Your code contains errors and won't even compile. :{ Here is a minimal example of what you're trying to do. Note that JS's true becomes a plain 1 in perlsprak.

use strict;
use warnings;
use JSON::XS;
use LWP::Simple "get";

my $url = "http://steamcommunity.com/market/listings/440/Name%20Tag/re
+nder/?count=2&start=2";
my $json = get $url;
my $data = decode_json $json;
print $data->{success}, "\n";
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