hey-api

Overview of hey-api

What it is

Hey API is an ecosystem for turning API specifications into production-ready code. It is a monorepo containing open source packages, including openapi-ts (TypeScript code generator with 20+ plugins) and openapi-python (Python code generator). The project is used by companies such as Vercel, OpenCode, PayPal, AWS, and Autodesk, and receives millions of weekly npm downloads.

Key features

• 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

Use cases

• Generating TypeScript SDKs from OpenAPI specifications - Generating Python SDKs and Pydantic models - Creating Zod schemas and TanStack Query hooks for validation and data fetching - Building mocks and validators from API specs - Reducing boilerplate in projects that consume APIs

Getting started

See the repository README for package-specific documentation and quick start guides.

License and pricing

MIT License. Open source.

Based on the project's public README and repository metadata.