Kismet stores packets as binary data in the kismetdb log file.
Packet data can be invaluable for processing log files - but it can also take up space, and reveal sensitive information. Before sharing a packet log (for instance with future sites which accept kismetdb logs directly), you should strip the packet content.
kismetdb_strip_packets tool will retain all metadata - MAC addresses, signal, and location - but will erase the contents of the packets.
$ kismetdb_strip_packets --in some-kismet-file.kismet --out some-other-file.kismet
This tool is available as part of Kismet when built from source, or in the kismet-logtools package, as of Feb 2019.
There are several optional parameters you can use when exporting a JSON file:
--verboseAdd more status output to the console while
kismetdb_strip_packetswill not overwrite the target file if it exists already.
--forcewill cause it to clobber the destination.
kismetdb_strip_packetsruns a SQL Vacuum command to optimize the database and clean up any journal files. Skipping this process will save time on larger captures.