Important: An officially mentioned type either does not exist, or is hard to track down. The information here likely reflects community contributions or popular usage derived from existing implementations.
A Jupyter notebook: a JSON document holding an ordered list of cells containing code, prose and the output produced by running that code, plus metadata naming the kernel needed to execute it.
There is no registered media type for the format. application/x-ipynb+json is the unregistered name that Jupyter's own tooling and most editors settled on, so it is a community convention rather than a standard. If you know of an authoritative source that pins this down, the maintainers would welcome it.
File types
.ipynb
Also appears as
Not known to appear as any other types