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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

Contributing

Want to see your code in products used by millions?

Start with our Contributing guide and release your first feature.

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

License

Released under the MIT License.