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{"hello":
    {
    "number":123,
    "somemsg":"message",

    "params":
        [
          {"key":"bye","value":"1"},
          {"key":"bey","value":"qwerty"}
        ]
    }
}

QJsonDocument doc = QJsonDocument::fromJson(json);
QJsonObject obj = doc.object();

QJsonObject obj = QJsonDocument::fromJson(json).object()["hello"].toObject();
qint8 error_code = obj["number"].toDouble();
QString error_msg = obj["somemsg"].toString();