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.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles OpenAPI TypeScript Codegen the way a machine reads it — 4 machine-readable artifacts across 1 API, 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 — OpenAPI TypeScript Codegen scores 24.7/100 (emerging), with a separate agent-readiness read of 3/100 (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.
Why this profile is thin
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.
This is an honest zero, not a gap in our research. OpenAPI TypeScript Codegen does not appear to expose an API, so there is nothing here for us to index and nothing for them to fix.
What we probed
https://raw.githubusercontent.com/ferdikoomen/openapi-typescript-codegen/main/llms.txt→ HTTP 404https://raw.githubusercontent.com/ferdikoomen/openapi-typescript-codegen/main/SECURITY.md→ HTTP 404https://registry.npmjs.org/openapi-typescript-codegen→ HTTP 200https://api.github.com/repos/ferdikoomen/openapi-typescript-codegen→ HTTP 200
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. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile OpenAPI TypeScript Codegen
Each block below is one kind of artifact we hold for OpenAPI TypeScript Codegen. 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 1
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.
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...
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 things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate 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.
Openapi Typescript Codegen 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.
Resources
Every other property we hold for OpenAPI TypeScript Codegen — 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 2
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 2
Pagination, idempotency, versioning, errors, and events
Build 6
SDKs, sample code, and the tooling you integrate with
Operate 4
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/openapi-typescript-codegen · machine-readable index on apis.io
This is an independent, third-party profile of OpenAPI TypeScript Codegen, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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