sub unfoldauthors3 {
    my ($authors) = @_;
    return [ map { $_->{family}.', '.$_->{given}.'; '.join(' - ',
        map {$_->{name}} @{ $_->{affiliation} }) } @{$authors->[0]} ];
}
[download]

And I agree that my original unfoldauthors using JSON::Path is overkilling.

My original question should have been reworded as:

If I wanted to use JSON::Path instead of ripping the perl data directly could I have the same output in one extraction, in one loop ?

In the unfoldauthors above I have to use the JSON::Path object for the affiliation name for each author's name.

Is there a way using JSON::Path to have in the same time, the author's family, given, affiliation.name ?

I guess this is also not quite what you wanted...

my @all = JSON::Path->new( '$..author[*].[family,given,affiliation]' )
+->values( $data );
print Dumper \@all;

__END__
$VAR1 = [
          'Oubaha',
          'Brahim',
          [
            {
              'name' => 'Laboratory of Biology and Biotechnology of Mi
+croorganisms Faculty of Sciences Semlalia Cadi Ayyad University Marra
+kech Morocco'
            },
            {
              'name' => "Laboratory of Interaction Plant\x{2010}Microo
+rganisms, Department of Biology University of Fribourg Fribourg Switz
+erland"
            }
          ],
          'Nafis',
          'Ahmed',
          [
            {
              'name' => 'Laboratory of Biology and Biotechnology of Mi
+croorganisms Faculty of Sciences Semlalia Cadi Ayyad University Marra
+kech Morocco'
            }
          ],
          'Baz',
          'Mohamed',
          [
            {
              'name' => 'Laboratory of Biology and Biotechnology of Mi
+croorganisms Faculty of Sciences Semlalia Cadi Ayyad University Marra
+kech Morocco'
            }
          ],
          'Mauch',
          'Felix',
          [
            {
              'name' => "Laboratory of Interaction Plant\x{2010}Microo
+rganisms, Department of Biology University of Fribourg Fribourg Switz
+erland"
            }
          ],
          'Barakate',
          'Mustapha',
          [
            {
              'name' => 'Laboratory of Biology and Biotechnology of Mi
+croorganisms Faculty of Sciences Semlalia Cadi Ayyad University Marra
+kech Morocco'
            },
            {
              'name' => 'Agrobiosciences & Fertilizers Program Uni
+versity Mohammed IV Polytechnic (UM6P) Benguerir Morocco'
            }
          ]
        ];
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Nice !

my $cr = REST::Client::CrossRef->new(
    mailto        => 'd...h',
    spit_raw_data => 0,
    add_end_flag  => 1,
    json_path     => [ ['$..author[*].[family,given,affiliation]'], ],
    json_path_callback =>
        { '$..author[*].[family,given,affiliation]' => \&unfoldauthors
+4 },
);

sub unfoldauthors4 {
    my ($authors) = @_;
    my @all = @{$authors};
    print Dumper @all;
    my $authors_limit = 50;
    my $last          = $authors_limit - 1;
    my $size          = @all / 3;
    if ( $size > $authors_limit ) {
        @all = @all[ 0 .. $last * 3 ];
        $all[ $last * 3 - 1 ] .= " ...";
    }
    my @res;
    my $i;
    for ( $i = 0; $i <= $#all; $i += 3 ) {
        my $line =
              $all[$i] . ", "
            . $all[ $i + 1 ] . "; "
            . join( " ", map { $_->{name} } @{ $all[ $i + 2 ] } );
        push @res, $line;

    }
    return \@res;
}
[download]

works

Thanks

Update the above loop is not elegant and perlish; This is easier to read (without the truncation to 50 authors:

sub unfoldauthors4 {
    my ($authors) = @_;
    my @all = @{$authors};
    my @res;
    while (@all) {
     push @res, shift( @all) . ", ". shift( @all) . "; " .  join(" ", 
+map {$_->{name}} @{ shift( @all )});
    }
    return \@res;
}
[download]