server.js

var http = require("http");
var url = require("url");
var fs = require("fs");

var server = http.createServer(function (req, res) {
  var req_path = url.parse(req.url).pathname;
  var filepath = __dirname + req_path;

  fs.exists(filepath, function (exists) {
    if (exists) {
      fs.stat(filepath, function (err, stats) {
        if (err) {
          res.writeHead(500, { 'Content-Type': 'text/html;charset=utf8' });
          res.end('<div styel="color:black;font-size:22px;">server error</div>');
        } else {
          if (stats.isFile()) {
            var file = fs.createReadStream(filepath);
            res.writeHead(200, { 'Content-Type': 'text/html;charset=utf8' });
            file.pipe(res);
          } else {
            fs.readdir(filepath, function (err, files) {
              var str = '';
              for (var i in files) {
                str += files[i] + '<br/>';
              }
              res.writeHead(200, { 'Content-Type': 'text/html;charset=utf8' });
              res.write(str);
            });
          }
        }
      });
    } else {
      res.writeHead(404, { 'Content-Type': 'text/html;charset=utf8' });
      res.end('<div styel="color:black;font-size:22px;">404 not found</div>');
    }
  });
});
server.listen('9090', '127.0.0.1');