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HTML

              
                <script src="https://gojs.net/latest/release/go.js"></script>
<body>
  <div id="sample">
    <h1>Minimal <b>GoJS</b> Sample</h1>
    <!-- The DIV for the Diagram needs an explicit size or else we won't see anything. Also add a border to help see the edges. -->
    <div id="myDiagramDiv"></div>
  </div>
</body>
              
            
!

CSS

              
                #myDiagramDiv {
  border: solid 1px black;
  width:400px;
  height:400px;
}
              
            
!

JS

              
                var diagram = new go.Diagram("myDiagramDiv");
// For conciseness. See the "Building Parts" intro page for more
var $ = go.GraphObject.make;

// the node template describes how each Node should be constructed
diagram.nodeTemplate =
  $(go.Node, "Auto",  // the Shape automatically fits around the TextBlock
    $(go.Shape, "RoundedRectangle",
      // bind Shape.fill to Node.data.color
      new go.Binding("fill", "color")),
    $(go.TextBlock,
      { margin: 3 },  // some room around the text
      // bind TextBlock.text to Node.data.key
      new go.Binding("text", "key", (key, graphObject) => {
      return String(graphObject.panel.part.findLinksConnected().count)
}))
   );

// the Model holds only the essential information describing the diagram
diagram.model = new go.GraphLinksModel(
  [ // a JavaScript Array of JavaScript objects, one per node
    { key: "Alpha", color: "lightblue" },
    { key: "Beta", color: "orange" },
    { key: "Gamma", color: "lightgreen" },
    { key: "Delta", color: "pink" }
  ],
  [ // a JavaScript Array of JavaScript objects, one per link
    { from: "Alpha", to: "Beta" },
    { from: "Alpha", to: "Gamma" },
    { from: "Beta", to: "Beta" },
    { from: "Gamma", to: "Delta" },
    { from: "Delta", to: "Alpha" }
  ]);

diagram.initialContentAlignment = go.Spot.Center;
// enable Ctrl-Z to undo and Ctrl-Y to redo
diagram.undoManager.isEnabled = true;
              
            
!
999px

Console