I have this GeoJSON file which uses the following projection: EPSG:28992. I want to convert this to EPSG:3857 but I don't have GIS software available. I have tried ogre, but when I first convert it to a shapefile and then back to GeoJSON using the aforementioned projections, it still shows coordinates with extremely high numbers (476628.5890141478,6820821.561640609 etc). The same applies when I try converting it using reproject.
In both cases when I try loading the converted files into geojson.io it fails -- it doesn't show on the map. In EPSG:3857, I'm expecting something like 4.30, 52.08 instead of coordinates that are in the hundreds of thousands.
Any idea what I am doing wrong or how to get the right values?