Web task demo - countdown api

index.js

"use latest"

const moment = require("moment");

/* When used with Webtask (https://webtask.io)
creates a simple API that returns the number of days between now
and the given `date`.

e.g. https://address.run.webtask.io/index?date=20180225

will return: 364
when run on Feb 25th, 2017 (one year earlier) */

module.exports = (ctx, done) => {
  const date = moment(ctx.data.date, 'YYYYMMDD');

  done(null, date.diff(moment(), 'days'));
}