diff --git a/index.html b/index.html
index f06ec842..feb07713 100644
--- a/index.html
+++ b/index.html
@@ -241,12 +241,6 @@ <h1>NetJSONGraph.js Example Demos</h1>
           >Multiple links render</a
         >
       </div>
-
-      <div class="cards">
-        <a href="./examples/netjsongraph-nodeExpand.html" target="_blank"
-          >Nodes expand or fold</a
-        >
-      </div>
     </main>
 
     <script>
diff --git a/public/assets/data/netjsongraph-foldNodes.json b/public/assets/data/netjsongraph-foldNodes.json
deleted file mode 100644
index b00d8fd3..00000000
--- a/public/assets/data/netjsongraph-foldNodes.json
+++ /dev/null
@@ -1,67 +0,0 @@
-{
-  "type": "NetworkGraph",
-  "label": "Ninux Roma",
-  "protocol": "OLSR",
-  "version": "0.6.6.2",
-  "metric": "ETX",
-  "nodes": [
-    {
-      "id": "172.0.0.1",
-      "category": 1,
-      "childNodes": [
-        {
-          "id": "172.0.0.2"
-        },
-        {
-          "id": "172.0.0.3"
-        },
-        {
-          "id": "172.0.0.4"
-        }
-      ]
-    },
-    {
-      "id": "172.0.1.1",
-      "category": 2,
-      "childNodes": [
-        {
-          "id": "172.0.1.2",
-          "childNodes": [
-            {
-              "id": "172.0.1.21"
-            },
-            {
-              "id": "172.0.1.22"
-            }
-          ]
-        },
-        {
-          "id": "172.0.1.3"
-        },
-        {
-          "id": "172.0.1.4",
-          "childNodes": [
-            {
-              "id": "172.0.1.41",
-              "childNodes": [
-                {
-                  "id": "172.0.1.411"
-                }
-              ]
-            },
-            {
-              "id": "172.0.1.42"
-            }
-          ]
-        }
-      ]
-    }
-  ],
-  "links": [
-    {
-      "source": "172.0.0.1",
-      "target": "172.0.1.1",
-      "cost": 1
-    }
-  ]
-}
diff --git a/public/example_templates/netjsongraph-nodeExpand.html b/public/example_templates/netjsongraph-nodeExpand.html
deleted file mode 100644
index c931908e..00000000
--- a/public/example_templates/netjsongraph-nodeExpand.html
+++ /dev/null
@@ -1,109 +0,0 @@
-<!doctype html>
-<html lang="en">
-  <head>
-    <title>netjsongraph.js: basic example</title>
-    <meta charset="utf-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <!-- theme can be easily customized via css -->
-    <link href="../lib/css/netjsongraph-theme.css" rel="stylesheet" />
-    <link href="../lib/css/netjsongraph.css" rel="stylesheet" />
-  </head>
-  <body>
-    <script type="text/javascript">
-      /*
-          The demo is used to show how to interact with elements.
-      */
-      // `graph` render defaultly.
-      const graph = new NetJSONGraph(
-        "../assets/data/netjsongraph-foldNodes.json",
-        {
-          dealDataByWorker: "../lib/js/netjsonWorker.js",
-          echartsOption: {
-            legend: {
-              left: 10,
-              bottom: 10,
-              orient: "vertical",
-              textStyle: {
-                color: "#6d6357",
-                fontFamily: "Arial, sans-serif",
-                fontSize: 14,
-              },
-              backgroundColor: "#fbfbfb",
-              borderWidth: 1,
-              borderRadius: 2,
-            },
-          },
-
-          // Convert to internal json format
-          prepareData: (data) => {
-            data.nodes.map((node) => {
-              node.properties = Object.assign(node.properties || {}, {
-                category: node.category,
-              });
-            });
-          },
-
-          onClickElement: function (type, data) {
-            let nodeLinkData;
-            if (type === "node") {
-              nodeLinkData = this.utils.nodeInfo(data);
-            } else {
-              nodeLinkData = this.utils.linkInfo(data);
-            }
-            this.gui.getNodeLinkInfo(type, nodeLinkData);
-            if (
-              this.config.showMetaOnNarrowScreens ||
-              this.el.clientWidth > 850
-            ) {
-              this.gui.metaInfoContainer.style.display = "flex";
-            }
-            clickElement.call(this, type, data);
-            this.gui.sideBar.classList.remove("hidden");
-          },
-        },
-      );
-
-      graph.render();
-
-      function clickElement(type, data) {
-        // expand or fold nodes
-        if (type === "node" && data.childNodes) {
-          let JSONData = this.data;
-
-          // Detect whether expanded.
-          if (!data._expanded) {
-            // Traverse child nodes, add them to the level with father.
-            data.childNodes.map((child) => {
-              // The `flatNodes` attribute is obtained after processed by `dealDataByWorker`.
-              JSONData.flatNodes[child.id] = child;
-              JSONData.nodes.push(child);
-              // Add links
-              JSONData.links.push({
-                source: data.id,
-                target: child.id,
-              });
-              child.category = data.category;
-            });
-
-            JSONData.flatNodes[data.id]._expanded = true;
-          } else {
-            // delete expanded nodes
-            data.childNodes.map((child) => {
-              let node = JSONData.flatNodes[child.id],
-                index = JSONData.nodes.indexOf(node);
-
-              JSONData.nodes.splice(index, 1);
-              Reflect.deleteProperty(JSONData.flatNodes, child.id);
-            });
-
-            JSONData.flatNodes[data.id]._expanded = false;
-          }
-
-          graph.echarts.setOption(
-            graph.utils.generateGraphOption(JSONData, graph),
-          );
-        }
-      }
-    </script>
-  </body>
-</html>
diff --git a/test/browser.test.utils.js b/test/browser.test.utils.js
index 14cbb504..8f46c3c4 100644
--- a/test/browser.test.utils.js
+++ b/test/browser.test.utils.js
@@ -2,7 +2,6 @@ import {Builder, By, until} from "selenium-webdriver";
 import chrome from "selenium-webdriver/chrome";
 import netJsonMap from "../public/assets/data/netjsonmap.json";
 import netJsonMultipleInterfaces from "../public/assets/data/netjson-multipleInterfaces.json";
-import netJsonGraphFoldNodes from "../public/assets/data/netjsongraph-foldNodes.json";
 import netJsonMapIndoorMap from "../public/assets/data/netjsonmap-indoormap.json";
 import netJsonElementsLegend from "../public/assets/data/netjson-elementsLegend.json";
 import netJsonGraphMultipleLinks from "../public/assets/data/netjsongraph-multipleLinks.json";
@@ -96,7 +95,6 @@ export const getPresentNodesAndLinksCount = async (example) => {
     "Data parse": netJsonMap,
     "Switch render mode": netJsonMap,
     "Switch graph mode": netJsonMap,
-    "Nodes expand or fold": netJsonGraphFoldNodes,
     "Indoor map": netJsonMapIndoorMap,
     "Leaflet plugins": netJsonMap,
     "Custom attributes": netJsonElementsLegend,
