router.js

const routes = [
  { path: '/api/v1/websites/:website', method: 'GET', service: getWebsite },
  { path: '/api/v1/websites/:website', method: 'POST', service: createWebsite }
]

const notFound = (req, res) => res.end('Not found')

const api = proxyHandler(routes, { fallback: notFound })
http.createServer(api).listen(3000)

function proxyHandler (routes, { fallback }) {
  const compiledRoutes = map(
    r => Object.assign({}, r, { path: pathToRegexp() }),
    routes
  )
  return (req, res) => {
    const route = compose(
      r => r || fallback,
      find(r => r.method === req.method),
      filter(r => req.url.match(r.path))
    )(compiledRoutes)
    route(req, res)
  }
}