GeoJSON processing - other data in GeoJSON file not being preserved

[siromega]

I have a GeoJSON file I am processing through Mapshaper.

{"type":"FeatureCollection", "features":[ ..... ], "metadata":{"errata":[], "totalFeatures":23,"timeStamp":"2026-05-15T10:27:03.221Z"},"crs":{"type":"name","properties":{"name":"urn:ogc:def:crs:EPSG::4326"}}}

Unfortunately it is keeping the features and nothing else. The metadata and crs properties are not being preserved. This is the command I am running.

npm exec -- mapshaper -i $file --clean allow-overlaps --filter-slivers remove-empty -o $file force metadata

Thank you.

[mbloch]

It looks like your file is using the old-style GeoJSON crs member (which some sotware continues to support, even though it has been dropped from the GeoJSON spec). If you just want mapshaper to preserve the metadata and crs properties in your file and re-export them, that should be doable. I think mapshaper needs to be aware that crs contains coordinate system information, and not re-export crs when a user reprojects their data using the -proj command. You're not reprojecting, so re-exporting crs would be fine. So if mapshaper preserves non-standard fields but doesn't try to use the crs property, would that be satisfactory?

[siromega]

Yes that would work. Thank you, I appreciate your quick response!