How to access hono routing params?

[FraBle]

Hono supports named path parameters. How would one access those using the UniversalHandler?

Example

app.get('/user/:name', (c) => {
  const name = c.req.param('name')
  ...
})

[magne4000]

I was going to say that named path parameters are not a universal concept, but in fact, many servers do implement this feature (fastify, express, hattip, hono, h3).

For servers that support it, I could add route parameters under the runtime argument (which is not yet documented, as its still WIP).

But what to do when an adapter does not support support it? For instance the Cloudflare adapter as no concept of routes.

I guess that something like that could do the trick:

import { parseRoute } from `@universal-middleware/core`;

interface Options {
  route?: '/user/:name'
}

export const handler = ((options?: Options) => async (request, context, runtime) => {
  const name =
    // hypothetical route params on `runtime`
    runtime.params?.name ??
    // hypothetical `parseRoute` helper as a fallback, using `path-to-regexp` for instance
    parseRoute(request, options);
  
  if (!name) throw new Error("'name' route parameter required");
  
  // ...
}) satisfies Get<[Options | undefined], UniversalHandler>;

[magne4000]

It could be even more generic

interface Options {
  extractName?: (request: Request, context: Universal.Context, runtime: Runtime) => string;
}

export const handler = ((options?: Options) => async (request, context, runtime) => {
  const name =
    runtime.route('name') ??
    options?.extractName(request, context, runtime);
  
  if (!name) throw new Error("'name' route parameter required");
  
  // ...
}) satisfies Get<[Options | undefined], UniversalHandler>;

[magne4000]

Added by #29.

Route parameters recipe example.

[FraBle]

Thank you for adding this feature and extensive example in such a short time. 🙇