Example of Using Captcha::reCAPTCHA::V2

app.pm

use Captcha::reCAPTCHA::V2;


any ['get', 'post'] => '/' => sub {
    my $rc = Captcha::reCAPTCHA::V2->new;
    my $widget = $rc->html('site_key', { theme => 'light' });    
    template 'index' => { recaptcha => $widget };
};

post '/contact' => sub {
    my $data = params;

    my $rc = Captcha::reCAPTCHA::V2->new;
    my $response  = param( 'g-recaptcha-response' );
    my $result    = $rc->verify('secret', $response);

    if( $result->{is_valid} ){
        if( $data->{email} =~ /^([a-zA-Z][\w\_\.]{1,})\@([a-zA-Z0-9.-]+)\.([a-zA-Z]{2,})$/ ){
            email {
                from    => $data->{email},
                to      => $contact_email,
                subject => 'New contact form message',
                body    => $data->{message},
            };
            status '200';
            return to_json({ msg => 'Email is sent' });
        } else {
            status '422';
            return to_json({ error => 'Email is invalid' });
        }
    } else {
        status '400';
        return to_json({ error => 'Human identification is invalid' });
    }

};

true;