Hey API

2026 Community Update!

Instant TypeScript SDK from your @fastapi.tiangolo.com app without codegen or OpenAPI. And you get to keep the generics.

SDK inference from OpenAPI files has been achieved internally. Finally, a full no codegen SDK generator.

Hey API is in the Dos Comas Club! For the first time, it’s been downloaded a million times in a single day. Thank you to all the humans and agents using it! 🤖

Paginated @tanstack.com Query, with no pagination code. No configuration required.

You and your agent will love the new CLI. 100% money-back guarantee.

Formisch v1 is here. 🎁 A schema-first form library for 8 frameworks: React, Vue, Svelte, Solid, Angular, Qwik, Preact & React Native. ✅ One Valibot schema = types + validation ✅ Native performance across all 8 frameworks ✅ Headless — works with your existing UI ✅ Bundle size starts at just 2.5 kB

Welcome @skk.moe to the Hall of Fame! He's the mastermind behind the major performance improvements to our generators, including making them up to 40× faster for large specifications. Thanks for making Hey API faster for everyone! 🚀🚀🚀

. @skk.moe has been absolutely on fire with optimizing our generator performance and deserves way more but it's a start

Huge thank you to @neon.com for sponsoring and building on top of Hey API!

Please support our new package openapi-python with a like on @npmx.dev, thank you! npmx.dev/package/@hey...

Hey API now ships plugin type helpers. Finally, a cleaner way to split those large configuration files!

A secret admirer? 🫪

My love letter to @heyapi.dev, Oxide's Drift and a list of useful APIs. All that and more in this issue of the @apisyouwonthate.com newsletter! apisyouwonthate.com/newsletter/g...

Delighted to welcome Unblocked as our newest sponsor. Thank you for sponsoring free and open source software!

*insert caption about not being acquired by @cloudflare.social*

We just donated to @heyapi.dev as part of our open source donation program! It's a TypeScript toolkit that turns your OpenAPI spec into a fully typed API for frontend and backend. We use it so much that one of our engineers, Yuri Mikhin, even built the NestJS plugin for it.

Thank you @evilmartians.com for sponsoring Hey API. People like you make projects like this possible!

Turns out no feature is a small thing. Reverted in the latest release, back to the drawing board.

Authoring plugin configuration has always been verbose and painful, especially for deeply nested or complex options. The next release aims to solve this with a new, declarative approach. If you're writing custom plugins on top of Hey API, we'd love your feedback!

The product strategy in a nutshell.

Anthropic is not acquiring @heyapi.dev, an SDK generator that has powered no @anthropic.com SDK since the earliest days of their API.

Congratulations to Alex Rattray and Stainless on getting acquired by @anthropic.com! Hey API quite literally wouldn’t exist without you and your support over the years.

Every docs page now shows the funding status. As alarming as it is, Hey API is easily one of the more sustainable projects.

It’s about 12,000,000 times every month now. And still so early.

Excited to welcome Photon to our growing fleet of sponsors! Thank you for supporting free and open source software!

It’s the small things. before // after

I have tried many OpenAPI -> SDK solutions, and Hey API has the best DX among them: the best client request options shape, the easiest setup, and it just works out of the box.

🚨 BREAKING: Developers are projected to download packages from Hey API, used by @vercel.com and OpenCode, at least 3 million times per week, per npm.

Hey API featured in @apisyouwonthate.com: “We are currently living in an era where people want us to stop caring about quality. It's really great to see the focus on quality and end-user experience in the OpenAPI space.” Thank you @alexanderkaran.bsky.social!

Hey API for all my future React TanStack Query projects.