So I wrote a little web app that allows a user to move their user data, like settings and subscribed/banned communities, from one account/instance to another.

It runs completely client-side, but is hosted on GitHub for the moment. Maybe it'll be of some use!

Features:

Don't trust me or GitHub? Clone the project and host it yourself or run it locally (Example in Wiki)
Export user data from any Lemmy instance (>=v0.19)
Download user data as a text file
Modify user data, e.g. to add or remove followed users/communites (Example in Wiki)
- "display_name"
- "bio"
- "avatar"
- "banner"
- "matrix_id"
- "bot_account"
- "settings"
- "followed_communities"
- "saved_posts"
- "saved_comments"
- "blocked_communities"
- "blocked_users"
- "blocked_instances"
Transfer user data to the target account on the target instance

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[–] Emotet@slrpnk.net 1 points 5 months ago

Sure, the code is completely client-side, simply clone it. If you're running into CORS problems due to the file:// scheme Origin of opening a local file, simply host it as a local temporary server with something like python -m http.server .

This is due to the two ways most instances validate Cross-Origin requests:

Sending Access-Control-Allow-Origin: * (allow all hosts)
Dynamically putting your Origin into the Origin header of the response to your requests by the backend

file:// URLs will result in a null or file:// Origin which can't be authorized via the second option, therefore the need to sometimes host the application via (local) webserver.