MongoDB is the recommended data store.
For development I use redis because it is just easier for me to use (e.g. zrange sortedSet 0 -1 vs db.objects.find({ _key: "sortedSet" }).pretty();)
All three are supported by the NodeBB team 😄
Is there any REST API to register? If so, how to do that?
@corbit09 try this plugin https://github.com/NodeBB/nodebb-plugin-write-api