A simple parser that I made for handling parsing of Strava GPX files to geoJSON, and simplifying the geometry.
This reduces the files a lot and makes it more manageable in a map. The attached GPX file is 223kb, but the geoJSON ends up at less than 4kb, while still retaining most of the information that's required for a map path. GPX files can be huge as my Garmin logs every second, and this is a simple way to reduce the size of the file.
The geometry is simplified using Ramer-Douglas-Peucker algorithm, thanks to the implementation at https://github.com/seabre/simplify-geometry
It's not been made for any other types of geometry than LineStrings as that is my use case.
import parser from "@bovan/gpx2geojson";
// define url to gpx file
const gpxDir = path.join(__dirname, "DIR_NAME_CONTAINING_GPX");
const fileName = "run.gpx";
export async function parseGpx() {
// Read the GPX file to a variable
const gpxData = await readFile(path.join(gpxDir, fileName), "utf8");
// parse the gpx data to geoJSON
const simplifiedGeoJSON = parser(gpxData);
// Do something with the simplified geoJSON, like putting it in a map
return simplifiedGeoJSON;
}