This is a basic function to add an event into a calendar using Node.js and the CalDAV protocol

Add an event in CalDAV with Node.js

/**
 * On message callback, called when a message (of any type) is detected with the real time messaging API
 * @param {object} event
 * @param {string} url (CalDAV Server URL)
 * @param {string} user (CalDAV Username/Email)
 * @param {string} user (CalDAV Password) 
 * @param {function} cb (Callback function)
 * 
 * The object event needs the following attributes:
 * event.key - A random string which will be the unique ID of the event in CalDAV
 * event.summary - Description/Title of the event
 * event.startDate - Starting time of the event
 * event.endDate - Ending time of the event
 * 
 * I have used moment.js to convert the startDate/endDate in actual Dates, so the date
 * doesn't need to be formatted, the function will format it.
 */
addEvent: function (event, url, user, pass, cb) {

    var urlparts = /(https?)\:\/\/(.*?):?(\d*)?(\/.*\/?)/gi.exec(url);
    var protocol = urlparts[1];
    var host = urlparts[2];
    var port = urlparts[3] || (protocol === "https" ? 443 : 80);
    var path = urlparts[4] + event.key;

    var body = 'BEGIN:VCALENDAR\n' +
               'BEGIN:VEVENT\n' +
               'UID:' + event.key + '\n' +
               'SUMMARY:' + event.summary + '\n';
    
    var _startDateBody, _endDateBody;
    
    var format_allDay = "YYYYMMDDTHHmms";
    var format_singleEvent = "YYYYMMDD";

    if(moment(event.startDate).hour() === 0) {
      _startDateBody = 'DTSTART;VALUE=DATE:' + moment(event.startDate).format(format_singleEvent) + '\n';
    } else {
      _startDateBody = 'DTSTART:' + moment(event.startDate).format(format_allDay) + 'Z\n';
    }
    
    if(moment(event.endDate).hour() === 0) {
      _endDateBody = 'DTEND;VALUE=DATE:' + moment(event.endDate).add(1, 'days').format(format_singleEvent) + '\n';
    } else {
      _endDateBody = 'DTEND:' + moment(event.endDate).format(format_allDay) + 'Z\n';      
    }

    body += _startDateBody + 
            _endDateBody +   
            'END:VEVENT\n' +
            'END:VCALENDAR';
    
    var options = {
      rejectUnauthorized: false,
      hostname          : host,
      port              : port,
      path              : path,
      method            : 'PUT',
      headers           : {
        "Content-type"  : "text/calendar",
        "Content-Length": body.length,
        "User-Agent"    : "calDavClient",
        "Connection"    : "close",
        "Depth"         : "1"
      }
    };    
    
    if (user && pass) {
      var userpass = new Buffer(user + ":" + pass).toString('base64');
      options.headers["Authorization"] = "Basic " + userpass;
    }

    var req = https.request(options, function (res) {
      var s = "";
      res.on('data', function (chunk) {
        s += chunk;
      });

      req.on('close', function () {
        if(s === "") {
          cb(true);
        } else {
          cb(false);
        }
      });
    });

    req.end(body);

    req.on('error', function (e) {
      console.log('problem with request: ' + e.message);
    });        
  }

Hi I tried adding event and getting event using node-caldav-mod but it is failing if I am using caldav URL and adding is not working at all.

This is the js file which I created. Could you please help me out with this? I have been breaking my head over this from more than a week

var caldav = require("node-caldav-mod");
var moment = require('moment-timezone');
var express = require('express');
var app = express();
var xmljs = require("libxmljs");
var https = require("https");
var parseString = require('xml2js').parseString;


var url = "https://calendar.zoho.com/caldav/";
var username = "username"
var password = "password"
var timeFormat = "YYYYMMDDTHHmms";

var addTodayEvents = function(callback){
var start_date = moment().set({'hour': 0, 'minute': 0, 'second': 10}).format(timeFormat) + "Z";
var end_date = moment().set({'hour': 23, 'minute': 59, 'second': 59}).format(timeFormat) + "Z";
var output = {};
var event = {
	key: "1231",
	summary: "Meeting",
	startDate: "20161016",
	endDate: "20161016"
	}
  console.log("-----event------")
  console.log(event);
  caldav.addEvent(event,url,username,password,function (res){
  console.log("........URL..........")
  console.log(url);
  callback(res);
  })
}



var getTodayEvents = function(callback){
    var query_start_date = moment().set({'hour': 0, 'minute': 0, 'second': 10}).format(timeFormat) + "Z";
    var query_end_date = moment().set({'hour': 23, 'minute': 59, 'second': 59}).format(timeFormat) + "Z";
    var output = {};
    output.start_date = query_start_date;
    output.end_date = query_end_date;

    caldav.getEvents(url, username, password, query_start_date, query_end_date, function(res){
        callback(res);
    });
}


app.get('/today', function(request, response){
    getTodayEvents(function(events){
        response.send(events);
    }) 
});

	app.post('/event',function(request,response){
	addTodayEvents(function(request){
	response.status(200).send(events);
	})
	})

app.listen(3000,function(){
    console.log("Listening on port 3000..");
})