This used to be part of PagePark, but it seems too useful to bury there. Now that I know how to create an NPM object, this seemed a good thing to factor out. May a thousand JavaScript OPML apps bloom.
npm install daveopml
If you have a question or comment, post an issue in the repository.
Dave Winer
1/24/18 by DW
Added an optional flExpandIncludes param on readOpmlFile.