https://github.com/hey-api/hey-api

👨‍🚀 Turn API specifications into production-ready SDKs, validators, mocks, and more. 20+ plugins. Millions of weekly npm downloads. Used by Vercel, OpenCode, PayPal, AWS, Autodesk, and many more.
https://github.com/hey-api/hey-api

api-client code-generation codegen developer-tools openapi python sdk sdk-generator swagger typescript

Last synced: about 8 hours ago
JSON representation

Host: GitHub
URL: https://github.com/hey-api/hey-api
Owner: hey-api
License: mit
Created: 2024-01-10T15:19:25.000Z (over 2 years ago)
Default Branch: main
Last Pushed: 2026-06-27T00:30:49.000Z (2 days ago)
Last Synced: 2026-06-27T02:13:23.579Z (2 days ago)
Topics: api-client, code-generation, codegen, developer-tools, openapi, python, sdk, sdk-generator, swagger, typescript
Language: TypeScript
Homepage: https://heyapi.dev
Size: 95 MB
Stars: 5,012
Watchers: 10
Forks: 385
Open Issues: 479
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Funding: .github/FUNDING.yml
- License: LICENSE.md
- Code of conduct: CODE_OF_CONDUCT.md

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README

Hey API

"OpenAPI codegen that just works."
_{— Guillermo Rauch, CEO of Vercel}

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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
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npm

openapi-python

Python code generator for SDKs and Pydantic models.

Manual
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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