vixcpp
diff --git a/‎examples/json_simple/08_to_nlohmann_json.cpp‎
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+/**
+ *
+ *  @file 08_to_nlohmann_json.cpp
+ *  @author Gaspard Kirira
+ *
+ *  Copyright 2025, Gaspard Kirira.
+ *  All rights reserved.
+ *  https://github.com/vixcpp/vix
+ *
+ *  Use of this source code is governed by a MIT license
+ *  that can be found in the License file.
+ *
+ *  Vix.cpp
+ */
+
+#include <iostream>
+
+#include <vix/json/Simple.hpp>
+#include <vix/json/convert.hpp> // to_json(Simple) -> Json
+#include <vix/json/json.hpp>    // vix::json::Json
+
+namespace
+{
+  void example_basic_object()
+  {
+    using namespace vix::json;
+
+    kvs user = obj({
+        "name",
+        "Alice",
+        "age",
+        30,
+        "ok",
+        true,
+        "score",
+        12.5,
+        "skills",
+        array({"C++", "P2P", "Offline-first"}),
+    });
+
+    Json j = to_json(user);
+
+    std::cout << "\n[example_basic_object]\n";
+    std::cout << j.dump(2) << "\n";
+  }
+
+  void example_nested()
+  {
+    using namespace vix::json;
+
+    kvs root = obj({
+        "app",
+        "Vix.cpp",
+        "meta",
+        obj({
+            "country",
+            "UG",
+            "version",
+            "1.0.0",
+            "features",
+            array({"http", "ws", "p2p"}),
+        }),
+        "users",
+        array({
+            obj({"id", 1, "name", "Ada"}),
+            obj({"id", 2, "name", "Gaspard"}),
+        }),
+    });
+
+    token t = root; // token root holding object
+
+    Json j = to_json(t);
+
+    std::cout << "\n[example_nested]\n";
+    std::cout << j.dump(2) << "\n";
+  }
+
+  void example_roundtrip_style_usage()
+  {
+    using namespace vix::json;
+
+    kvs payload = obj({
+        "type",
+        "notification",
+        "data",
+        obj({
+            "title",
+            "Build OK",
+            "code",
+            200,
+            "tags",
+            array({"ci", "release", "vix"}),
+        }),
+    });
+
+    Json j = to_json(payload);
+
+    std::cout << "\n[example_roundtrip_style_usage]\n";
+    std::cout << "type=" << j.value("type", "missing") << "\n";
+    std::cout << j.dump(2) << "\n";
+  }
+
+} // namespace
+
+int main()
+{
+  example_basic_object();
+  example_nested();
+  example_roundtrip_style_usage();
+  return 0;
+}