honkoma/docs/Differences-in-MastodonAPI-Responses.md

Differences in Mastodon API responses from vanilla Mastodon

A Pleroma instance can be identified by " (compatible; Pleroma )" present in version field in response from /api/v1/instance

Flake IDs

Pleroma uses 128-bit ids as opposed to Mastodon's 64 bits. However just like Mastodon's ids they are sortable strings

Attachment cap

Some apps operate under the assumption that no more than 4 attachments can be returned or uploaded. Pleroma however does not enforce any limits on attachment count neither when returning the status object nor when posting.