@charles one can make an import plugin, but an easiest and efficient way for (quick) testings will be just with redis data dump file. First, load redis with data file, and that's it.
However, I agree that the importer can be better at some point.
Hello nodebb first install but I do not know where to download files
Link files final : https://github.com/NodeBB/NodeBB/archive/master.zip