Nodejs: Where or How to write complicated business logic?

Question

Recently I got introduced to node.js and cool packages like express and jade. I have few questions consistently knocking my door:

If I pick node.js to build my next webs

Answer 1

Of course, you can use Python, PHP, c++ or other technologies with nodejs 'cuz node can run it as a child process. Nodejs give you the freedom to use any technology which you want inside itself. You can use whatever you want combining the most performance programs.