@a_5mith hmm,I know that,but I want to get topics in nodebb and show them in my another site.
Ahh, language barrier, I misinterpreted what you said. Erm, ok, well you could use the api to actually get the recent topics, that's not a problem.
It depends on what language/software you're using as to what you do. But the gist is you would send a get request to https://community.nodebb.org/api/recent or https://community.nodebb.org/api/recent/week (You'll want to link to your own NodeBB here for obvious reasons)
You would then loop through and grab
topics.slug and display them as you wanted.
Google will no doubt tell you how to grab info from an API in your chosen software/language though.