Invalid MIME type in the README

[mindplay-dk]

mime-types/README.md

Line 82 in 7c3c63d

mime.contentType('file.json') // 'application/json; charset=utf-8'

The charset attribute does not exist for application/json - JSON is Unicode by definition, it's the only valid charset.

Is that what the function actually returns, or just a documentation issue?

[Errr0rr404]

I checked current behavior after installing mime-types from main:

mime.charset('application/json')           // 'UTF-8'
mime.contentType('file.json')              // 'application/json; charset=utf-8'
mime.contentType('application/json')       // 'application/json; charset=utf-8'

So the README examples match what the library actually returns. The charset comes from mime-db (JSON is registered with a default charset there).

You're right that RFC 8259 does not define a charset parameter for application/json (JSON is always Unicode). Whether to stop advertising a charset is probably a mime-db policy decision more than a mime-types docs bug.

Options if maintainers want a change:

1. Leave as-is (document real behavior; many stacks still send charset=utf-8 in practice)
2. Change the README example to a type where charset is unambiguously part of the type (e.g. text/html) and add a short note that charset defaults come from mime-db
3. Upstream a mime-db change for application/json (broader impact)

Happy to open a small docs PR for option 2 if that would help.

[Errr0rr404]

Follow-up: opened #210 clarifying the README examples and noting mime-db as the charset source.