README
Example output
Usage
bundle exec ruby main.rb > graph.gexf
Now, open that file (graph.gexf) with Gephi, and you should see a graph that was generated with your Joplin database. Given that you have links between your notes. Otherwise it'll be only dots everywhere and no link between them.
Debugging
If you have issues opening your gexf file with Gephi, try this:
xmllint --noout --schema basic-gexf-1.2.xsd graph.gexf
It will show you what are the issues you need to fix for the xml to be valid.