Hey API ORG

Hey API
"OpenAPI codegen that just works."— Guillermo Rauch, CEO of Vercel

Manual
 • 
Issues
 • 
Contribute

About

Hey API is an ecosystem for turning API specifications into production-ready code. It's trusted by thousands of companies – from YC startups to Fortune 500 enterprises – and powers products used by millions worldwide.

This is the monorepo containing all open source Hey API packages. For package-specific documentation and quick start guides, see the individual repositories below.

Packages

Package
Description



openapi-ts


TypeScript code generator with 20+ plugins for SDKs, Zod schemas, TanStack Query hooks, and more.

Manual
 • 
npm




openapi-python


Python code generator for SDKs and Pydantic models.

Manual
 • 
npm

Highlights

• production-grade code that compiles
• runs in any Node.js 22+ environment
• accepts any OpenAPI specification
• core plugins for SDKs
• HTTP clients for Fetch API, Axios, Angular, Next.js, Nuxt, HTTPX, and more
• Zod schemas, TanStack Query hooks, Pydantic models, and 20+ plugins to reduce third-party boilerplate
• highly customizable via plugins

Libraries

Package
Description



spec-types


TypeScript definitions for OpenAPI and JSON Schema specifications with complete inline documentation.

npm

<!-- template-contributing-start -->

Contributing

Want to see your code in products used by millions?

Start with our Contributing guide and release your first feature.

<!-- template-contributing-end -->

<!-- template-sponsors-start -->

Sponsors

Partners behind the future of API tooling. Become a sponsor.

Gold

The open source coding agent.


opencode.ai

Silver

scalar.com











fastapi.tiangolo.com











getunblocked.com

Bronze

<!-- template-sponsors-end -->

<!-- template-license-start -->

License

Released under the MIT License.

<!-- template-license-end -->

Collapse