server.js

const http = require('http');
const fs = require('fs');
const path = require('path');

const PORT = 3000;

const MIME_TYPES = {
  '.html': 'text/html',
  '.js': 'text/javascript',
  '.css': 'text/css',
};

const server = http.createServer((req, res) => {
  let filePath = '.' + req.url;
  if (filePath === './') {
    filePath = './index.html';
  }

  const extname = String(path.extname(filePath)).toLowerCase();
  const contentType = MIME_TYPES[extname] || 'application/octet-stream';

  fs.readFile(filePath, (error, content) => {
    if (error) {
      if (error.code === 'ENOENT') {
        res.writeHead(404);
        res.end('File not found', 'utf-8');
      } else {
        res.writeHead(500);
        res.end('Sorry, check with the site admin for error: ' + error.code + ' ..\n');
      }
    } else {
      res.writeHead(200, { 'Content-Type': contentType });
      res.end(content, 'utf-8');
    }
  });
});

server.listen(PORT, () => {
  console.log(`🚀 Servidor en vivo (sin bundlers): http://localhost:${PORT}`);
  console.log(`Presiona Ctrl+C para detenerlo.`);
});