@sports-alliance/sports-lib/inspect-session.js

A Library to for importing / exporting and processing GPX, TCX, FIT and JSON files from services such as Strava, Movescount, Garmin, Polar etc

const fs = require('fs');
const FitParser = require('fit-file-parser').default;

const file = 'samples/fit/jumps-mtb.fit';
const content = fs.readFileSync(file);

const parser = new FitParser({
  force: true
});

parser.parse(content, (error, data) => {
  if (error) {
    console.error(error);
  } else {
    if (data.laps && data.laps.length > 0) {
      console.log('Lap Object Keys:', Object.keys(data.laps[0]));
      console.log('Lap Object:', JSON.stringify(data.laps[0], null, 2));
    } else {
      console.log('No Laps found.');
    }

    // Also check session again just in case
    if (data.sessions && data.sessions.length > 0) {
      console.log('Session time_in_hr_zone:', data.sessions[0].time_in_hr_zone);
    }
  }
});