Thanks for all the help.
I ended the project because I found a module that allready hat the function that I was looking for.

You came up with some good information, thx for the help.

i would use my loop, which covers every entry.
i dont understand your file data

see the online doc for exact syntax

I have this now, and this is working.

for(let type of Object.keys(obj)){
var date = obj[type];
console.log(type, date);
}

This will show the correct type and date.
But I have something in mind, that look like this:

if date === currentdate {
picture=type+"Div"}

ex:  
20.02.2021 === 20.02.2021 then var piture= "bigDiv"

picture is then displayed.

but this have to be a loop, because there can be same dates but with different types(pictures)

Does this gives any meaning? its hard to descripe, but I’m realy glad for all the help I get.

for( let entry of object.RecylingDates){
  if (entry.Type ==='House'){
      if(entry.Date==='........'){
      }
   }
}

you can use moment().format(???)
where ??? is the layout of yiur date strings to get something for today, tomorrow…

It now works, I can get data into my new object.

My new json file look like this:

{
  "RecyclingDates": [
{ "Type": "House", "Date": "02.01.2021"},
{ "Type": "House", "Date": "08.01.2021"},
{ "Type": "House", "Date": "15.01.2021"},
{ "Type": "Glass", "Date": "22.01.2021"},
{ "Type": "Glass", "Date": "29.01.2021"},
{ "Type": "Glass", "Date": "05.02.2021"},
{ "Type": "Garden", "Date": "12.02.2021"},
{ "Type": "Garden", "Date": "19.02.2021"},
{ "Type": "Garden", "Date": "26.02.2021"},
{ "Type": "Garden", "Date": "05.03.2021"},
{ "Type": "Big", "Date": "12.03.2021"},
{ "Type": "Big", "Date": "19.03.2021"},
{ "Type": "Big", "Date": "26.03.2021"}
]
}

I get this object output:

Object
RecyclingDates: Array(13)
0:
Type: "House"
Date: "02.01.2021"
__proto__: Object
1:
Type: "House"
Date: "08.01.2021"
__proto__: Object
2: {Type: "House", Date: "15.01.2021"}
3: {Type: "Glass", Date: "22.01.2021"}
4: {Type: "Glass", Date: "29.01.2021"}
5: {Type: "Glass", Date: "05.02.2021"}
6: {Type: "Garden", Date: "12.02.2021"}
7: {Type: "Garden", Date: "19.02.2021"}
8: {Type: "Garden", Date: "26.02.2021"}
9: {Type: "Garden", Date: "05.03.2021"}
10: {Type: "Big", Date: "12.03.2021"}
11: {Type: "Big", Date: "19.03.2021"}
12: {Type: "Big", Date: "26.03.2021"}
length: 13

I opend “0” and “1” in the object, so you can see how its stored in the object.

How do I access these values in my module.js file. I hope to make a loop/compare of the array.
My plan is to show different pictures according to the Type and if the Date is equale to current date.

full node_helper.js above, tested, working
need to get path to file in module folder (not current folder)

sends object to module to make decisions on what to display

trigger
just say nothing happens in node helper without some event

this should get the file contents and send to modulename.

modulename.js sends socketNotification to helper w config info to start the process

What do you meen by " need some trigger function"? is that in the node_helper.js or where should it be?

modulename.js sends node_helper a socket notification w the module config info
node_helper sends the data back as object
Should I write some code in the modulename.js that call file read or do you mean that this is the place to make the compare?

var NodeHelper = require("node_helper");
const fs = require('fs')
const path = require('path')
// add require of other javascripot components here
// var xxx = require('yyy') here

module.exports = NodeHelper.create({


	// 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) {
		console.log(this.name + " received a socket notification: " + notification + " - Payload: " + payload);
		// if config message from module
		if (notification === "CONFIG") {
			// save payload config info
			this.config=payload
			let p = path.resolve('.','modules',this.name,this.config.filename)
			console.log("file="+p)
			fs.readFile(p, (error,filedata)=> {
			console.log("filedata="+filedata)
			let data =JSON.parse(filedata)
			this.sendSocketNotification('filedata', data)
			})
		}
	},
});