QJsonObject obj; obj.insert("name", "John");
QJsonObject obj; obj.insert("id", 123); obj.insert("name", "John"); obj.insert("age", 30);
QJsonObject innerObj; innerObj.insert("key1", "value1"); innerObj.insert("key2", "value2"); QJsonObject obj; obj.insert("nested", innerObj);The QJsonObject class is part of the Qt Core library, which is included in the Qt toolkit.