Hi @LuisAbreu! I cannot confirm this. Are you sure your json file is valid? The following works for me: ============================================ Json file: { "className": "ShoppingCart", "closedOn": "Fri Mar 27 15:52:13 2015", "coupon_count": "0", "createdOn": "Fri Mar 27 15:51:09 2015", "list": [ { "_className": "Product", "discount": "0", "fromyoubeep": "1", "has_alarm": 0, "id": "5601151333457", "intendedQuantity": 0, "isReady": "1", "isUnknown": "0", "loyaltyCredit": -1, "min_age": 0, "name": "Sumo Compal Cl<C3><A1>ssico Tutti-Fruti 1lt", "userCreated": "0", "weight": "0" }, { "_className": "Product", "fromyoubeep": "0", "has_alarm": 0, "id": "", "intendedQuantity": 0, "isReady": "1", "isUnknown": "0", "userCreated": "0", "weight": "0" } ], "loyaltyCard": { "_className": "LoyaltyCard", "barcode": "2446037038353", "barcodeType": "EAN13", "discount": "0", "fromyoubeep": "1", "has_alarm": 0, "id": "2446037038353", "intendedQuantity": 0, "isReady": "1", "isUnknown": "0", "loyaltyCredit": 0, "min_age": 0, "name": "Cart<C3><A3>o Poupa Mais", "price": "0", "product_id": "-1", "quantity": "0", "quantityValidated": "0", "state": "0", "type": 1, "userCreated": "0", "weight": "0" }, "mobile_checkout": "1" } ============================================ C++ code: QFile file("/home/pw/file.json"); if (!file.open(QIODevice::ReadOnly)) { qDebug() << "file error"; return; } const QByteArray ba = file.readAll(); file.close(); QJsonParseError err; QJsonDocument doc = QJsonDocument::fromJson(ba, &err); qDebug() << err.errorString(); qDebug() << err.offset; QJsonObject sett2 = doc.object(); qDebug() << sett2.isEmpty(); QJsonObject sett3 = sett2.value(QString("loyaltyCard")).toObject(); qDebug() << sett3.isEmpty(); QJsonValue sett4 = sett3.value(QString("barcode")); qDebug() << sett4.toString(); ============================================ Cheers!