Minimal HTTP framework in Deno.

http.ts

interface route {
  path: string
  body: (path: string, values: Record<string, string>) => Promise<string | object | number> | string | object | number
}

const routes: route[] = [
  {
    path: "/resource/:value:",
    body: (_, values) => {
      return values.value
    }
  }
]

const route = async (path: string): Promise<Response> => {
  const transformedRoutes = routes.map((route) => {
    const path = route.path.replace(/\/:([^:]+):/g, "/(?<$1>[^/]+)\/?")
    return {path: new RegExp(`^${path}$`), body: route
    .body}
  })

  for (const route of transformedRoutes) {
    const match = path.match(route.path)

    if (match) {
      const values = match.groups
      const body = await route.body(path, values || {})
      return new Response(JSON.stringify(body), {status: 200})
    }
  }

  return new Response("Not found", {status: 404})
}

if (import.meta.main) {
  Deno.serve((req) => {
    return route(new URL(req.url).pathname)
  })
}