manage dist-tags for packages

Verdaccio Packages API

Retrieve package metadata and tarballs

Verdaccio Profile API

User profile management

Verdaccio Publish API

Publish, update, and unpublish packages

Verdaccio Search API

Search the registry

Verdaccio Tokens API

API token management

Verdaccio User API

User authentication and management

Verdaccio Utility API

Utility endpoints

Scroll for all 9

Open Collections 8

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Verdaccio npm Registry dist-tags API

OPEN COLLECTION

Verdaccio npm Registry dist-tags packages API

OPEN COLLECTION

Verdaccio npm Registry dist-tags profile API

OPEN COLLECTION

Verdaccio npm Registry dist-tags publish API

OPEN COLLECTION

Verdaccio npm Registry dist-tags search API

OPEN COLLECTION

Verdaccio npm Registry dist-tags tokens API

OPEN COLLECTION

Verdaccio npm Registry dist-tags user API

OPEN COLLECTION

Verdaccio npm Registry dist-tags utility API

OPEN COLLECTION

Scroll for all 8

Verdaccio API pricing

Not yet checked against Verdaccio's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure.

Plan	Price
Open Source (Self-Hosted)	—
Community Sponsor	—

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Verdaccio Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Verdaccio Rate Limits

1 limits

RATE LIMITS

Data License 1

How its data and outputs may be reused, quoted from its own terms.

Verdaccio

2 quoted statements, read from Verdaccio's own page on 2026-11-10.

LICENSE

FinOps 1

Cost, billing, and metering signals for API financial operations.

Verdaccio Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Verdaccio Context

35 classes · 9 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Verdaccio — jsonschema rules

5 rules · 3 warn-severity 2 info-severity

SPECTRAL

JSON Schema 3

Standalone JSON Schema definitions for this provider's data models.

Verdaccio Package Manifest

8 properties

JSON SCHEMA

Verdaccio Publish Request

6 properties

JSON SCHEMA

Verdaccio Search Results

3 properties

JSON SCHEMA

Examples 4

Example request and response payloads for these APIs.

Verdaccio Login Request Example

6 fields

EXAMPLE

Verdaccio Publish Package Example

6 fields

EXAMPLE

Verdaccio Search Results Example

3 fields

EXAMPLE

Verdaccio Token Create Example

3 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Verdaccio Authentication

http · 2 schemes

SECURITY

Verdaccio Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Verdaccio Agentic Access

24 operations · 11 acting · 1 human-in-the-loop

24 operations · 11 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrg

GitHubOrg

Access & Security 3

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 4

Status, limits, changes, and where to get help

IssueTracker

Releases

Discord

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

License

Plans

FinOps

DataLicense

Company 3

The organization behind the API

Website

Website

Blog

Blog

Bluesky

Bluesky

Other 2

Properties that don't map to a standard resource type

Docker

Docker

Sponsorship

Sponsorship

Source (apis.yml)

aid: verdaccio
name: Verdaccio
description: Verdaccio is an open-source, lightweight private npm proxy registry built in Node.js that enables organizations
  to host, cache, and manage packages privately. It implements the CommonJS Compliant Package Registry specification and provides
  a REST API for publishing, searching, and managing npm packages in self-hosted or cloud-deployed environments. Verdaccio
  supports JWT and Basic Auth token authentication, rate limiting, pluggable storage backends, and seamless proxying of upstream
  registries such as npmjs.org.
type: Index
deliveryModel:
  model: open-core
  license: MIT
  open_source: true
  commercial: true
  callable_host: false
  label: Open core · an OSS project plus a commercial hosted product
  confidence: high
  source:
  - license
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  try_now_blocked_by: loopback
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/verdaccio.png
url: https://raw.githubusercontent.com/api-evangelist/verdaccio/refs/heads/main/apis.yml
created: 2026-06-13
modified: 2026-06-13
specificationVersion: '0.23'
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
x-docs-hosting: github-pages
tags:
- npm
- Registry
- Package Manager
- private-registry
- Proxy
- Node.js
- Open Source
- Self-Hosted
- YARN
- pnpm
- Docker
- Kubernetes
tags_raw:
- npm
- registry
- package-manager
- private-registry
- proxy
- nodejs
- open-source
- self-hosted
- yarn
- pnpm
- docker
- kubernetes
- Open-Source
apis:
- aid: verdaccio:verdaccio-npm-registry-api
  name: Verdaccio npm Registry API
  description: The Verdaccio npm Registry REST API implements the CommonJS Compliant Package Registry specification, providing
    endpoints to publish, retrieve, search, and delete npm packages. It supports JWT tokens and Basic Auth for authentication
    and mirrors the standard npm registry protocol so any npm, yarn, or pnpm client can interact with it without modification.
  humanURL: https://www.verdaccio.org/docs/
  baseURL: http://localhost:4873
  tags:
  - npm
  - Packages
  - Registry
  - Publish
  - Search
  - Proxy
  tags_raw:
  - npm
  - packages
  - registry
  - publish
  - search
  - proxy
  properties:
  - type: Documentation
    url: https://www.verdaccio.org/docs/
  - type: Authentication
    url: https://www.verdaccio.org/docs/authentication/
  - type: Configuration
    url: https://www.verdaccio.org/docs/configuration/
  - type: GitHubRepository
    url: https://github.com/verdaccio/verdaccio
  - type: Docker
    url: https://hub.docker.com/r/verdaccio/verdaccio
  - type: HelmChart
    url: https://charts.verdaccio.org
  contact:
  - FN: Verdaccio Community
    url: https://discord.gg/7qWJxBf
- aid: verdaccio:verdaccio-dist-tags-api
  name: Verdaccio Dist Tags API
  description: Manage dist-tags for packages
  humanURL: https://www.verdaccio.org/docs/
  baseURL: http://localhost:4873
  tags:
  - dist-tags
  properties:
  - type: OpenAPI
    url: openapi/verdaccio-dist-tags-api-openapi.yml
- aid: verdaccio:verdaccio-packages-api
  name: Verdaccio Packages API
  description: Retrieve package metadata and tarballs
  humanURL: https://www.verdaccio.org/docs/
  baseURL: http://localhost:4873
  tags:
  - Packages
  tags_raw:
  - packages
  properties:
  - type: OpenAPI
    url: openapi/verdaccio-packages-api-openapi.yml
- aid: verdaccio:verdaccio-profile-api
  name: Verdaccio Profile API
  description: User profile management
  humanURL: https://www.verdaccio.org/docs/
  baseURL: http://localhost:4873
  tags:
  - Profiles
  tags_raw:
  - profile
  properties:
  - type: OpenAPI
    url: openapi/verdaccio-profile-api-openapi.yml
- aid: verdaccio:verdaccio-publish-api
  name: Verdaccio Publish API
  description: Publish, update, and unpublish packages
  humanURL: https://www.verdaccio.org/docs/
  baseURL: http://localhost:4873
  tags:
  - Publish
  tags_raw:
  - publish
  properties:
  - type: OpenAPI
    url: openapi/verdaccio-publish-api-openapi.yml
- aid: verdaccio:verdaccio-search-api
  name: Verdaccio Search API
  description: Search the registry
  humanURL: https://www.verdaccio.org/docs/
  baseURL: http://localhost:4873
  tags:
  - Search
  tags_raw:
  - search
  properties:
  - type: OpenAPI
    url: openapi/verdaccio-search-api-openapi.yml
- aid: verdaccio:verdaccio-tokens-api
  name: Verdaccio Tokens API
  description: API token management
  humanURL: https://www.verdaccio.org/docs/
  baseURL: http://localhost:4873
  tags:
  - Tokens
  tags_raw:
  - tokens
  properties:
  - type: OpenAPI
    url: openapi/verdaccio-tokens-api-openapi.yml
- aid: verdaccio:verdaccio-user-api
  name: Verdaccio User API
  description: User authentication and management
  humanURL: https://www.verdaccio.org/docs/
  baseURL: http://localhost:4873
  tags:
  - User
  tags_raw:
  - user
  properties:
  - type: OpenAPI
    url: openapi/verdaccio-user-api-openapi.yml
- aid: verdaccio:verdaccio-utility-api
  name: Verdaccio Utility API
  description: Utility endpoints
  humanURL: https://www.verdaccio.org/docs/
  baseURL: http://localhost:4873
  tags:
  - Utility
  tags_raw:
  - utility
  properties:
  - type: OpenAPI
    url: openapi/verdaccio-utility-api-openapi.yml
common:
- type: IssueTracker
  url: https://github.com/verdaccio/verdaccio/issues
- type: Releases
  url: https://github.com/verdaccio/verdaccio/releases
- type: SecurityPolicy
  url: https://github.com/verdaccio/verdaccio/blob/master/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/verdaccio/verdaccio/blob/master/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/verdaccio/verdaccio/blob/master/CONTRIBUTING.md
- type: License
  name: MIT
  url: https://github.com/verdaccio/verdaccio/blob/master/LICENSE
- type: AgenticAccess
  url: agentic-access/verdaccio-agentic-access.yml
- type: DomainSecurity
  url: security/verdaccio-domain-security.yml
- type: Authentication
  url: authentication/verdaccio-authentication.yml
- type: Website
  url: https://www.verdaccio.org/
- type: Documentation
  url: https://www.verdaccio.org/docs/
- type: GitHubOrg
  url: https://github.com/verdaccio
- type: Blog
  url: https://www.verdaccio.org/blog/
- type: Discord
  url: https://discord.gg/7qWJxBf
- type: Bluesky
  url: https://bsky.app/profile/verdaccio.org
- type: Docker
  url: https://hub.docker.com/r/verdaccio/verdaccio
- type: Sponsorship
  url: https://opencollective.com/verdaccio
- type: Plans
  url: plans/verdaccio-plans-pricing.yml
- type: RateLimits
  url: rate-limits/verdaccio-rate-limits.yml
- type: FinOps
  url: finops/verdaccio-finops.yml
- type: DataLicense
  url: data-license/verdaccio-data-license.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Verdaccio API — frequently asked questions

Does Verdaccio have an API?

Yes. APIs.io lists 9 APIs from Verdaccio, including Verdaccio npm Registry API, Verdaccio Dist Tags API and Verdaccio Packages API, and 6 more.

Is there an OpenAPI specification for the Verdaccio API?

Yes. APIs.io indexes 8 OpenAPI specifications for Verdaccio, each linked for download from this page.

How do I authenticate with the Verdaccio API?

Verdaccio uses bearer-token authentication (http · 2 schemes). The details are profiled on APIs.io as Verdaccio Authentication.

How much does the Verdaccio API cost?

APIs.io lists 2 pricing plans for Verdaccio, with each plan's price, limits and inclusions under Pricing on this page.

Is the Verdaccio API ready for AI agents?

Verdaccio has a Kin Score of 35.9 out of 100 (thin) and an Agent Readiness score of 23.7 (agent-aware), scored by API Evangelist on 2026-11-13.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

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Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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