I found a git repository for converting the data to JSON [1], along with instructions on how to use it [2]. However, the cldr-localenames package is not available on npm, and I didn't figure out how to rebuild it yet.
But I found another repository [3], in which I can simply run "npm install", and it downloads the XML data and converts it to JSON. The resulting data is very close to what is shipped in php-getttext-languages, and should be fine for my purposes. [1] https://github.com/unicode-cldr/cldr-json [2] http://cldr.unicode.org/development/updating-codes/updating-json-data [3] https://github.com/rxaviers/cldr-data-npm
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