npm install moment-feiertage --save
This (moment-feiertage) is a Moment.js plugin to determine if a date is a German holiday. Holidays are taken from Wikipedia (de). It's a bit complicated to determine if a date is a holiday, because religious holidays vary every year and differ within the 16 German states.
Made by DaniSchenk.
var someDateInSomeStates = moment('2018-11-01').isHoliday(['BW', 'SH', 'TH']);
/* returns {
allStates: false,
holidayName: 'Allerheiligen',
holidayStates: [ 'BW' ],
testedStates: [ 'BW', 'SH', 'TH' ]
}*/
The repository is located at github.com/DaniSchenk/moment-feiertage.