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var leg = {
aa: "Hello from javascript"
...
function to_json() {
   return JSON.stringify(leg);
}

use strict;
use warnings;
...
#my ($val, $type) = $js->eval_in_page('JSON.stringify(window.leg);');
my ($val, $type) = $js->eval_in_page('to_json()');
print "val: $val, type: $type\n";

use strict;
use warnings;
...
#my ($val, $type) = $js->eval_in_page('JSON.stringify(window.leg);');
my ($val, $type) = $js->eval_in_page('to_json()');
print "val: $val, type: $type\n";