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OpenAPI to
in seconds.

Production-grade API infrastructure. Typed SDKs, Zod schemas, TanStack Query hooks, and 20+ plugins. Free and open source.

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from pydantic import BaseModel, AwareDatetime
from typing import Literal
from uuid import UUID

class Order(BaseModel):
    id: UUID
    symbol: str
    side: Literal['buy', 'sell']
    type: Literal['market', 'limit', 'stop', 'stop_limit']
    quantity: float
    price: float | None = None
    status: Literal['pending', 'open', 'filled', 'partially_filled', 'cancelled', 'rejected']
    createdAt: AwareDatetime

from client import Client, CreateOrderData

client = Client()

order, error = client.create_order(CreateOrderData(
    symbol='AAPL',
    side='buy',
    type='limit',
    quantity=10,
    price=189.50,
))

if error:
    print(f'Order failed: {error.message}')
else:
    print(f'Order placed: {order.id}')

Up and running in minutes

One config file. One command. Every time your spec changes.

01 / 04 Define your API

Define your API

Start with an existing spec or create one from scratch. OpenAPI is the foundation that powers everything.

openapi: 3.2.0
info:
  title: Equity Trading API
  version: 1.2.0
paths:
  /orders:
    post:
      operationId: createOrder
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Order'
      responses:
        '201':
          description: Order placed
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Order'

Connect your spec

Pass a local path, remote URL, or an API registry shorthand. All valid OpenAPI versions and file formats supported, including inline spec objects.

export default defineConfig({
  input: 'https://api.tradespark.io/openapi.json',
  output: 'src/trading-client',
});

Compose your output

Choose exactly what gets generated – nothing more, nothing less. Each plugin is independent and composable.

export default defineConfig({
  input: 'https://api.tradespark.io/openapi.json',
  output: 'src/trading-client',
  plugins: ['@hey-api/sdk', 'zod', '@tanstack/react-query'],
});

Use it

Run once or integrate into CI. Generated code is fully typed and deterministic. Same spec, same output, every time.

import { createOrder, zOrder } from './trading-client';

const { data, error } = await createOrder({
  body: {
    symbol: 'AAPL',
    side: 'buy',
    type: 'limit',
    quantity: 10,
    price: 189.5,
  },
});

if (error) {
  console.error('Order rejected:', error.message);
  return;
}

const order = zOrder.parse(data);
console.log(`Order ${order.id} is ${order.status}`);

Everything your API layer needs

Pick what you need. Everything works together.

SDKs & Types

Typed SDK clients that regenerate as your API evolves. No handwritten interfaces to maintain.

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Plugin Ecosystem

From TanStack Query to Zod. Every plugin is opt-in, independently useful, and built to work together.

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HTTP Clients

Native support for your runtime. Fetch API, Axios, Angular, Next.js, Nuxt, and more.

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Extensibility

Build custom plugins and clients with the same APIs powering the built-ins. A platform, not a black box.

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Honest take

Not the right fit if…

Your spec is broken or out of date.
You're building a one-off integration, not a long-term API contract.
You already have a codegen workflow that works.
You want zero build steps.
We don't support your language yet.

If none of these apply, you'll probably love it.

The API tooling I always wanted.

I built API clients for years using every tool out there. They all felt like an afterthought – I was always sacrificing quality, workflow, cost, or speed.
Eventually, I decided to reject those trade-offs. But I didn't want to build yet another code generator. I wanted to create the last code generator. After years of work, I'm excited to finally share it with you.
Hey API is purpose-built from scratch to handle all kinds of APIs, yours included. It's fast, open source, and deeply customizable. The output is production-grade. Most importantly, it just works.
I can't wait to see what you build with it.

Coming soon

Python is next.

The ecosystem trusted by TypeScript developers is coming to Python codebases. Production-grade SDKs, Pydantic models, and more. Sign up for early access.

Ready when you are.

Player 1 OpenAPI Spec READY

Player 2 Your Client READY?

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Up and running in minutes

Define your API

Everything your API layer needs

SDKs & Types

Plugin Ecosystem

HTTP Clients

Extensibility

Not the right fit if…

Python is next.

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