Hi Alexander,
Please see:
Test data(input/output/QGIS)
5077-TopoJson -TopoJson.zip (9.3 KB)
If the input is not valid - this is .json extension , please give me valid .json sample for TopoJson
that I will make full…...and save to avoid rounding errors that may break the topology...render by viewer. It’s actually correct topoJson file and can be usefull...