@pawan-patil You are able to modify the source code and use it on your own site. You are only limited if you are intending to redistribute the code. If you intend to, then you must also open-source your changed code.
If in doubt, you'll want to contact a lawyer to review the GPLv3 license that comes with NodeBB.
I'll post some stuff here regarding my migration from SMF 2.x forum to NodeBB. I've had a forum for ~4 years and it's about time I revamped it. I'm a huge node.js and redis fan, so having a forum written in php is blasphemous.
