Make a tsv file out of a geojson blob. The properties must all be consistent or this won't really work.

makeTsv.js

const geojson = require('file.geojson');

function makeLine(object){
    return Object.keys(object).map(key => {
        const value = object[key];
        if(!['string', 'number'].includes(typeof value)) return '-';
        return value;
    }).join('\t')
}

require('fs').writeFileSync('tsv.tsv', [
    Object.keys(geojson.features[0].properties).join('\t'),
    cables.features.map(feature => makeLine(feature.properties)).join('\n')
].join('\n'))