DX oriented - Fully typed

Get started in minutes — no heavy setup.
Stop wasting time juggling libraries and plugins just to get validation and OpenAPI running in your API.
Fully typed solution.

Type-Safe API Client

Generate OpenAPI typings from your backend schemas and consume them with autocomplete and predictable errors.

Bun and Cloudflare Workers versions

CrumbJS runs on Bun for full-server deployments, giving you instant startup, a modern toolchain, and the performance to scale APIs with zero extra setup. For serverless, the @crumbjs/worker package brings nearly the same core features to Cloudflare Workers at the edge.