{
        module: "MMM-Futar",
        position: "top_left",
        header: 'Ráckeve -> Közvágóhíd',
        config: {
            stopId: 'BKK_007947',  // Ráckeve
            routeId: 'BKK_H6',
        }

that is missing the } of the module:

so the following stuff becomes part of the last futar module block

remove this from config.js

{
        minutesAfter: 50,
        hideStopTimesInNextMinutes: 0,
        updateInterval: 60000, // 1 minute in milliseconds
        showHead: true, // true | false
        showSymbolInHead: true, // true | false
        showSymbolInStopTime: false, // true | false
        showRouteNameInStopTime: false, // true | false
        maxNumberOfItems: 3,
        align: 'left', // 'left' | 'right'
        fade: true,
        fadePoint: 0.25,
        coloredSymbolInHead: true, // true | false
        coloredTextInHead: true, // true | false
        coloredSymbolInStopTime: true, // true | false
        coloredRouteNameInStopTime: true, // true | false
        symbolColors: {
          tram: '#ffcf42', // yellow-ish
          bus: '#1a9fed', // blue-ish
          subway: '#b3090c', // red-ish
          trolleybus: '#931517', // dark red-ish
          rail: '#5cbc82', // green-ish
          ferry: '#1a52ed' // dark-blue-ish
        },
}

, as soon as i edit the config js

{
            module: "MMM-Futar",
            position: "top_left",
            header: 'Közvágóhíd -> Ráckeve',
            config: {
                stopId: 'BKK_009628',  // Közvágóhíd
                routeId: 'BKK_H6,
            }
        },
        {
            module: "MMM-Futar",
            position: "top_left",
            header: 'Ráckeve -> Közvágóhíd',
            config: {
                stopId: 'BKK_007947',  // Ráckeve
                routeId: 'BKK_H6',
            }

it stop working

it is missing the REQUIRED module: , position: and config: {} sections

this stuff

  {
        minutesAfter: 50,
        hideStopTimesInNextMinutes: 0,
        updateInterval: 60000, // 1 minute in milliseconds
        showHead: true, // true | false
        showSymbolInHead: true, // true | false
        showSymbolInStopTime: false, // true | false
        showRouteNameInStopTime: false, // true | false
        maxNumberOfItems: 3,
        align: 'left', // 'left' | 'right'
        fade: true,
        fadePoint: 0.25,
        coloredSymbolInHead: true, // true | false
        coloredTextInHead: true, // true | false
        coloredSymbolInStopTime: true, // true | false
        coloredRouteNameInStopTime: true, // true | false
        symbolColors: {
          tram: '#ffcf42', // yellow-ish
          bus: '#1a9fed', // blue-ish
          subway: '#b3090c', // red-ish
          trolleybus: '#931517', // dark red-ish
          rail: '#5cbc82', // green-ish
          ferry: '#1a52ed' // dark-blue-ish
        },
}

if you have read the config js evrything is there, the module name position etc

{
        module: 'MMM-Futar',
        position: 'top_center',
        config: {
        stopId: 'BKK_044033',
        routeId: '',
        }
    },
        {
        module: 'MMM-Futar',
        position: 'top_center',
        header: 'Ráckeve -> Közvágóhíd',
        config: {
        stopId: 'BKK_007947',  // Ráckeve
        routeId: 'BKK_H6',
        }
        },
        {
        module: "MMM-Futar",
        position: "top_center",
        header: 'Közvágóhíd -> Ráckeve',
        config: {
        stopId: 'BKK_009628',  // Közvágóhíd
        routeId: 'BKK_H6',
            }

what module is that for?
where do you want it (position:)
and I ‘guess’ all that should be inside the config: {} section

a module is

{   
    module:  name,
    position: xxxx,
    config: {
     ...
     ...  module specific config 
     ...
    }
}

please read the topics listed in my signature, they will help a lot… I didn’t write them

{
minutesAfter: 50,
hideStopTimesInNextMinutes: 0,
updateInterval: 60000, // 1 minute in milliseconds
showHead: true, // true | false
showSymbolInHead: true, // true | false
showSymbolInStopTime: false, // true | false
showRouteNameInStopTime: false, // true | false
maxNumberOfItems: 3,
align: ‘left’, // ‘left’ | ‘right’
fade: true,
fadePoint: 0.25,
coloredSymbolInHead: true, // true | false
coloredTextInHead: true, // true | false
coloredSymbolInStopTime: true, // true | false
coloredRouteNameInStopTime: true, // true | false
symbolColors: {
tram: ‘#ffcf42’, // yellow-ish
bus: ‘#1a9fed’, // blue-ish
subway: ‘#b3090c’, // red-ish
trolleybus: ‘#931517’, // dark red-ish
rail: ‘#5cbc82’, // green-ish
ferry: ‘#1a52ed’ // dark-blue-ish
},

your three modules work perfectly

the ‘problem’ is this config, as it has no ‘module’ or ‘position’ or ‘config’:{} section

/* MagicMirror² Config Sample
 *
 * By Michael Teeuw https://michaelteeuw.nl
 * MIT Licensed.
 *
 * For more information on how you can configure this file
 * see https://docs.magicmirror.builders/configuration/introduction.html
 * and https://docs.magicmirror.builders/modules/configuration.html
 */
let config = {
	address: "localhost", 	// Address to listen on, can be:
							// - "localhost", "127.0.0.1", "::1" to listen on loopback interface
							// - another specific IPv4/6 to listen on a specific interface
							// - "0.0.0.0", "::" to listen on any interface
							// Default, when address config is left out or empty, is "localhost"
	port: 8080,
	basePath: "/", 	// The URL path where MagicMirror² is hosted. If you are using a Reverse proxy
					// you must set the sub path here. basePath must end with a /
	ipWhitelist: ["127.0.0.1", "::ffff:127.0.0.1", "::1"], 	// Set [] to allow all IP addresses
															// or add a specific IPv4 of 192.168.1.5 :
															// ["127.0.0.1", "::ffff:127.0.0.1", "::1", "::ffff:192.168.1.5"],
															// or IPv4 range of 192.168.3.0 --> 192.168.3.15 use CIDR format :
															// ["127.0.0.1", "::ffff:127.0.0.1", "::1", "::ffff:192.168.3.0/28"],

	useHttps: false, 		// Support HTTPS or not, default "false" will use HTTP
	httpsPrivateKey: "", 	// HTTPS private key path, only require when useHttps is true
	httpsCertificate: "", 	// HTTPS Certificate path, only require when useHttps is true

	language: "hu",
	locale: "hu-HU",
	logLevel: ["INFO", "LOG", "WARN", "ERROR"], // Add "DEBUG" for even more logging
	timeFormat: 24,
	units: "metric",
	// serverOnly:  true/false/"local" ,
	// local for armv6l processors, default
	//   starts serveronly and then starts chrome browser
	// false, default for all NON-armv6l devices
	// true, force serveronly mode, because you want to.. no UI on this device

	modules: [
		{
			module: "alert",
		},
		{
			module: "updatenotification",
			position: "top_bar"
		},
		{
			module: "clock",
			position: "top_left"
		},
		{
			module: "calendar",
			header: "US Holidays",
			position: "top_left",
			config: {
				calendars: [
					{
						symbol: "calendar-check",
						url: "webcal://www.calendarlabs.com/ical-calendar/ics/76/US_Holidays.ics"
					}
				]
			}
		},
		{
			module: "compliments",
			position: "lower_third"
		},
		{
			module: "weather",
			position: "top_right",
			config: {
				weatherProvider: "openweathermap",
				type: "current",
				location: "Hungary",
				locationID: "3044475", //ID from http://bulk.openweathermap.org/sample/city.list.json.gz; unzip the gz file and find your city
				apiKey: "001ffggghjkd4958e701a4e2a8340bbc"
			}
		},
		{
			module: "weather",
			position: "top_right",
			header: "Weather Forecast",
			config: {
				weatherProvider: "openweathermap",
				type: "forecast",
				location: "Hungary",
				locationID: "3044475", //ID from http://bulk.openweathermap.org/sample/city.list.json.gz; unzip the gz file and find your city
				apiKey: "001ffggghjkd4958e701a4e2a8340bbc"
			}
		},
		{
			module: "newsfeed",
			position: "bottom_bar",
			config: {
				feeds: [
					{
						title: "HVG TECH TUDOMÁNY HÍREK",
						url: "http://hvg.hu/rss/tudomany"
					},
                    			{
						title: "BBC VILÁG HÍREK",
						url: "http://feeds.bbci.co.uk/news/world/rss.xml"
					},
                    			{
						title: "TELEX HÍREK",
						url: "https://www.index.hu/kulfold/rss"
					}
				],
				showSourceTitle: true,
				showPublishDate: true,
				broadcastNewsFeeds: true,
				broadcastNewsUpdates: true
			}
		},
        {
       module: "MMM-network-signal",
       position: "top_center",
       config: {
           // Configuration of the module goes here
       }
   },  
       {
        module: 'MMM-Futar',
        position: 'top_center',
        config: {
        stopId: 'BKK_044033',
        routeId: '',
        }
    },
        {
        module: 'MMM-Futar',
        position: 'top_center',
        header: 'Ráckeve -> Közvágóhíd',
        config: {
        stopId: 'BKK_007947',  // Ráckeve
        routeId: 'BKK_H6',
        }
        },
        {
        module: "MMM-Futar",
        position: "top_center",
        header: 'Közvágóhíd -> Ráckeve',
        config: {
        stopId: 'BKK_009628',  // Közvágóhíd
        routeId: 'BKK_H6',
            }
        },
        {
        minutesAfter: 50,
        hideStopTimesInNextMinutes: 0,
        updateInterval: 60000, // 1 minute in milliseconds
        showHead: true, // true | false
        showSymbolInHead: true, // true | false
        showSymbolInStopTime: false, // true | false
        showRouteNameInStopTime: false, // true | false
        maxNumberOfItems: 3,
        align: 'left', // 'left' | 'right'
        fade: true,
        fadePoint: 0.25,
        coloredSymbolInHead: true, // true | false
        coloredTextInHead: true, // true | false
        coloredSymbolInStopTime: true, // true | false
        coloredRouteNameInStopTime: true, // true | false
        symbolColors: {
          tram: '#ffcf42', // yellow-ish
          bus: '#1a9fed', // blue-ish
          subway: '#b3090c', // red-ish
          trolleybus: '#931517', // dark red-ish
          rail: '#5cbc82', // green-ish
          ferry: '#1a52ed' // dark-blue-ish
        },
        alerts: {
          showHeaderInStopTime: true, // true | false
          showSymbolInStopTime: true, // true | false
          color: '#ffcf42', // 'auto' or any CSS color
          language: 'hu' // 'en' or 'hu' supported only by the Futár API
        }
      }
   ]
};
      
	
/*************** DO NOT EDIT THE LINE BELOW ***************/
if (typeof module !== "undefined") {module.exports = config;}

please use the code mark wrapper

paste your text
select it all
hit the button above the editor that looks like </>

trailing quote mark

I did find the trailing quote mark was missing :)

when i first installed the module i did npm install in the module folder.
Should I do it again after modifying the config js?

I do not have this request module thingy i already done that, the mirror actually works fine evewn with the mmm-futar modul(just only one single item) as I want to add more 2 with the provided example just black screen

      stopId: 'BKK_009628', // Közvágóhíd
      routeId: 'BKK_H6,   <-----

but other than that your config works for me…

did you do npm install in the module folder?
did u add the request module as I noted before ?

[09.12.2022 15:57.24.612] [LOG] Initializing new module helper …
[09.12.2022 15:57.24.612] [LOG] Module helper loaded: MMM-Futar
[09.12.2022 15:57.24.625] [ERROR] WARNING! Could not load config file. Starting with default configuration. Error found: TypeError: Cannot read properties of undefined (reading ‘split’)

see https://forum.magicmirror.builders/topic/15778/fix-for-black-screen-in-2-16-and-later/1

The solution what he told is not working for me either.
Here is what he said - you need to add the modules into the config.js file like this way.

{
module: “MMM-Futar”,
position: “top_left”,
header: ‘Közvágóhíd -> Ráckeve’,
config: {
stopId: ‘BKK_009628’, // Közvágóhíd
routeId: 'BKK_H6,
}
},
{
module: “MMM-Futar”,
position: “top_left”,
header: ‘Ráckeve -> Közvágóhíd’,
config: {
stopId: ‘BKK_007947’, // Ráckeve
routeId: ‘BKK_H6’,
}
},
]
};

I tried this way and it gives me a blank screen
here is my config

https://pastebin.com/bwrTtisP

Anyone has any idea about this issue of mine?

just add the new output foldername to the end of the command

and inside the one file have to change it too

in new_foldername

rename all.old things to the new_foldername

edit the new_foldername.js

change the register() to use the new_foldername

and use new_foldername as the module name in config.js