$ npm install --save worktop

import { Router } from 'worktop';
import * as Cache from 'worktop/cache';
import { uid as toUID } from 'worktop/utils';
import { read, write } from 'worktop/kv';
import type { KV } from 'worktop/kv';
declare var DATA: KV.Namespace;
interface Message {
  id: string;
  text: string;
  // ...
}
// Initialize
const API = new Router();
API.add('GET', '/messages/:id', async (req, res) => {
  // Pre-parsed `req.params` object
  const key = `messages::${req.params.id}`;
  // Assumes JSON (can override)
  const message = await read<Message>(DATA, key);
  // Alter response headers directly
  res.setHeader('Cache-Control', 'public, max-age=60');
  // Smart `res.send()` helper
  // ~> automatically stringifies JSON objects
  // ~> auto-sets `Content-Type` & `Content-Length` headers
  res.send(200, message);
});
API.add('POST', '/messages', async (req, res) => {
  try {
    // Smart `req.body` helper
    // ~> parses JSON header as JSON
    // ~> parses form-like header as FormData, ...etc
    var input = await req.body<Message>();
  } catch (err) {
    return res.send(400, 'Error parsing request body');
  }
  if (!input || !input.text.trim()) {
    return res.send(422, { text: 'required' });
  }
  const value: Message = {
    id: toUID(16),
    text: input.text.trim(),
    // ...
  };
  // Assumes JSON (can override)
  const key = `messages::${value.id}`;
  const success = await write<Message>(DATA, key, value);
  //    ^ boolean
  // Alias for `event.waitUntil`
  // ~> queues background task (does NOT delay response)
  req.extend(
    fetch('https://.../logs', {
      method: 'POST',
      headers: { 'content-type': 'application/json '},
      body: JSON.stringify({ success, value })
    })
  );
  if (success) res.send(201, value);
  else res.send(500, 'Error creating record');
});
API.add('GET', '/alive', (req, res) => {
  res.end('OK'); // Node.js-like `res.end`
});
// Attach "fetch" event handler
// ~> use `Cache` for request-matching, when permitted
// ~> store Response in `Cache`, when permitted
Cache.listen(API.run);