server.js

'use strict';

const http = require('node:http');

const PORT = 8000;

const user = { name: 'jura', age: 22 };

const routing = {
  '/': '<h1>welcome to homepage</h1><hr>',
  '/user': user,
  '/user/name': () => user.name.toUpperCase(),
  '/user/age': () => user.age,
  '/hello': { hello: 'world', andArray: [1, 2, 3, 4, 5, 6, 7] },
  '/api/method1': (req, res) => {
    console.log(req.url + ' ' + res.statusCode);
    return { status: res.statusCode };
  },
  '/api/method2': (req) => ({
    user,
    url: req.url,
    cookie: req.headers.cookie
  }),
};

const types = {
  object: (o) => JSON.stringify(o),
  string: (s) => s,
  undefined: () => 'not found',
  function: (fn, req, res) => JSON.stringify(fn(req, res)),
};

http.createServer((req, res) => {
  const data = routing[req.url];
  const type = typeof data;
  const serializer = types[type];
  const result = serializer(data, req, res);
  res.end(result);
}).listen(PORT);

// http.createServer((req, res) => {
//   const data = routing[req.url];
//   res.end(types[typeof data](data, req, res));
// }).listen(PORT);

setInterval(() => user.age++, 2000);