The first time I heard of GeoJSON was two days ago and I never worked with AutoCAD before, too. At least I was able to convert from DWG to DXF already (Does someone know a way to do this over the Windows console?) and then I tried to convert the file from DXF to a GeoJSON, but when I openend it in any online GeoJSON Viewer, it really didn't look like the DXF. Text, colors and some elements are missing. For the conversion I used GDAL and the command:
ogr2ogr -f geojson output.geojson input.dxf
The final result will be displayed in an online application called "servicenow" and will be used to display floor plans. Therefore I don't want to mark something on a map, but just want to have a floor plan as a GeoJSON file. Are there any viewers which just show the plan on not any map in the background?