diff --git a/tests/nexus/platform/nexus_core.cpp b/tests/nexus/platform/nexus_core.cpp
index 71f7450cb..5bdc8b5fa 100644
--- a/tests/nexus/platform/nexus_core.cpp
+++ b/tests/nexus/platform/nexus_core.cpp
@@ -29,6 +29,7 @@
 #include "nexus_core.hpp"
 
 #include <cstdlib>
+#include <cstring>
 
 #include "nexus_node.hpp"
 
@@ -59,6 +60,153 @@ Core::Core(void)
     }
 }
 
+void Core::SaveTestInfo(const char *aFilename)
+{
+    FILE       *file = fopen(aFilename, "w");
+    Node       *tail = mNodes.GetTail();
+    const char *testcase;
+    const char *slash;
+    const char *dot;
+    const char *version;
+    int         testcaseLen;
+
+    VerifyOrExit(file != nullptr);
+
+    testcase = aFilename;
+    slash    = strrchr(aFilename, '/');
+
+    if (slash != nullptr)
+    {
+        testcase = slash + 1;
+    }
+
+    dot         = strrchr(testcase, '.');
+    testcaseLen = (dot != nullptr) ? static_cast<int>(dot - testcase) : static_cast<int>(strlen(testcase));
+
+    switch (otThreadGetVersion())
+    {
+    case OT_THREAD_VERSION_1_1:
+        version = "1.1";
+        break;
+    case OT_THREAD_VERSION_1_2:
+        version = "1.2";
+        break;
+    case OT_THREAD_VERSION_1_3:
+        version = "1.3";
+        break;
+    case OT_THREAD_VERSION_1_4:
+        version = "1.4";
+        break;
+    default:
+        version = "unknown";
+        break;
+    }
+
+    fprintf(file, "{\n");
+    fprintf(file, "  \"testcase\": \"%.*s\",\n", testcaseLen, testcase);
+    fprintf(file, "  \"pcap\": \"%s\",\n", getenv("OT_NEXUS_PCAP_FILE") ? getenv("OT_NEXUS_PCAP_FILE") : "");
+
+    if (!mNodes.IsEmpty())
+    {
+        NetworkKey                          networkKey;
+        Node                               &node = *mNodes.GetHead();
+        String<OT_NETWORK_KEY_SIZE * 2 + 1> keyString;
+
+        node.Get<KeyManager>().GetNetworkKey(networkKey);
+        keyString.AppendHexBytes(networkKey.m8, OT_NETWORK_KEY_SIZE);
+        fprintf(file, "  \"network_key\": \"%s\",\n", keyString.AsCString());
+
+        for (Node &leaderNode : mNodes)
+        {
+            if (leaderNode.Get<Mle::Mle>().IsLeader())
+            {
+                Ip6::Address aloc;
+                leaderNode.Get<Mle::Mle>().GetLeaderAloc(aloc);
+                fprintf(file, "  \"leader_aloc\": \"%s\",\n", aloc.ToString().AsCString());
+                break;
+            }
+        }
+    }
+
+    fprintf(file, "  \"topology\": {\n");
+    for (Node &node : mNodes)
+    {
+        fprintf(file, "    \"%u\": {\"name\": \"%s\", \"version\": \"%s\"}%s\n", node.GetInstance().GetId(),
+                node.GetName() ? node.GetName() : "", version, (&node == tail) ? "" : ",");
+    }
+    fprintf(file, "  },\n");
+
+    fprintf(file, "  \"extaddrs\": {\n");
+    for (Node &node : mNodes)
+    {
+        fprintf(file, "    \"%u\": \"%s\"%s\n", node.GetInstance().GetId(),
+                node.Get<Mac::Mac>().GetExtAddress().ToString().AsCString(), (&node == tail) ? "" : ",");
+    }
+    fprintf(file, "  },\n");
+
+    fprintf(file, "  \"rloc16s\": {\n");
+    for (Node &node : mNodes)
+    {
+        fprintf(file, "    \"%u\": \"0x%04x\"%s\n", node.GetInstance().GetId(), node.Get<Mle::Mle>().GetRloc16(),
+                (&node == tail) ? "" : ",");
+    }
+    fprintf(file, "  },\n");
+
+    fprintf(file, "  \"mleids\": {\n");
+    for (Node &node : mNodes)
+    {
+        fprintf(file, "    \"%u\": \"%s\"%s\n", node.GetInstance().GetId(),
+                node.Get<Mle::Mle>().GetMeshLocalEid().ToString().AsCString(), (&node == tail) ? "" : ",");
+    }
+    fprintf(file, "  },\n");
+
+    fprintf(file, "  \"rlocs\": {\n");
+    for (Node &node : mNodes)
+    {
+        fprintf(file, "    \"%u\": \"%s\"%s\n", node.GetInstance().GetId(),
+                node.Get<Mle::Mle>().GetMeshLocalRloc().ToString().AsCString(), (&node == tail) ? "" : ",");
+    }
+    fprintf(file, "  },\n");
+
+    fprintf(file, "  \"ipaddrs\": {\n");
+    for (Node &node : mNodes)
+    {
+        bool first = true;
+
+        fprintf(file, "    \"%u\": [\n", node.GetInstance().GetId());
+        for (const Ip6::Netif::UnicastAddress &addr : node.Get<ThreadNetif>().GetUnicastAddresses())
+        {
+            if (!first)
+            {
+                fprintf(file, ",\n");
+            }
+            fprintf(file, "      \"%s\"", addr.GetAddress().ToString().AsCString());
+            first = false;
+        }
+        fprintf(file, "\n    ]%s\n", (&node == tail) ? "" : ",");
+    }
+    fprintf(file, "  },\n");
+
+    fprintf(file, "  \"extra_vars\": {\n");
+    if (!mNodes.IsEmpty())
+    {
+        Node       &node = *mNodes.GetHead();
+        Ip6::Prefix prefix;
+
+        prefix.Set(node.Get<Mle::Mle>().GetMeshLocalPrefix());
+        fprintf(file, "    \"mesh_local_prefix\": \"%s\"\n", prefix.ToString().AsCString());
+    }
+    fprintf(file, "  }\n");
+
+    fprintf(file, "}\n");
+
+exit:
+    if (file != nullptr)
+    {
+        fclose(file);
+    }
+}
+
 Core::~Core(void) { sInUse = false; }
 
 Node &Core::CreateNode(void)
diff --git a/tests/nexus/platform/nexus_core.hpp b/tests/nexus/platform/nexus_core.hpp
index 11ed2c36a..4aad4a0cb 100644
--- a/tests/nexus/platform/nexus_core.hpp
+++ b/tests/nexus/platform/nexus_core.hpp
@@ -56,6 +56,8 @@ public:
     TimeMilli GetNow(void) { return mNow; }
     void      AdvanceTime(uint32_t aDuration);
 
+    void SaveTestInfo(const char *aFilename);
+
     //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     // Used by platform implementation
 
diff --git a/tests/nexus/platform/nexus_node.hpp b/tests/nexus/platform/nexus_node.hpp
index ca254635c..6cdec99d1 100644
--- a/tests/nexus/platform/nexus_node.hpp
+++ b/tests/nexus/platform/nexus_node.hpp
@@ -83,6 +83,9 @@ public:
     void GetTrelSockAddr(Ip6::SockAddr &aSockAddr) const;
 #endif
 
+    void        SetName(const char *aName) { IgnoreError(StringCopy(mName, aName)); }
+    const char *GetName(void) const { return mName; }
+
     //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
     template <typename Type> Type &Get(void)
@@ -113,7 +116,9 @@ public:
     Node *mNext;
 
 private:
-    Node(void) = default;
+    Node(void) {}
+
+    char mName[32];
 };
 
 inline Node &AsNode(otInstance *aInstance) { return Node::From(aInstance); }
diff --git a/tests/nexus/test_5_1_1.cpp b/tests/nexus/test_5_1_1.cpp
index 8a60bdec1..c7c4d5be4 100644
--- a/tests/nexus/test_5_1_1.cpp
+++ b/tests/nexus/test_5_1_1.cpp
@@ -106,6 +106,9 @@ void Test5_1_1(void)
     Node &leader = nexus.CreateNode();
     Node &router = nexus.CreateNode();
 
+    leader.SetName("LEADER");
+    router.SetName("ROUTER");
+
     nexus.AdvanceTime(0);
 
     Instance::SetLogLevel(kLogLevelInfo);
@@ -194,6 +197,8 @@ void Test5_1_1(void)
         router.Get<Mle::Mle>().GetLinkLocalAddress().ToString().AsCString());
     SendAndVerifyEchoRequest(nexus, leader, router, leaderReceivedEchoReply);
     Log("Router (as DUT) responded with Echo Reply successfully");
+
+    nexus.SaveTestInfo("test_5_1_1.json");
 }
 
 } // namespace Nexus