apigen-tanstack

Generate TanStack Query v5 React hooks from OpenAPI/Swagger specs with built-in test mode.

Quick Example

import { useListPets, useCreatePet } from './api/generated'

function PetList() {
  const { data: pets, isLoading } = useListPets()
  const createPet = useCreatePet()

  if (isLoading) return <div>Loading...</div>

  return (
    <div>
      <ul>
        {pets?.map(pet => (
          <li key={pet.id}>{pet.name}</li>
        ))}
      </ul>
      <button onClick={() => createPet.mutate({ name: 'Buddy' })}>
        Add Pet
      </button>
    </div>
  )
}

Features

• Type-safe hooks — useQuery for GET, useMutation for POST/PUT/PATCH/DELETE
• TypeScript types — interfaces generated from OpenAPI schemas
• Mock data + test mode — static mocks and a React context provider to toggle them on
• Swagger 2.0 support — auto-converted to OpenAPI 3.x
• Flat or split output — single directory or split by API tag with --split
• Config file support — apigen.config.ts with auto-discovery or --config flag
• Interactive wizard — run without flags to be guided through setup
• allOf composition — schema merging for specs using allOf
• Dry-run mode — preview generated files with --dry-run before writing

Install

npm install -D apigen-tanstack

Usage

# From a local file
npx apigen-tanstack generate --input ./openapi.yaml --output ./src/api/generated

# From a config file
npx apigen-tanstack generate --config apigen.config.ts

# Interactive mode (omit flags to be guided through setup)
npx apigen-tanstack generate

# Preview without writing
npx apigen-tanstack generate -i ./openapi.yaml --dry-run

Generated Files

File	Description
types.ts	TypeScript interfaces from schemas
hooks.ts	useQuery / useMutation hooks per endpoint
mocks.ts	Static mock data from schemas
test-mode-provider.tsx	React context for toggling mock mode
index.ts	Barrel re-exports

Test Mode

Wrap your app with the provider to return mock data instead of real API calls:

import { ApiTestModeProvider } from './api/generated'
import { QueryClient, QueryClientProvider } from '@tanstack/react-query'

const queryClient = new QueryClient()

<QueryClientProvider client={queryClient}>
  <ApiTestModeProvider enabled={true}>
    <App />
  </ApiTestModeProvider>
</QueryClientProvider>

Documentation

• Getting Started — Installation, quick start, and first code generation
• Configuration — Config file reference and CLI flags
• Generated Output — File-by-file walkthrough of what apigen produces
• Architecture — Pipeline design, IR spec, and generator internals
• API Reference — Public API for programmatic usage
• Contributing — Development setup, project structure, and how to extend

License

MIT