serve.js

// https://developer.mozilla.org/en-US/docs/Learn/Server-side/Node_server_without_framework

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

var root = './public';

http.createServer(function (request, response) {
  var url = new URL(request.url, 'http://' + request.headers.host);
  if (url.pathname === '/') {
    var filePath = root + '/index.html';
  } else {
    var filePath = root + url.pathname;
  }

  var extname = String(path.extname(filePath)).toLowerCase();
  var mimeTypes = {
    '.html': 'text/html',
    '.js': 'text/javascript',
    '.css': 'text/css',
    '.json': 'application/json',
    '.png': 'image/png',
    '.jpg': 'image/jpg',
    '.gif': 'image/gif',
    '.svg': 'image/svg+xml',
    '.wav': 'audio/wav',
    '.mp4': 'video/mp4',
    '.woff': 'application/font-woff',
    '.ttf': 'application/font-ttf',
    '.eot': 'application/vnd.ms-fontobject',
    '.otf': 'application/font-otf',
    '.wasm': 'application/wasm'
  };

  var contentType = mimeTypes[extname] || 'application/octet-stream';

  fs.readFile(filePath, function (error, content) {
    if (error) {
      if (error.code == 'ENOENT' || error.code == 'EISDIR') {
        fs.readFile(root + '/404.html', function (_error, content) {
          response.writeHead(404, { 'Content-Type': 'text/html' });
          response.end(content, 'utf-8');
        });
      }
      else {
        response.writeHead(500);
        response.end('Sorry, check with the site admin for error: ' + error.code + ' ..\n');
      }
    }
    else {
      response.writeHead(200, { 'Content-Type': contentType });
      response.end(content, 'utf-8');
    }
  });

}).listen(8080);
console.log('Server running at http://127.0.0.1:8080/');