Check if a key exists inside a json object

Question

amt: \"10.00\"
email: \"sam@gmail.com\"
merchant_id: \"sam\"
mobileNo: \"9874563210\"
orderID: \"123456\"
passkey: \"1234\"

The above is the JSON o

Answer 1

Type check also works :

if(typeof Obj.property == "undefined"){
    // Assign value to the property here
    Obj.property = someValue;
}