How Does Ctrl-K work in Stackoverflow

Question

I am very curious to know how to implement the Ctrl-K (code sample) feature against code, For example:

public static void main(String args[]){
  System.out.println.out("welcome");
}

That will be nicely formatted?

1. Do we require any package to implement this?
2. Any ready made code available to do this?

Can any one help me with this? I am planning to develop a site where this feature would be a real helpful.

Answer 1

Do we require any package to implement this?

You need some software.

Any ready made code avaialble to do this?

SO uses markdown. There are implementations for most popular languages.

Answer 2

I guest you are looking for Google Javascript code prettifier.

As rsp mentioned in comments it works for following list of languages.