How to parse json string in Creator application?

In many case, zoho.crm functions just return json string, such as:

1, zoho.crm.searchRecordsByPDC

2, saleItems in following code,

saleOrders = zoho.crm.getRecords("SalesOrders");

for each saleOrder in saleOrders

{

saleItems = saleOrder.get("product");

}

How to parse json string in Creator?