var data = { "nodes":[ {"id":"n1", "loaded":true, "style":{"label":"Node1"}}, {"id":"n2", "loaded":true, "style":{"label":"Node2"}} ], "links":[ {"id":"l1","from":"n1", "to":"n2", "style":{"fillColor":"red", "toDecoration":"arrow"}}, {"id":"l11","from":"n1", "to":"n2", "style":{"fillColor":"red", "toDecoration":"arrow"}}, {"id":"l111","from":"n1", "to":"n2", "style":{"fillColor":"red", "toDecoration":"arrow"}}, {"id":"l114","from":"n1", "to":"n2", "style":{"fillColor":"red", "toDecoration":"arrow"}} ] }; var t = new NetChart({ container: document.getElementById("demo"), area: { height: 350 }, data: { preloaded: data }, info: {enabled: true, linkContentsFunction: function(data, link, callback) { return link.id; }} });