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CrumbJS

Build, Validate & Document APIs. Fast.

Easy to Use

Easy to Use

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

Type-Safe API Client

Type-Safe API Client

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

Powered by Bun

Powered by Bun

CrumbJS runs on top of Bun, the next-generation JavaScript runtime. Enjoy blazing-fast startup times, a modern toolchain out of the box, and the performance you need to build APIs that scale — without extra setup.