Get user input

[veryaner]

Hi, I’m still pretty new in this node.js topic, but I’m really interesting in adding some modules.
I’m struggling to get user input base on a button in the front-end (not physical button) but I cannot find the solution.
I tried with:

// create the server
	listen: function() {
		this.expressApp.get('/Button1', function (req, res) {
			sendSocketNotification('BUTTON1', 'Hello world');
			//res.send('Stop signal sent!');
		});
	},

But I got a:
ReferenceError: sendSocketNotification is not defined
or with this.sendSocketNotification I got:
TypeError: this.sendSocketNotification is not a function

Is there any way to get the user input?

Thanks!

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[strawberry 3.141]

@veryaner if you want you can have a look in my Module, i did a similar approach, this might get you started.

[veryaner]

Great it worked!!! My mistake was that I was creating the app after a notification and not at the start of my module!
Thanks a lot!