HTML5 API: Geolocation --> getCurrentPosition()

geolocation.js

if ('geolocation' in navigator) {
  const { geolocation } = navigator;
  geolocation.getCurrentPosition(success, error);

  function success(position) {
    const { coords } = position;
    const p = document.querySelector('p');
    p.innerHTML = `
      <strong>LAT:</strong> ${coords.latitude}<br>
      <strong>LNG:</strong> ${coords.longitude}
    `;
  }
  function error(error) {
    console.error(error);
  }
}

index.js

// Generate a self signed certificate
// openssl req -nodes -new -x509 -keyout dwaps.key -out dwaps.cert

const app = require('express')();
const { readFileSync } = require('fs');

const key = readFileSync('dwaps.key');
const cert = readFileSync('dwaps.cert');

require('https').createServer(
  { key, cert },
  app.get(
    '/',
    (req, res) => {
      const scriptGeolocation = readFileSync('geolocation.js');
      res.end(`<p></p><script>${String(scriptGeolocation)}</script>`);
    })
).listen(8081);