Parse JSON Array with Qt - c++

Question

I'm trying to write a desktop client with Qt for an online dictionary site. I got stuck on something about JSON.
http://ac.tureng.co/?c=?&t=expensive
?(["expensive","expensive habits","expensive medical equipment","expensive question","expensive watch","expensive-looking","expensively","expensiveness"]);
I think the data which come from the above address is JSON array. json.org has the following description:
An array is an ordered collection of values. An array begins with [
(left bracket) and ends with ] (right bracket). Values are separated
by , (comma).*
Also a valid JSON according to the JSON Formatter if a string is written instead of the first question mark:
a([
"expensive",
"expensive habits",
"expensive medical equipment",
"expensive question",
"expensive watch",
"expensive-looking",
"expensively",
"expensiveness"
]);
But this change is not enough for the JSONLint site:
["expensive", "expensive habits", "expensive medical equipment", "expensive question", "expensive watch", "expensive-looking", "expensively", "expensiveness"]
I want to show suggestions to the user at the user input using the data from here. For now I can't extract JSON, so I've reached the desired behavior by acting it as plain text. Is there a way to do this properly by parsing JSON?
The codes I've written so far are:
QString turengOneriMetin = QString("http://ac.tureng.co/?c=?&t=%1").arg(arg1);
QUrl turengOneri(turengOneriMetin);
QNetworkAccessManager manager;
QNetworkReply *response = manager.get(QNetworkRequest(turengOneri));
QEventLoop event;
connect(response, SIGNAL(finished()), &event, SLOT(quit()));
event.exec();
QString content = response->readAll();
content.replace(0,1,"a");
content = content.replace("a([", "").replace("]);", "").replace("\"","");
QStringList wordList;
wordList << content.split(",");
ui->label->setText(content);
// https://stackoverflow.com/questions/24248606/how-to-accomplish-drop-down-word-suggestions-in-qt
QCompleter *completer = new QCompleter(wordList, this);
completer->setCaseSensitivity(Qt::CaseInsensitive);
ui->lineEdit->setCompleter(completer);
Update: After receiving the JSON correctly with help of answers and other resources I've done what I wanted with the following piece of code:
QJsonDocument document = QJsonDocument::fromJson(content.toUtf8());
QJsonArray documentArray = document.array();
QStringList wordList;
for (const QJsonValue &i : documentArray)
{
//qInfo() << i.toString() << endl;
wordList << i.toString();
}

Answer 1

I think that URL should be this - http://ac.tureng.co/?t=expensive
In this case you'll get valid JSON.