WebRTC

Here is the W3C standards compliant way to gather statistics from a WebRTC connection. This should work in all modern browsers.

// The async function allows using "await". You can also do pc.getStats().then(callback) in a non-async context.
(async () => {
  const report = await pc.getStats();
  for (let dictionary of report.values()) {
    console.log(dictionary.type);
    console.log('  id: ' + dictionary.id);
    console.log('  timestamp: ' + dictionary.timestamp);
    Object.keys(dictionary).forEach(key => {
      if (key != 'type' && key != 'id' && key != 'timestamp')
        console.log('  ' + key + ': ' + dictionary[key]);
    });
  }
})();

The list of statistics that will be returned can be found here.