This script converts fitness data downloaded from the Festina app into GPX format, which can be used with various fitness and mapping applications.

• Node.js (version 14 or higher)
• NPM (usually comes with Node.js)

1. Clone the repository or download and extract the ZIP archive.
2. Open a terminal/command prompt and navigate to the project directory.
3. Run npm install to install the required dependencies.

1. Export your fitness data from the Festina app in JSON format.
2. Save the exported JSON file to a location on your computer.
3. Open a terminal/command prompt and navigate to the project directory.
4. Run the following command to convert the JSON data to GPX format:

npm run convert -- /path/to/your/fitness-data.json

Replace /path/to/your/fitness-data.json with the actual path to the exported JSON file.

5. The script will create a new GPX file in the same directory as the input JSON file, with the same filename but with a .gpx extension. For example, if the input file is named fitness-data.json, the output file will be named fitness-data.gpx.
6. You can now import the generated GPX file into your preferred fitness or mapping application.

• The script combines location data with the last known heart rate value for each location data point.
• The GPX file generated by this script is compatible with various fitness and mapping applications, such as Strava, Garmin Connect, and Google Earth.
• This script is provided as-is, and there is no guarantee it will work with all fitness data exported from the Festina app. Please make sure to double-check the generated GPX file before using it with any other applications.
• The lion's share of the work was done by GPT-4 :)