APIfulExtensible, Typed API Tooling

From generated OpenAPI clients to server-side utilities, for any JavaScript runtime

Extensible API Client

Unified createClient interface foundation to build custom API clients.

Get Started

Includes an ofetch adapter, OpenAPI support, and API router extension.

Explore Extensions

Add methods to your API client with full type safety.

Create Extensions

Keep TypeScript definitions up-to-date with the CLI.

CLI Reference

Runtime-free types instead of runtime-generated code.

OpenAPI Integration

Create typed clients for Nitro servers. Designed on top of ofetch.

Typed Clients for Nitro

Ease server-side development with utilities for Hono, Elysia, and more.

Import Utilities

Enjoy full TypeScript support with robust type inference.

Reference