试试js-beautify 。

这是一个JS美化工具，但也适用于HTML。

I was wondering if there is any tool or generator that could auto indent my code after production from:

<div>
<div>
<p>
</p>
</div>
</div>

to:

<div>
     <div>
          <p>
          </p>
     </div>
</div>

Does something like this exist?

Try js-beautify.

It's a JS beautifier but works for HTML too.