Edit in JSFiddle

    var data = {
        "nodes":[
            {"id":"n1", "loaded":true, "style":{ "fillColor": "rgba(236,46,46,0.8)", "label":"Node1"}},
            {"id":"n2", "loaded":true, "style":{ "fillColor": "rgba(47,195,47,0.8)", "label":"Node2"}},
            {"id":"n3", "loaded":true, "style":{ "fillColor": "rgba(28,124,213,0.8)", "label":"Node3"}}
        ],
        "links":[
            {"id":"l1","from":"n1", "to":"n2", "style":{"fillColor":"rgba(236,46,46,1)", "toDecoration":"arrow"}},
            {"id":"l2","from":"n2", "to":"n3", "style":{"fillColor":"rgba(47,195,47,1)", "toDecoration":"arrow"}},
            {"id":"l3","from":"n3", "to":"n1", "style":{"fillColor":"rgba(28,124,213,1)", "toDecoration":"arrow"}}
        ]
    };

    var t = new NetChart({
        container: document.getElementById("demo"),
        area: { height: null },
        data: { preloaded: data }
    });

<script src="https://cdn.zoomcharts-cloud.com/1/latest/zoomcharts.js"></script>
<content>
<div id="demo"></div>

</content>
#demo {height:98vh}