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

There's several ways to do it, depending on your intent.

thisSession.hasOwnProperty('merchant_id'); will tell you if thisSession has that key itself (i.e. not something it inherits from elsewhere)

"merchant_id" in thisSession will tell you if thisSession has the key at all, regardless of where it got it.

thisSession["merchant_id"] will return false if the key does not exist, or if its value evaluates to false for any reason (e.g. if it's a literal false or the integer 0 and so on).