JSON Value not set to textbox in JQUERY

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Javascript

PHP

MySQL

jQuery

i have a code in php which returns me JSON of a single row.

public function getEmploymentDetailsForEdit($id){
		$query="select * from js_employment_details where email_id='".$_SESSION['username']."'";
		$res=mysql_query($query);
		$row=mysql_fetch_array($res);
		echo json_encode($row);
	}

the function is called from below jquery function

function editEmploymentDetails(id){
		$.ajax({
			type:"POST",
			url:'getEmploymentDetailsForEdit.php',
			data:{id:id},
			success:function(response){
				console.log(response);
				$("#expDesignation").val(response[0]['designation']);
				$("#txtOrganization").val(response["organization"]);
				//$("").val(response["designation"]);
				$("#startDate").val(response["starts_date"]);
				$("#endDate").val(response["ends_date"]);
				$("#txtJobProfile").val(response["job_profile"]);
				$("#btnEmployment").val("Update");
			}
		});
	}

when the function enters success the response is coming proper but it the value is not set to the textbox.