I wrote two Joplin plugins today.

1. Auto create tags based on any content in title or body with a hashtag repo
2. Auto alarm creation based on natural language in title repo. With this I can type notes like, “Write blog post due at 4pm tomorrow” and have the alarm auto-set :).

The Joplin plugin interface was clean and simple once I browsed through the docs and a few example plugins.

PS - Thanks to @forcewake on Github for the plugin that accounts for 50% of the code in my auto-tag plugin repo