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

Ryan did not start with JavaScript. A large part of why Node was created in JavaScript is that JavaScript lacked vast oceans of libraries.

Those vast oceans of libraries are almost all written in blocking code.

To take full advantage of Node.js you need to limit your self to non blocking libraries. Which means that might need to write some libraries to complete your project in Node.js.