The export/import functionality is, yes. This implementation uses the same API endpoints, but the main reason for this existing:

An instance I was on slowly died, starting with the frontend (default web UI). At least at the time, no client implemented the export/import functionality, so I wrote a simple script in Bash to download the user data, if the backend still works. Running a script can still be a challenge to some users, so I wrote a web application with the same functionality. It's a bit redundant if we're talking about regularly working instances, but can be of use if the frontend isn't available for some reason.

• "display_name" ​
• "bio" ​
• "avatar" ​
• "banner" ​
• "matrix_id" ​
• "bot_account" ​
• "settings" ​
• "followed_communities" ​
• "saved_posts" ​
• "saved_comments" ​
• "blocked_communities" ​
• "blocked_users" ​
• "blocked_instances"

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.

The whole point of this being a web app is to make it as easy as possible for the user to download/modify/transfer their user data. LASIM is a traditional app the user has to download and install, similar to a script this web app was developed to replace due to being too difficult to use for some users.

The import functionality targeted by this API is additive and my app features a built-in editor to add, modify or remove information as the user sees fit. To achieve your stated goal, you'd have to remove anything except the blocked_users entries before importing, which my app supports, I added a wiki entry explaining the workflow in more Detail.

I may add options to modify the exported data in some ways via a simple checkbox in the future, but I wouldn't count on it. I'm always open for pull requests!