server.js

import { createServer } from 'node:http';
import { readFile } from 'node:fs/promises';
import { extname, join } from 'node:path';
import { fileURLToPath } from 'node:url';

const PORT = 3000;
const ROOT = fileURLToPath(new URL('.', import.meta.url));

const MIME = {
  '.html': 'text/html; charset=utf-8',
  '.css':  'text/css; charset=utf-8',
  '.js':   'text/javascript; charset=utf-8',
};

createServer(async (req, res) => {
  const pathname = req.url === '/' ? '/index.html' : req.url;
  const filePath = join(ROOT, pathname);
  const mime = MIME[extname(filePath)] ?? 'text/plain';

  try {
    const content = await readFile(filePath);
    res.writeHead(200, { 'Content-Type': mime });
    res.end(content);
  } catch {
    res.writeHead(404, { 'Content-Type': 'text/plain' });
    res.end('404 Not Found');
  }
}).listen(PORT, () => {
  console.log(`Servidor corriendo en http://localhost:${PORT}`);
});