I have no cobbled together my own solution. It's less ugly than I expected.

Most tricky part (for me) was to come up with a regexp that works well enough for me. (I don't correctly deal with hashes inside arrays) 

our $store;

$ua->add_handler( response_data => sub {
                my($response, $ua, $h, $data) = @_;
                $store.=$data;

                eval {  
                        if ($store =~ s/^\s*({\s*(?:"[^"]*"|(?>[^"{}]*
+)|(?1))+\s*})\s*//){
                                my $result = $json->decode( $1 );
                                print Dumper $result;

                        };
                };
                if ($@){ print STDERR "Error: $@\n"; die };
                1;
        } );

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In reply to Re: Parsing JSON out of an incremental stream by Sec
in thread Parsing JSON out of an incremental stream by Sec

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