Network diagram GoJS

NETWORK DIAGRAM

Diagram Model saved in JSON format

{
        "class": "go.GraphLinksModel",
        "nodeDataArray": [
          { "key": 0, "type": "Cloud", "loc": "0 0", "text": "Internet" },
          { "key": 1, "type": "Firewall", "loc": "100 0" },
          { "key": 2, "type": "Router", "loc": "200 0" },
          { "key": 3, "type": "Server", "loc": "300 0" },
          { "key": 4, "type": "Switch", "loc": "200 100" },
          { "key": 5, "type": "Firewall", "loc": "25 100" },
          { "key": 6, "type": "Router", "loc": "25 200" },
          { "key": 7, "type": "Switch", "loc": "400 100" },
      
          { "key": 10, "isGroup": true, "text": "Intranet 1" },
          { "key": 11, "type": "PC", "loc": "150 220", "group": 10 },
          { "key": 12, "type": "PC", "loc": "250 220", "group": 10 },
          { "key": 13, "type": "PC", "loc": "150 270", "group": 10 },
          { "key": 14, "type": "PC", "loc": "250 270", "group": 10 },
      
          { "key": 20, "isGroup": true, "text": "Intranet 2" },
          { "key": 21, "type": "PC", "loc": "350 220", "group": 20 },
          { "key": 22, "type": "PC", "loc": "450 220", "group": 20 },
          { "key": 23, "type": "PC", "loc": "350 270", "group": 20 },
          { "key": 24, "type": "PC", "loc": "450 270", "group": 20 },
      
          { "key": 30, "isGroup": true, "text": "Isolation test" },
          { "key": 31, "type": "PC", "loc": "-100 172", "group": 30 },
          { "key": 32, "type": "PC", "loc": "-100 242", "group": 30 }
        ],
        "linkDataArray": [
          { "from": 0, "to": 1 },
          { "from": 1, "to": 2 },
          { "from": 2, "to": 3 },
          { "from": 2, "to": 4 },
          { "from": 5, "to": 4 },
          { "from": 5, "to": 6 },
          { "from": 4, "to": 7 },
          { "from": 4, "to": 10 },
          { "from": 7, "to": 20 },
          { "from": 6, "to": 30 }
        ]
      }