is this fully open sourced. I have to use this for a business purpose?

[Amrit Pk]

is this fully open sourced. I have to use this for a business purpose?

[yariplus]

Yes, commercial use is allowed.

NodeBB/LICENSE at master · NodeBB/NodeBB

Node.js based forum software built for the modern web - NodeBB/LICENSE at master · NodeBB/NodeBB

GitHub (github.com)

[julian]

To be specific, you are allowed to use NodeBB to host for most purposes, although you are not allowed to redistribute changed copies of NodeBB unless you also publish that source code.