i think, too. thanks very much, sam. I don’t know how to thank you Thank you very much !
you’re great !
and it is up to you whether you publish this module. I will not adorn myself with foreign feathers!

without i have a black screen, with everythings fine.
another information:
age must be +1 but i think i will solve this alone. if not i’m too stuipid for this all :-)
so i can create my table now. but i see:
people who has birthday the same day:
date should be displayed once, and the names in the same , separated by

great, thanks !
to your information:
there are NO semikolons in your posted code. within them it goes !

ok, there is a light at the end of the tunnel:

question:
in the

socketNotificationReceived: function(notification, payload) {
		if(notification === "HAVEDATA") {
			var self = this;
               ...

payload should be the variable in which the jsonString is saved ?

done, it’s frozen now. must restart …

shame on me, sorry for that. now it’s changed to:

if(birth_date_moment.startOf('month').isSameOrAfter(now.startOf('month')) &&
					birth_date_moment.startOf('month').isSameOrBefore(birthday_time_window.startOf('month'))) {

nothing changed, i have configured the terminal-window to scroll about 3000 (!) lines, but can’t see the beginning …

node_helper.js:

var NodeHelper = require("node_helper");
var moment = require("moment");
// add require of other javascripot components here
// var xxx = require('yyy'); here
const csv = require("csvtojson");
var birthdaysArray = [];

module.exports = NodeHelper.create({

	init(){
		console.log("init module helper MMM-Perlchamp");
	},

	start() {

	},
	
	stop(){
		console.log("Stopping module helper: ",this.name);
	},

	// handle messages from our module// each notification indicates a different messages
	// payload is a data structure that is different per message.. up to you to design this
	socketNotificationReceived(notification, payload) {				
		var self = this;
		console.log("Starting module helper: ",this.name);

		// convert the csv-file into a JSON-String
		const csvFilePath = this.path + '/data/birthdays.csv';
		csv()
		.fromFile(csvFilePath)
		.then(function(jsonObj) {      
			JSON.stringify(jsonObj);

			// send data to [modulname].js
			self.sendSocketNotification("HAVEDATA", jsonObj);
		})		

		// if config message from module
		if (notification === "CONFIG") {
			// save payload config info
			this.config = payload;
			// wait 15 seconds, send a message back to module
			setTimeout(()=> {this.sendSocketNotification("message_from_helper"," this is a test_message")}, 15000);
		}
		else if(notification === "????2") {
	
		}
	},
});

MMM-Perlchamp.js:

Module.register("MMM-Perlchamp", {

	defaults: {
		language: "de",
		dimmEntries: true   // true: dims entries and the associated 
							//       symbol when the date has expired.
							// false: delete entries and the associated 
							//        symbol when the date has expired.
	},
	
	active_birthdays: {
		
	},


	init: function(){
		Log.log(this.name + " is in init!");
	},

	start: function(){
		Log.log("Starting module: " + this.name);

		// Set locale
		moment.locale(config.language);
	},

	loaded: function(callback) {
		Log.log(this.name + " is loaded!");
		callback();
	},

	// return list of other functional scripts to use, if any (like require in node_helper)
	getScripts: function() {
		return	["moment.js"];
	}, 

	// return list of stylesheet files to use if any
	getStyles: function() {
		return 	[this.data.path + "/css/MMM-Perlchamp.css"];
	},


	// only called if the module header was configured in module config in config.js
	getHeader: function() {
		return this.data.header;
	},

	// messages received from other modules and the system (NOT from your node helper)
	// payload is a notification dependent data structure
	notificationReceived: function(notification, payload, sender) {
		// once everybody is loaded up
		if(notification === "ALL_MODULES_STARTED"){
			// send our config to our node_helper
			this.sendSocketNotification("CONFIG",this.config);
		}
		if (sender) {
			Log.log(this.name + " received a module notification: " + notification + " from sender: " + sender.name);
		} else {
			Log.log(this.name + " received a system notification: " + notification);
		}
	},
	
	// messages received from from your node helper (NOT other modules or the system)
	// payload is a notification dependent data structure, up to you to design between module and node_helper
	socketNotificationReceived: function(notification, payload) {
		if(notification === "HAVEDATA") {

			var self = this;
			Log.log(this.name + " received a socket notification: " + notification + " - Payload: " + payload);
			var now = moment();
			for(var birthday of payload) {
				// get 1st 5 chars of birthdate, thru month
				// we will use this as the key in the hash
				var birth_date = birthday.birth.substring(0,5);
				
				// get the birthday as a moment in this year, for comparing
				var birth_date_moment = moment(birth_date + now.year(),"DD.MMYYYY");

				// u can add days to a moment object and then compare 
				//     if the birthdate is before that date (and after now)
				//     so within the next xx days

				// if the date is the same or later, don't use time of day
				if(birth_date_moment.startOf('day').isSameOrAfter(now.startOf('day')) &&
		   	  birth_date_moment.startOf('day').isSameOrBefore(birthday_time_window.startOf('day'))) {

					// birthday is in this month
					// check the hash if we've seen anything for today yet
					// if we haven't see this date yet
					if(this.active_birthdays[birth_date] == undefined){
           
						//  create the holder for its info (array of 
						//		names) in the hash
						this.active_birthdays[birth_date] = [];
					}
					// save the persons name on the list
					self.active_birthdays[birth_date].push({'name':birthday.name, 'age': now.diff(moment(birthday.birth,'DD.MM.YYYY'), 'years') })			     
			   }
			}
//					this.active_birthdays[birth_date].push(birthday.name);
//					this.active_birthdays[birth_date].push(birthday.name);
//				}
//
//			}
			Log.log("this.active_birthdays >>>>> ", this.active_birthdays);

/*			
//			var currentMonth = new Date().toLocaleDateString('en', {month:'2-digit'});
			var currentMonth = moment().format("MM");
			var result = Object.entries(payload
			.filter(({birth}) => birth.split('.')[1] === currentMonth)
			.reduce((a, {birth, name}) => {
				const day = +birth.split('.')[0];
				a[day] = [...(a[day] || []), name];
				return a
			}, {})
			).map(([day, name]) => ({day, name})).sort((a, b) => +a.day - b.day);
			console.log("LISTE >> ", result);
*/     


			// tell MM to call and get our content
			self.updateDom();
		}     			
	},

	// system notification your module is being hidden
	// typically you would stop doing UI updates (getDom/updateDom) if the module is hidden
	suspend: function() {

	},

	// system notification your module is being unhidden/shown
	// typically you would resume doing UI updates (getDom/updateDom) if the module is shown
	resume: function() {

	},

	// this is the major worker of the module, it provides the displayable content for this module
	getDom: function() {
		var self = this;
		var wrapper = document.createElement("div");
		
		// tell MM to call and get our content
Log.log(JSON.stringify(this.active_birthdays))    // add this line
			self.updateDom();                          // before this line in the notification code..

		for(var birthday of Object.keys(this.active_birthdays)) {
			for(var name of this.active_birthdays[birthday]) {
				var m = document.createElement("div");
				Log.log("BIRTHDAY >> " + birthday);
				Log.log("NAME >> " + name);
				m.innerText = birthday + " " + name;
				wrapper.appendChild(m);
			}
		}

		// pass the created content back to MM to add to DOM.
		return wrapper;
	}
})

birthdays.csv in folder MMM-Perlchamp/data:

birth,name
03.01.1940,aaa AAAAA
06.01.1969,bbb BBBBB
15.02.1939,ccc CCCCC
07.03.1972,ddd DDDDD
10.05.1969,eee EEEEE
16.05.2012,fff FFFFF
16.05.1988,ggg GGGGG
27.05.2002,hhh HHHHH
08.07.1976,iiii IIIII
13.07.1914,jjj JJJJJ
27.08.1968,kkk KKKKK
21.09.1967,lll LLLLL
13.10.1965,mmm MMMMM
16.10.2010,nnn NNNNN
23.10.1941,ooo OOOOO
19.12.1935,ppp PPPPP

MMM-Perlchamp.css in folder MMM-Perlchamp/css

.MMM-Perlchamp header {
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 20px;
  font-family: "Roboto Condensed", Arial, Helvetica, sans-serif;
  font-weight: 400;
  border-bottom: 1px solid #444444;
  line-height: 20px;
  padding-bottom: 5px;
  color: #ffffff;
/*
  font-variant: small-caps;
*/
}

i could send you the three files (node_helper.js, MMM-Perlchamp.js, birthdays.csv) via email ?

i got this:

[2020-05-02 18:10:50.465] [LOG]    {} (/home/dirk/MagicMirror/modules/MMM-Logging/node_helper.js:34 Class.socketNotificationReceived)

for each entry. i have 5 birthdays in may …