It's a small web service that wraps around a Java library named Flying Saucer, so there isn't anything to look at really.

Flying Saucer excels against the alternatives I looked at in a few ways. First, Pandoc's built in PDF writer uses a LaTeX intermediary which doesn't support anything that web writers have come to expect. Second, the other tools were webkit based which variously didn't support the page media spec, didn't support embedding fonts, or both. Others were custom one off of desktop tools that wouldn't work how I need for Docverter.