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 😄
Hi @kartic,
Right now shared server providers using WHM/CPanel are finding it tough to integrate Node.js, as it is a standalone application (with its own bundled web server), unlike apps like wordpress/drupal, which are PHP based.
Until such a time as this is supported, you're going to have to install NodeBB on a virtual private server (i.e. Linode, Digital Ocean)