What is the MIME type for Markdown?
Does anyone know if there exists a MIME type for Markdown? I guess it is text/plain, but is there a more specific one?
Answer
tl;dr: text/markdown since March 2016
In March 2016, text/markdown was registered as RFC7763 at IETF.
Previously, it should have been text/x-markdown. The text below describes the situation before March 2016, when RFC7763 was still a draft.
There is no official recommendation on Gruber’s definition, but the topic was discussed quite heavily on the official mailing-list, and reached the choice of text/x-markdown.
This conclusion was challenged later, has been confirmed and can be, IMO, considered consensus.
This is the only logical conclusion in the lack of an official mime type: text/ will provide proper default almost everywhere, x- because we're not using an official type, markdown and not gruber. or whatever because the type is now so common.
There are still unknowns regarding the different “flavors” of Markdown, though. I guess someone should register an official type, which is supposedly easy, but I doubt anyone dares do it beyond John Gruber, as he very recently proved his attachment to Markdown.
There is a draft on the IETF for text/markdown, but the contents do not seem to describe Markdown at all, so I wouldn't use it until it gets more complete.