You're not checking whether the response is an HTTP success...

my $req = POST(
    "http://myurl/public_html/cgi-bin/json-addition.cgi",
    Content_Type => 'application/json',
    Content      => $json->encode($data),
);

my $response = $ua->request($req);
$response->is_success or die($response->status_line);

my $result = $json->decode($response->decoded_content);
print $result->{c}, "\n";

[download]
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re: json return value by tobyink
in thread json return value by stenasc

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