OpenAPI TypeScript Codegen

OpenAPI TypeScript Codegen is an MIT-licensed Node.js library and CLI by Ferdi Koomen that reads an OpenAPI 2.0 or 3.0 specification — JSON or YAML, from a path, URL, or string — and generates a lightweight, fully typed TypeScript client. It emits models, services, and core runtime files for one of five HTTP clients (fetch, node-fetch, XHR, Axios, or Angular), and supports cancelable promises, union types instead of enums, runtime schemas, custom request files, and external $ref resolution. It is a build-time developer tool, not a hosted service: there is no API to call, no key to issue, and no pricing. The maintainer has publicly declared the project unmaintained and asks users to migrate to @hey-api/openapi-ts, yet maintenance releases still shipped in December 2025 and June 2026 and the package records roughly 2.46 million npm downloads a month.

OpenAPI TypeScript Codegen is listed with 1 API on the APIs.io network. Tagged areas include Code Generation, OpenAPI, Swagger, SDK, and TypeScript.

OpenAPI TypeScript Codegen’s developer surface includes pricing, documentation, getting-started guide, support, changelog, CLI, and 18 more developer resources.

📡 Profile data on GitHub

27.3/100 thin ▬ flat Agent 1/100 human only Heartbeat 77/100 alive open core · MIT Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFree⚡ Free to try

1 API

Code Generation OpenAPI Swagger SDK TypeScript Developer Tools CLI Open Source

Kin Score

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

Composite quality — 27.3/100 · thin

Contract Quality 0.0 / 19

Developer Ergonomics 5.0 / 15

Access Clarity 4.2 / 15

Operational Transparency 3.0 / 10

Contract Governance 1.6 / 9

Discoverability 4.8 / 8

Regulatory Posture 0.7 / 15

Open Source Surface 6.5 / 10

Agent readiness — 1/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 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 5 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 75 points between them, because both conditional facets apply and carry 25 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
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 →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) 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 →

12 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points Ask about this →
Access Clarity scores 27.7 — up to +14.5 composite points Ask about this →
Developer Ergonomics scores 33.3 — up to +13.3 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/openapi-typescript-codegen/apis.yml: open an issue on github.com/api-evangelist/openapi-typescript-codegen 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 →

Standards implemented 2

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

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Swagger

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 1

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

OpenAPI TypeScript Codegen

The openapi CLI and Node.js library. Consumes an OpenAPI 2.0 or 3.0 specification and writes a typed TypeScript client (models, services, and core runtime) for fetch, node-fetch...

OpenAPI TypeScript Codegen pricing

Prices published by OpenAPI TypeScript Codegen. This record is due for a re-check. A free plan or tier is listed.

Plan	Price
Open Source (MIT) free	Free

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

OpenAPI TypeScript Codegen Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

OpenAPI TypeScript Codegen Rate Limits

0 limits

RATE LIMITS

Deprecation Policy 1

Notice periods, support windows and the headers it sends, quoted from its own page.

OpenAPI TypeScript Codegen

1 quoted statement, read from OpenAPI TypeScript Codegen's own page on 2026-11-10.

DEPRECATION

Data License 1

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

OpenAPI TypeScript Codegen

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

LICENSE

FinOps 1

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

OpenAPI TypeScript Codegen Finops

FINOPS

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

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

GitHubOrganization

GitHubRepository

SourceCode

CLI

Packages

Operate 6

Status, limits, changes, and where to get help

RateLimits

Releases

Support

ChangeLog

Deprecation

DeprecationSchedule

DeprecationSchedule

Commercial 5

Pricing, plans, and the legal terms of use

FinOps

Pricing

License

Plans

DataLicense

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: openapi-typescript-codegen
name: OpenAPI TypeScript Codegen
description: 'OpenAPI TypeScript Codegen is an MIT-licensed Node.js library and CLI by Ferdi Koomen that reads an OpenAPI
  2.0 or 3.0 specification — JSON or YAML, from a path, URL, or string — and generates a lightweight, fully typed TypeScript
  client. It emits models, services, and core runtime files for one of five HTTP clients (fetch, node-fetch, XHR, Axios, or
  Angular), and supports cancelable promises, union types instead of enums, runtime schemas, custom request files, and external
  $ref resolution. It is a build-time developer tool, not a hosted service: there is no API to call, no key to issue, and
  no pricing. The maintainer has publicly declared the project unmaintained and asks users to migrate to @hey-api/openapi-ts,
  yet maintenance releases still shipped in December 2025 and June 2026 and the package records roughly 2.46 million npm downloads
  a month.'
type: Index
deliveryModel:
  model: open-core
  license: MIT
  license_evidence:
    repo: ferdikoomen/openapi-typescript-codegen
    spdx: MIT
    stars: 3369
  open_source: true
  commercial: true
  callable_host: false
  label: Open core · an OSS project plus a commercial hosted product
  confidence: medium
  source:
  - pricing
  - repository-license
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: free
  onboarding: self-service
  trial: false
  try_now: true
  public: true
  label: Free / Open Source (MIT)
  confidence: high
  source:
  - plans
  - https://github.com/ferdikoomen/openapi-typescript-codegen/blob/main/LICENSE
  generated: '2026-08-06'
  method: searched
  note: Corrected from a scaffold-derived "freemium" label. The tool is MIT-licensed and free with no paid tier; GitHub Sponsors
    is optional and gates nothing.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/openapi-typescript-codegen.png
tags:
- Code Generation
- OpenAPI
- Swagger
- SDK
- TypeScript
- Developer Tools
- CLI
- Open Source
tags_raw:
- Code Generation
- OpenAPI
- Swagger
- SDKs
- TypeScript
- Developer Tools
- CLI
- Open Source
- Open-Source
url: https://raw.githubusercontent.com/api-evangelist/openapi-typescript-codegen/refs/heads/main/apis.yml
created: '2026-03-27'
modified: '2026-08-06'
specificationVersion: '0.23'
apis:
- aid: openapi-typescript-codegen:openapi-typescript-codegen
  name: OpenAPI TypeScript Codegen
  description: The openapi CLI and Node.js library. Consumes an OpenAPI 2.0 or 3.0 specification and writes a typed TypeScript
    client (models, services, and core runtime) for fetch, node-fetch, XHR, Axios, or Angular. This is a build-time generator
    that runs locally or in CI — it publishes no HTTP API of its own, so it has no baseURL.
  humanURL: https://github.com/ferdikoomen/openapi-typescript-codegen
  tags:
  - Code Generation
  - SDK
  - TypeScript
  tags_raw:
  - Code Generation
  - SDKs
  - TypeScript
  properties:
  - type: Documentation
    url: https://github.com/ferdikoomen/openapi-typescript-codegen#readme
  - type: GettingStarted
    url: https://github.com/ferdikoomen/openapi-typescript-codegen#usage
  - type: CLI
    url: cli/openapi-typescript-codegen-cli.yml
  - type: Packages
    url: packages/openapi-typescript-codegen-packages.yml
  - type: SourceCode
    url: https://github.com/ferdikoomen/openapi-typescript-codegen
common:
- type: RateLimits
  url: rate-limits/openapi-typescript-codegen-rate-limits.yml
- type: FinOps
  url: finops/openapi-typescript-codegen-finops.yml
- type: Pricing
  url: https://github.com/ferdikoomen/openapi-typescript-codegen/blob/main/LICENSE
- type: Releases
  url: https://github.com/ferdikoomen/openapi-typescript-codegen/releases
- type: CodeOfConduct
  url: https://github.com/ferdikoomen/openapi-typescript-codegen/blob/main/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/ferdikoomen/openapi-typescript-codegen/blob/main/CONTRIBUTING.md
- type: Website
  url: https://github.com/ferdikoomen/openapi-typescript-codegen
- type: Documentation
  url: https://github.com/ferdikoomen/openapi-typescript-codegen/wiki
- type: GettingStarted
  url: https://github.com/ferdikoomen/openapi-typescript-codegen/wiki/Basic-usage
- type: GitHubOrganization
  url: https://github.com/ferdikoomen
- type: GitHubRepository
  url: https://github.com/ferdikoomen/openapi-typescript-codegen
- type: SourceCode
  url: https://github.com/ferdikoomen/openapi-typescript-codegen
- type: Support
  url: https://github.com/ferdikoomen/openapi-typescript-codegen/issues
- type: License
  url: https://github.com/ferdikoomen/openapi-typescript-codegen/blob/main/LICENSE
- type: ChangeLog
  url: changelog/openapi-typescript-codegen-changelog.yml
- type: Deprecation
  url: https://github.com/ferdikoomen/openapi-typescript-codegen#important-announcement
- type: Lifecycle
  url: lifecycle/openapi-typescript-codegen-lifecycle.yml
- type: CLI
  url: cli/openapi-typescript-codegen-cli.yml
- type: Packages
  url: packages/openapi-typescript-codegen-packages.yml
- type: Conformance
  url: conformance/openapi-typescript-codegen-conformance.yml
- type: LLMsTxt
  url: llms/openapi-typescript-codegen-llms.txt
- type: Plans
  url: plans/openapi-typescript-codegen-plans-pricing.yml
- type: DeprecationSchedule
  url: deprecation/openapi-typescript-codegen-deprecation-policy.yml
- type: DataLicense
  url: data-license/openapi-typescript-codegen-data-license.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-06'
  status: enriched
  artifacts_added: 5
  pass: local-v1
x-coverage:
  state: none
  reason: no-developer-program
  detail: OpenAPI TypeScript Codegen is a build-time npm CLI that generates clients from someone else's OpenAPI — it ships
    no API, no baseURL, and no domain of its own, so there is no host to probe for a spec, /.well-known, MCP, or an agent
    card; the artifacts here describe the tool (npm package, CLI flags, changelog, deprecation notice) rather than a service.
  evidence:
  - url: https://raw.githubusercontent.com/ferdikoomen/openapi-typescript-codegen/main/llms.txt
    status: 404
  - url: https://raw.githubusercontent.com/ferdikoomen/openapi-typescript-codegen/main/SECURITY.md
    status: 404
  - url: https://registry.npmjs.org/openapi-typescript-codegen
    status: 200
  - url: https://api.github.com/repos/ferdikoomen/openapi-typescript-codegen
    status: 200
  checked: '2026-08-06'

OpenAPI TypeScript Codegen — frequently asked questions

Does OpenAPI TypeScript Codegen have an API?

Yes. APIs.io lists 1 API from OpenAPI TypeScript Codegen, including OpenAPI TypeScript Codegen.

How much does the OpenAPI TypeScript Codegen cost?

APIs.io lists 1 pricing plan for OpenAPI TypeScript Codegen, with each plan's price, limits and inclusions under Pricing on this page.

Is the OpenAPI TypeScript Codegen ready for AI agents?

OpenAPI TypeScript Codegen has a Kin Score of 27.3 out of 100 (thin) and an Agent Readiness score of 0.6 (human-only), scored by API Evangelist on 2026-11-13.

Work with this as data

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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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Every operation they expose

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