MIME Content-Type Values

HTTP includes a header that specifies the file format of the response. This is just my list of ones that I keep having to lookup. See the Notes at the bottom of the page for links to the complete lists.

File format	Extension	MIME Content-Type
Comma-separated values	`.csv`	text/csv
ePub	`.epub`	application/epub+zip
Icon	`.ico`	image/vnd.microsoft.icon i
JavaScript	`.js`	text/javascript; charset=UTF-8 i
JSON	`.json`	application/json
PDF	`.pdf`	application/pdf
RSS	`.rss`	application/rss+xml i
SVG	`.svg`	image/svg+xml
Microsoft Excel	`.xlsx`	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
XML	`.xml`	text/xml
YAML	`.yaml`	text/yaml; charset=UTF-8 i
Zip	`.zip`	application/zip

Notes

The default for anything text is text/plain, usually with encoding text/plain; charset=UTF-8.

To force a file to be downloaded (vs displayed in the browser), use application/octet-stream.

Sources:

IANA media types - the official list
MDN: Common types - Mozilla's list of commonly used ones
MDN: Image file type and format guide - some of which conflict with the MDN common types list.
NGINX standard configuration
Apache standard configuration
FreeDesktop shared-mime-info data - used by GLib, Gnome and KDE (XML)
the file command (home page, source)

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