How does that even make sense? The PLN file, and the data it contains, are not something that would map into a JSON framework in any way that would be usable by anyone even if a special add-on were created to do that. It is possible to export some per-element data from Archicad, but not in JSON format. Perhaps you could explain what your client hopes to actually receive? I wonder if even they know what they are asking.
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.6, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB
