CPAN graph?

I don't have the JS chops to build one myself, but i can tell you where to easily get the data.

There's the ElasticSearch-based metacpan API which is documented here and here:
https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl.html
https://github.com/CPAN-API/cpan-api/blob/master/docs/API-docs.md

To get all the distributions on CPAN, you can build on this query:
http://api.metacpan.org/v0/distribution/_search

To get the dependencies for each distribution, you can build on this query:
http://api.metacpan.org/v0/search/reverse_dependencies/MetaCPAN-API

Note also that these URLs can easily be tested on the metacpan explorer:
https://explorer.metacpan.org/#/5706053

Total graph size should be around 32469 nodes.

The issue names no repository files, tests, or entry points. Start with the existing JavaScript visualization structure, then read the MetaCPAN API documentation and test the distribution and reverse-dependency queries in the MetaCPAN Explorer. Done means the project can represent the proposed CPAN dependency graph of roughly 32,469 nodes.

Written by the indexing model from the issue text.