This is a simple fork of mapbox/togeojson. I use it to prepare data for an application that does not make use of coordTimes and to reduce filesize and complexity I've added a -n=true switch that outputs an empty array into the resulting GeoJSON.
Although I use .gpx traces exclusively I have modified the section dealing with .kml to generate the same output. It's only been casually tested.
Processing the largish GPX trace from test/data/osm.gpx–
./togeojson test/data/osm.gpx > with.json
./togeojson -n=true test/data/osm.gpx > without.json
–we see an 18% size reduction.
-rw-r--r-- 1 erictheise staff 665K Oct 15 19:03 with.json
-rw-r--r-- 1 erictheise staff 562K Oct 15 19:03 without.json