Which can be shortened and made less repetitive like this:

use feature qw{ say };

if (is_hashref($decodedJSON) && exists $decodedJSON->{items}) {
    for my $item (@{ $decodedJSON->{items} }) {
        say $item->{name} if exists $item->{name};
        if (exists $item->{address} && is_hashref($item->{address})) {
            for my $key (
                qw( address_line_1 address_line_2 locality region post
+al_code )
            ) {
                say $item->{address}{$key} if exists $item->{address}{
+$key};
            }
        }
    }
}
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