QStringList

Okay got it

Thank you !

Im not sure but, would it be possible to insert your 'TYPE ' and 'property ' directly in the json obj itself ?

QJsonObject obj;
obj.insert("TYPE", "jason_type_1"); // type
obj.insert("prop1", jason_1_property_1); // property 1
obj.insert("prop1", jason_1_property_2); // property 2
obj.insert("array", QStringList() {"a", "b"});
QJsonDocument doc(obj).toJson(); // <- this is your JSON string

Edit : also look this http://doc.qt.io/qt-5/qtqml-javascript-dynamicobjectcreation.html

QJsonObject obj;
obj.insert("someKey", "someValue");
obj.insert("someOtherKey", 123);
obj.insert("array", QStringList() {"a", "b"});
QJsonDocument doc(obj).toJson(); // <- this is your JSON string

but

I want to create JSON object dynamically (with new ) and i want to give TYPE and other property.

for example
one jason message it's TYPE is "jason_type_1" and it has 2 property like "jason_1_property_1" and "jason_property_2".

second jason message it's TYPE is "jason_type_2" and it has 3 property like "jason_2_property_1" , "jason_2_property_2" and "jason_3_property_3".

so base on the TYPE "jason_type_1" or "jason_type_2" i can filter the message and
then i read property like
QString read_string = (jsonObj["body"].toObject()["jason_1_property_1"]).toString();

so can you please give example how i will create this in QT ?

QJsonObject obj;
obj.insert("someKey", "someValue");
obj.insert("someOtherKey", 123);
obj.insert("array", QStringList() {"a", "b"});
QJsonDocument doc(obj).toJson(); // <- this is your JSON string

To create multiple messages, just repeat the process... I don't see a problem here. But then again, as said, I don't understand what your question really is about.

so How i will create JSON messages and how i will add different property type in JSON ??