Quick and dirty JS for processing ForeFlight KML/GeoJSON properties into timestamps for kepler.gl

convert.js

const fs = require('fs');

fs.readFile("input.geojson", function(err, data) { 
    if (err) throw err; 
    let track = JSON.parse(data); 

    for (let i = 0; i < track.features[0].geometry.coordinates.length; i++) {
        let timestamp = Date.parse(track.features[0].properties.coordTimes[i])
        track.features[0].geometry.coordinates[i][3] = timestamp
    }
    fs.writeFileSync('output.geojson',JSON.stringify(track))

    console.log('done!')
});