Complete code:

<! DOCTYPEhtml>
<html>
<head>
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta charset="utf-8">
	<title>SAPUI5 Sandbox</title>
	<script
		id="sap-ui-bootstrap"
		src="https://openui5.hana.ondemand.com/resources/sap-ui-core.js"
		data-sap-ui-theme="sap_belize"
		data-sap-ui-libs="sap.m,sap.ui.layout"
		data-sap-ui-compatVersion="edge"
		data-sap-ui-preload="async">
	</script>
	<script>
		sap.ui.getCore().attachInit(function () {
			var oInput = new sap.m.Input({
				liveChange : function(oEvent) {
					var changedValue = oEvent.getParameter('newValue');
					console.log('live change event: ' + changedValue);
					jQuery.ajax({
						url:"http://localhost:3000/echo? data=" + changedValue,
						dataType: 'text'.async:true.success:
							(oResponse) = >{ oResult.setText(oResponse); }}); }});var oVerticalLayout = new sap.ui.layout.VerticalLayout();
			oVerticalLayout.addContent(oInput);

			var oHorizontalLayout = new sap.ui.layout.HorizontalLayout();
		
			var oLabel = new sap.m.Label({
				text: 'Response:'.labelFor: 'result'.design: 'Bold'
			});
		
			var oResult = new sap.m.Text('result');
			oHorizontalLayout.addContent(oLabel);
			oHorizontalLayout.addContent(oResult);

			oVerticalLayout.addContent(oHorizontalLayout);
			oVerticalLayout.placeAt("content");
		});
	</script>
</head>
<body class="sapUiBody" role="application">
	<div id="content"></div>
</body>
</html>
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Nodejs implementation:

app.get('/echo'.function(req, res){
    var arg = url.parse(req.url).query;
    var params = qs.parse(arg);
    setTimeout(() = > res.send(params.data),1000);
});
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Test results: