charaset parameter is not required for JSON MIME type

[SaekiTominaga]

What version of Hono are you using?

4.6.13

What runtime/platform is your app running on? (with version if possible)

Node.js 22

What steps can reproduce the bug?

When a static JSON file is displayed with serveStatic(), application/json; charset=utf-8 is returned.

What is the expected behavior?

The charset parameter is not required for the MIME type of a JSON.

The current JSON specification (RFC 8259) does not allow anything other than UTF-8 to begin with.

In IANA, application/json is “Optional parameters: n/a”.

• RFC 8259 – Section 11
• Media Types – application/json

Therefore, the MIME type should be only application/json.

What do you see instead?

No response

Additional information

I am ready to do PR !

[yusukebe]

Hi @SaekiTominaga

You are right. It does not need the charset.

I am ready to do PR !

Please!