#!/usr/bin/perl

use strict;
use warnings;

use Mojo::UserAgent;

# your URL

my $url =
'https://public-api.wordpress.com/rest/v1/read/feed/http%3A%2F%2Fthe-art-of-autism.com%2Ffeed';

# create a Mojo:UserAgent

my $ua = Mojo::UserAgent->new;

# use $ua to get the url and assign the value of 'subscriber_count' in the json
# to avariable, $subscribers

my $subscribers = $ua->get( $url )->result->json->{subscribers_count};

# print the variable to screen

print "Number of subscribers: $subscribers\n";

##</code><code>##

Number of subscribers: 181

##</code><code>##

cpanm Mojolicious

(or if you don't have cpanm)

cpan Mojolicious