server.js

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

(port = process.argv[2] || 8888),
  (mimeTypes = {
    html: "text/html",
    jpeg: "image/jpeg",
    jpg: "image/jpeg",
    png: "image/png",
    svg: "image/svg+xml",
    json: "application/json",
    js: "text/javascript",
    css: "text/css",
    wasm: "application/wasm",
  });

http
  .createServer(function (request, response) {
    var uri = url.parse(request.url).pathname,
      filename = path.join(process.cwd(), uri);

    fs.exists(filename, function (exists) {
      if (!exists) {
        response.writeHead(404, { "Content-Type": "text/plain" });
        response.write("404 Not Found\n");
        response.end();
        return;
      }

      if (fs.statSync(filename).isDirectory()) filename += "/index.html";

      fs.readFile(filename, "binary", function (err, file) {
        if (err) {
          response.writeHead(500, { "Content-Type": "text/plain" });
          response.write(err + "\n");
          response.end();
          return;
        }

        var mimeType = mimeTypes[filename.split(".").pop()];

        if (!mimeType) {
          mimeType = "text/plain";
        }

        response.writeHead(200, { "Content-Type": mimeType });
        response.write(file, "binary");
        response.end();
      });
    });
  })
  .listen(parseInt(port, 10));

console.log(
  "Static file server running at\n  => http://localhost:" +
    port +
    "/\nCTRL + C to shutdown"
);