OpenAPI Generator

OpenAPI Generator is a community-governed, Apache-2.0 open-source project that generates client libraries (SDKs), server stubs, API documentation and configuration automatically from an OpenAPI Specification (v2 and v3). Forked from Swagger Codegen in 2018 by more than 40 of that project's top contributors and template creators, it is one of the most widely deployed implementations of the OpenAPI Specification in existence. The product is a CLI plus Maven, Gradle and sbt plugins, a Docker image and an embeddable JVM library, distributed through npm, PyPI, Maven Central, Homebrew, Scoop and Docker Hub. A hosted Online Generator REST API at api.openapi-generator.tech offers the same generation over HTTP, anonymously and without a key, across 84 client generators and 65 server frameworks.

OpenAPI Generator publishes 2 APIs on the APIs.io network: Clients API and Servers API. Tagged areas include Code Generation, Documentation, Open Source, OpenAPI, and SDK.

OpenAPI Generator’s developer surface includes CLI, changelog, documentation, API reference, getting-started guide, support, engineering blog, and 26 more developer resources.

🌐 Visit website 📡 Source on GitHub

41.9/100 developing ▬ flat Agent 20/100 agent aware Front door AI 1/6 silent open core · Apache-2.0 Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0

AccessFree⚡ Free to try

1 published contract

Code Generation Documentation Open Source OpenAPI SDKAPI ToolingDeveloper Tools SwaggerServer StubsCodegenSDK Generation

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Developer Platform & API Ecosystem Management

BC-4270

Clients

GET /api/gen/clients POST /api/gen/clients/{language}

Kin Score

Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0

Composite quality — 41.9/100 · developing

Contract Quality 6.5 / 16

Developer Ergonomics 8.6 / 13

Access Clarity 3.8 / 13

Operational Transparency 2.0 / 8

Contract Governance 0.4 / 8

Discoverability 4.8 / 7

Regulatory Posture 2.5 / 15

Open Source Surface 6.5 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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

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/.

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 github.com/api-evangelist/openapi-generator: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

OpenAPI Generator is an area vendor: providers adopt it to run part of their developer surface. This is the Kin Score checks its features can move for a provider that adopts it, what each one really earns, and what it earns nothing for.

sdk generationcapability map6 features checked 2026-09-25 · rubric v0.22.0

OpenAPI Generator is free and open source, and its lift is only as good as what the provider publishes and declares. Client SDKs in any number of languages move the SDK pointers. The html and markdown documentation generators can back an API reference pointer. The beta postman-collection generator earns the derived Postman credit. It has no MCP, CLI, llms.txt or Agent Skill output, and it does not touch the contract’s content. Many of its users are API consumers generating clients for their own apps, so none of that reaches the provider’s surface.

Developer Ergonomics10.5 of 42 pts

Check	Earns	Through
Three or more SDKs Developer ErgonomicsPublish and declare three or more language clients.	4.0 of 4	Client SDK generators
At least one SDK Developer ErgonomicsPublish a generated client as a maintained package and declare it as an SDK entry.	3.0 of 3	Client SDK generators
API referencesaturated Developer Ergonomics94% of providers with a contract, docs and a reference already earn this; the vendor cannot move it for most of its buyers.	3.0 of 3	Documentation generators
Postman collectiondiscounted Developer ErgonomicsA collection derived mechanically from the OpenAPI is the derived authorship class. The generator is beta.	0.5 of 2	postman-collection generator (beta)

Across 8977 providers that publish a contract, adopting OpenAPI Generator would move 8846. Median lift: composite +3.6 (90th percentile +5.0), agent readiness +0.0 (+0.0). Conditional rows excluded.

What OpenAPI Generator ships that earns nothing (3)

Schema generators — A GraphQL SDL derived from a REST OpenAPI describes an interface the API does not serve. Publishing it would misdescribe the API; it is not a GraphQL contract.
Schema generators — The openapi and openapi-yaml generators re-serialise the input. They do not change its version or its content.
Server stub generators — Server stubs are generated from a contract that already exists. They add no contract.

A model, not a score. Adopting this vendor changes a provider's Kin Score only when the provider publishes the resulting artifacts on its own surface; nothing here writes a score, and no sponsorship or partnership can. The rating is not for sale → · Full vendor facets artifact

APIs 2

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

OpenAPI Generator Clients API

The clients API from OpenAPI Generator — 3 operation(s) for clients.

OpenAPI Generator Servers API

The servers API from OpenAPI Generator — 3 operation(s) for servers.

Open Collections 3

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

API Collection

OPEN COLLECTION

OpenAPI Generator Online Clients API

OPEN COLLECTION

OpenAPI Generator Online Servers API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Openapi Generator Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Openapi Generator Rate Limits

0 limits

RATE LIMITS

FinOps 1

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

Openapi Generator Finops

FINOPS

Security Posture 2

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

Openapi Generator Authentication

0 schemes

SECURITY

Openapi Generator Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 3

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Conformance

Conformance

Build 6

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

Packages

Packages

CLI

CLI

GitHubOrganization

GitHubOrganization

GitHubRepository

GitHubRepository

Plugins

Plugins

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 6

Status, limits, changes, and where to get help

Releases

ChangeLog

RateLimits

Support

Roadmap

FAQ

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 5

Properties that don't map to a standard resource type

CapabilityMap

VendorFacets

Overlay

Generators

Team

Source (apis.yml)

aid: openapi-generator
name: OpenAPI Generator
description: OpenAPI Generator is a community-governed, Apache-2.0 open-source project that generates client libraries (SDKs),
  server stubs, API documentation and configuration automatically from an OpenAPI Specification (v2 and v3). Forked from Swagger
  Codegen in 2018 by more than 40 of that project's top contributors and template creators, it is one of the most widely deployed
  implementations of the OpenAPI Specification in existence. The product is a CLI plus Maven, Gradle and sbt plugins, a Docker
  image and an embeddable JVM library, distributed through npm, PyPI, Maven Central, Homebrew, Scoop and Docker Hub. A hosted
  Online Generator REST API at api.openapi-generator.tech offers the same generation over HTTP, anonymously and without a
  key, across 84 client generators and 65 server frameworks.
type: Index
deliveryModel:
  model: open-core
  license: Apache-2.0
  license_evidence:
    repo: openapitools/openapi-generator
    spdx: Apache-2.0
    stars: 26762
  open_source: true
  commercial: true
  callable_host: true
  label: Open core · an OSS project plus a commercial hosted product
  confidence: medium
  source:
  - openapi
  - pricing
  - repository-license
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: free
  onboarding: none
  trial: false
  try_now: true
  public: true
  label: Free / Open Source
  confidence: high
  source:
  - plans
  - https://openapi-generator.tech/docs/installation
  - https://api.openapi-generator.tech/api/gen/clients
  generated: '2026-08-06'
  method: searched
  note: Apache-2.0 project with no commercial tier, no sign-up and no API key; the hosted generator answers anonymously. The
    prior derived value (freemium) came from a scaffold plans file carrying invented paid tiers, corrected 2026-08-06.
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/openapi-generator.png
tags:
- Code Generation
- Documentation
- Open Source
- OpenAPI
- SDK
- API Tooling
- Developer Tools
- Swagger
- Server Stubs
- Codegen
- SDK Generation
tags_raw:
- Code Generation
- Documentation
- Open Source
- OpenAPI
- SDK
- API Tooling
- Developer Tools
- Swagger
- Server Stubs
- Codegen
- Open-Source
- SDK Generation
url: https://raw.githubusercontent.com/api-evangelist/openapi-generator/refs/heads/main/apis.yml
created: '2026-03-16'
modified: '2026-08-06'
specificationVersion: '0.23'
apis:
- aid: openapi-generator:openapi-generator-clients-api
  name: OpenAPI Generator Clients API
  description: The clients API from OpenAPI Generator — 3 operation(s) for clients.
  humanURL: https://openapi-generator.tech/docs/online
  baseURL: https://api.openapi-generator.tech
  tags:
  - Clients
  tags_raw:
  - clients
  properties:
  - type: OpenAPI
    url: openapi/openapi-generator-clients-api-openapi.yml
  - type: Authentication
    url: authentication/openapi-generator-authentication.yml
  - type: Conventions
    url: conventions/openapi-generator-conventions.yml
  - type: ErrorCatalog
    url: errors/openapi-generator-problem-types.yml
  - type: DataModel
    url: data-model/openapi-generator-data-model.yml
  - type: APIReference
    url: https://api.openapi-generator.tech/
  - type: Documentation
    url: https://openapi-generator.tech/docs/online
  - type: GettingStarted
    url: https://openapi-generator.tech/docs/usage
  - type: GitHubRepository
    url: https://github.com/OpenAPITools/openapi-generator
- aid: openapi-generator:openapi-generator-servers-api
  name: OpenAPI Generator Servers API
  description: The servers API from OpenAPI Generator — 3 operation(s) for servers.
  humanURL: https://openapi-generator.tech/docs/online
  baseURL: https://api.openapi-generator.tech
  tags:
  - Servers
  tags_raw:
  - servers
  properties:
  - type: OpenAPI
    url: openapi/openapi-generator-servers-api-openapi.yml
  - type: Authentication
    url: authentication/openapi-generator-authentication.yml
  - type: Conventions
    url: conventions/openapi-generator-conventions.yml
  - type: ErrorCatalog
    url: errors/openapi-generator-problem-types.yml
  - type: DataModel
    url: data-model/openapi-generator-data-model.yml
  - type: APIReference
    url: https://api.openapi-generator.tech/
  - type: Documentation
    url: https://openapi-generator.tech/docs/online
  - type: GettingStarted
    url: https://openapi-generator.tech/docs/usage
  - type: GitHubRepository
    url: https://github.com/OpenAPITools/openapi-generator
common:
- type: CapabilityMap
  url: capabilities/openapi-generator-capability-edges.yml
  name: OpenAPI Generator Business Capability Map
- type: VendorFacets
  url: vendor-facets/openapi-generator-vendor-facets.yml
- type: Releases
  url: https://github.com/OpenAPITools/openapi-generator/releases
- type: CodeOfConduct
  url: https://github.com/OpenAPITools/openapi-generator/blob/master/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/OpenAPITools/openapi-generator/blob/master/CONTRIBUTING.md
- type: Overlay
  url: overlays/openapi-generator-online-overlay.yaml
- type: DomainSecurity
  url: security/openapi-generator-domain-security.yml
- type: Packages
  url: packages/openapi-generator-packages.yml
- type: CLI
  url: cli/openapi-generator-cli.yml
- type: ChangeLog
  url: changelog/openapi-generator-changelog.yml
- type: Lifecycle
  url: lifecycle/openapi-generator-lifecycle.yml
- type: Conformance
  url: conformance/openapi-generator-conformance.yml
- type: X-MCPServerCandidate
  url: mcp/openapi-generator-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/openapi-generator-llms.txt
- type: RateLimits
  url: rate-limits/openapi-generator-rate-limits.yml
- type: Plans
  url: plans/openapi-generator-plans-pricing.yml
- type: FinOps
  url: finops/openapi-generator-finops.yml
- type: Website
  url: https://openapi-generator.tech
- type: DeveloperPortal
  url: https://openapi-generator.tech
- type: Documentation
  url: https://openapi-generator.tech/docs/installation
- type: APIReference
  url: https://api.openapi-generator.tech/
- type: GettingStarted
  url: https://openapi-generator.tech/docs/usage
- type: GitHubOrganization
  url: https://github.com/OpenAPITools
- type: GitHubRepository
  url: https://github.com/OpenAPITools/openapi-generator
- type: Support
  url: https://github.com/OpenAPITools/openapi-generator/issues
- type: Roadmap
  url: https://openapi-generator.tech/docs/roadmap
- type: Blog
  url: https://openapi-generator.tech/blog
- type: FAQ
  url: https://openapi-generator.tech/docs/faq
- type: Generators
  url: https://openapi-generator.tech/docs/generators
- type: Plugins
  url: https://openapi-generator.tech/docs/plugins
- type: Team
  url: https://openapi-generator.tech/team
- type: License
  url: https://github.com/OpenAPITools/openapi-generator/blob/master/LICENSE
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-06'
  status: enriched
  artifacts_added: 17
  pass: local-v1

Work with this as data

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

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

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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How their score was established

curl "https://apis.io/api/v1/providers/openapi-generator/evidence"

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OpenAPI Generator

What this lets a business do 1

What adopting OpenAPI Generator moves on the Kin Score 4

APIs 2

Open Collections 3

Pricing Plans 1

Rate Limits 1

FinOps 1

Security Posture 2

Get Started 2

Documentation 3

Agent Surfaces 3

Design & Contract 2

Build 6

Access & Security 1

Operate 6

Commercial 3

Company 2

Other 5

Source (apis.yml)

MCP server

Tools for providers

Call it yourself

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