Roam — Fetch-Native Router for Bun, Deno, Workers & Node

Roam works natively on Bun, Deno, and Cloudflare Workers by calling router.fetch(request), since all three runtimes expose a fetch-style handler that expects a standard Request and returns a Response. A dedicated Node adapter (roam/node) lets you run the exact same router on Node's node:http server without any code changes to your routes.

No — Roam has zero runtime dependencies and relies entirely on the Web-standard Request and Response APIs that Bun, Deno, and Cloudflare Workers provide natively. No polyfills are needed on those runtimes; the Node adapter bridges the gap for Node without pulling in third-party packages.

Roam supports named parameters (e.g. :param) and wildcard segments (*), both of which are compiled to regular expressions at registration time for fast matching. There is no support for arbitrary custom regex patterns beyond these two constructs, keeping the API simple and predictable.

The package ships as ESM with bundled TypeScript declaration files (.d.ts), so you get full type safety and autocompletion without a separate @types install. It also includes a node:test suite and per-runtime example files covering Bun, Deno, Cloudflare Workers, and Node so you can get started immediately.

Roam uses an onion (layered) middleware model where each middleware can run logic before and after the next handler in the chain. You can organise routes with group() for shared prefixes or middleware, and mount() to attach an entirely separate router instance as a sub-application.

Roam automatically returns a 404 response when no route matches the request path, and a 405 response when the path matches but the HTTP method does not. The 405 response includes a correctly populated Allow header listing the methods that are registered for that path.