(1)
my $incomingdata = [{name => 'abc1',quantity => 1},{name => 'abc2',quantity => 2}];
my @partofcookie = @$incomingdata;

(2)
my $incomingdata = "[{name => 'abc1',quantity => 1},{name => 'abc2',quantity => 2}]";
my @partofcookie = @$incomingdata;  # doesn't work!