Nodejs measure execution time

express-middleware.js

async function logRouteExecTime(req, res, next) {
  const startTime = process.hrtime();
  res.once('finish', () => {
    const endTime = parseHrtimeToSeconds(process.hrtime(startTime));

    const payload = {
      server_method: req.method,
      server_url: `${req.baseUrl}${req.route ? req.route.path : ''}`,
      server_params: req.params,
      server_time: endTime,
      response_code: res.statusCode,
    };
    console.log('logRouteExecTime', JSON.stringify(payload));
  });
  next();
}

// first middleware assigned
app.use(logRouteExecTime);

timers-helpers.js

parseHrtimeToSeconds(hrtime, fixed = false) {
  const seconds = (hrtime[0] + (hrtime[1] / 1e9));
  if (fixed) {
    // 3 decimals for exposing the microseconds
    return seconds.toFixed(3);
  }
  return seconds;
}

function emitAndLogBackgroundExecTime(app, eventName, ...args) {
  const startTime = process.hrtime();

  function completedExecLogTime() {
    const endTime = parseHrtimeToSeconds(process.hrtime(startTime));

    const payload = {
      background_event: eventName,
      background_args: args,
      server_time: endTime,
    };
    console.log('logBackgroundExecTime', JSON.stringify(payload));
  }

  // event will finish on the function bellow since that's the last listener on the event
  app.once(eventName, completedExecLogTime);

  try {
    // emit the event on the app
    app.emit(eventName, ...args);
  } catch (err) {
    app.off(eventName, completedExecLogTime);
    completedExecLogTime();
    throw err;
  }
}

emitAndLogBackgroundExecTime(app, 'myEvent');