Check if a key exists inside a JSON object

by

Try this,

if(thisSession.hasOwnProperty('merchant_id')){

}

the JS Object thisSession should be like 

{
amt: "10.00",
email: "[email protected]",
merchant_id: "sam",
mobileNo: "9874563210",
orderID: "123456",
passkey: "1234"
}

you can find the details here

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