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A web app to easily transfer your user data from one Lemmy instance to another
(stablenarwhal.github.io)
Support / questions about Lemmy.
The code is completely written in JavaScript, so all the code is readable if you look at the source, which is also available on the GitHub page. https://stablenarwhal.github.io/LemmyInstanceMover/js/script.js
It looks like it uses a Lemmy API endpoint to transfer account settings.