(With Violentmonkey or Tampermonkey)
A userscript for exporting a MangaDex list to a .xml file for import to anime list sites.
Navigate to your MDList, which can be accessed via the top right menu and press the button at the top that reads 'export list.' The export function will take some time to complete, as this script waits for 1 second in between each request for information from MangaDex.
Note that you can also quickly grab your user list as a JSON through this url. This userscript utilizes that and also grabs the IDs of the entries on various list sites so that the exported XML file can be imported directly to the list sites.
The generated XML file is of the MyAnimeList export format, containing extra elements for use with various manga tracking sites. These include:
manga_mangadb_id: MyAnimeList IDmanga_mangadex_id: MangaDex IDmanga_anilist_id: AniList IDmanga_kitsu_id: Kitsu IDmanga_mangaupdates_id: MangaUpdates IDmanga_animeplanet_slug: Anime-Planet slug
Do note that the IDs other than MAL's IDs aren't currently supported by any manga list tracking databases, but maybe they'll be supported by some in the future!