SVN Diff Parser
via npm:
$ npm install svn-diff-parser # use -g if you want to use diff2html
git diff [file|dir] > filename.diff
diff2html path/to/filename.diff > filename.html
var diffParser = require("svn-diff-parser");
var diffFiles = diffParser.parse(diffString);
console.log(diffFiles); // here have all info you need.