What tools exist for manipulating HTML in Node.js?

I have a Node.js/Express application which takes user input as HTML, and I need to make it both well-formed and remove or replace all but a small subset of allowed tags. What are the existing options for doing so?

For example, after cleaning, I might want to regard <div><br></div> as empty and remove it, and replace <div>Text</div> with <p>Text</p>.

EDIT

@kaareal suggests htmltidy, which deals nicely with the cleaning it up part. How can I take this clean output and remove or replace elements?