As Parse.com is being phased out, there is increased interest in migrating to Appery's services.
Parse has provided the ability to migrate data to a MongoDB URL, but it seems Appery does/would not support this. The exported JSON and CSV files are not 1:1 compatible from Parse to Appery. Pointers, booleans, dates, and ACL information are also not 1:1, as well as a few other differences.
Anyway, I have searched for suggestions with no luck. I hope that there is a more simple way of migrating the data, than what I have in mind. This involves setting up a local connection to pull from the Parse data collections, mangling the data, and pushing back to Appery through the Appery REST calls. Any related files hosted on Parse will need to be downloaded manually, and uploaded to either Appery or another file host, then re-associated as needed. With this method, there is plenty of room for error.
If there is a better way, or a planned addition of a migration tool, I'd be interested in more information.