in reply to understanding json in perl
JSON is, of course, merely a data-format. In much younger and more innocent days, it was favored because it basically is JavaScript, and sites could (and did!) merely exec it. Today, you use a CPAN module such as JSON (as previously shown) both to encode and to decode the data. (Safely.) What you get is a Perl data structure, namely a hash.
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Seekers of Perl Wisdom