Thanks. That's exactly the information I needed.

EDITED to add: the question below has been answered. Thanks so much.

Now I have another ignorant question. Below is my current working code. How do I get the size of the JSON object $json_string, and how do I loop over the first index?

 
use strict;
use warnings;
use Mojo::UserAgent;
use LWP::UserAgent;
use HTTP::Request::Common qw(GET);

# use JSON;
use Data::Dump qw(dd);

my $outputFilename = "test_output.txt";
my $fh_data;

my $urlkey_result;
my $timestamp_result;
my $original_result;
my $mimetype_result;
my $statuscode_result;
my $digest_result;
my $length_result;

open( $fh_data, '>', $outputFilename )
  or die "Could not open file '$outputFilename' $!";

my $url =
"http://web.archive.org/cdx/search/cdx?url=anautismobserver.wordpress.
+com&output=json";    # &limit=3
my $ua          = Mojo::UserAgent->new;
my $json_string = $ua->get($url)->res->json;

# dd $json_string;    # for debug

$urlkey_result     = $json_string->[0][0];
$timestamp_result  = $json_string->[0][1];
$original_result   = $json_string->[0][2];
$mimetype_result   = $json_string->[0][3];
$statuscode_result = $json_string->[0][4];
$digest_result     = $json_string->[0][5];
$length_result     = $json_string->[0][6];

print $fh_data "\n$urlkey_result\t$timestamp_result\t$original_result\
+t$mimetype_result\t$statuscode_result\t$digest_result\t$length_result
+";

$urlkey_result     = $json_string->[1][0];
$timestamp_result  = $json_string->[1][1];
$original_result   = $json_string->[1][2];
$mimetype_result   = $json_string->[1][3];
$statuscode_result = $json_string->[1][4];
$digest_result     = $json_string->[1][5];
$length_result     = $json_string->[1][6];

print $fh_data "\n$urlkey_result\t$timestamp_result\t$original_result\
+t$mimetype_result\t$statuscode_result\t$digest_result\t$length_result
+";

$urlkey_result     = $json_string->[2][0];
$timestamp_result  = $json_string->[2][1];
$original_result   = $json_string->[2][2];
$mimetype_result   = $json_string->[2][3];
$statuscode_result = $json_string->[2][4];
$digest_result     = $json_string->[2][5];
$length_result     = $json_string->[2][6];

print $fh_data "\n$urlkey_result\t$timestamp_result\t$original_result\
+t$mimetype_result\t$statuscode_result\t$digest_result\t$length_result
+";
$urlkey_result     = $json_string->[3][0];
$timestamp_result  = $json_string->[3][1];
$original_result   = $json_string->[3][2];
$mimetype_result   = $json_string->[3][3];
$statuscode_result = $json_string->[3][4];
$digest_result     = $json_string->[3][5];
$length_result     = $json_string->[3][6];

print $fh_data "\n$urlkey_result\t$timestamp_result\t$original_result\
+t$mimetype_result\t$statuscode_result\t$digest_result\t$length_result
+";
close $fh_data;
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.