<![CDATA[QJsonDocument::toJson with subobjects]]>Hi,

I'm trying to output json data by using QJsonDocument and QJsonObject, but I have a problem with subobjects. The output always contains null for subojects. Below a small example:

QVariantHash sub;
sub.insert("id", 2);
sub.insert("name", "world");

QVariantHash root;
root.insert("id", 1);
root.insert("name", "hello");
root.insert("sub", QJsonObject::fromVariantHash(sub));

QString output = QJsonDocument(QJsonObject::fromVariantHash(root)).toJson(QJsonDocument::Compact);

Output = {"id":1,"name":"hello","sub":null}

What I am missing?
Best regards,
Jonathan

]]>https://forum.qt.io/topic/63466/qjsondocument-tojson-with-subobjectsRSS for NodeFri, 17 Apr 2026 15:42:45 GMTThu, 28 Jan 2016 14:50:53 GMT60<![CDATA[Reply to QJsonDocument::toJson with subobjects on Thu, 28 Jan 2016 15:09:06 GMT]]>Hi,

you try to add a QJsonObject to root.
If you try to add the QVariantHash to root you will get a valid json

QVariantHash sub;
sub.insert("id", 2);
sub.insert("name", "world");

QVariantHash root;
root.insert("id", 1);
root.insert("name", "hello");
root.insert("sub", sub);

QString output = QJsonDocument(QJsonObject::fromVariantHash(root)).toJson(QJsonDocument::Compact);

qDebug() << output; // prints "{\"id\":1,\"name\":\"hello\",\"sub\":{\"id\":2,\"name\":\"world\"}}"
]]>https://forum.qt.io/post/310112https://forum.qt.io/post/310112Thu, 28 Jan 2016 15:09:06 GMT