I am looking to find the follower count of a Scratch user using the Scratch API. I already know how to get their message count, with https://api.scratch.mit.edu/users/[USER]/messages/count/
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As mentioned by _nix on this forum thread, there is currently no API to achieve this. However, he/she rightly points out that the number can be obtained from a user's profile page.
You may write a script (in JavaScript, for example) to parse the HTML and get the follower count in the brackets at the top of the page.
Hope this helps!