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application/json

JSON text. Always UTF-8, so it takes no charset parameter.

Extensions: .json
Header: Content-Type: application/json
Registered: Yes, in the IANA media type registry.
References: IANA · RFC 8259 · Apache · nginx · MDN

What servers send

The type each server's own mime.types gives these extensions, as it ships.

Extension	Apache httpd 2.4.69	nginx 1.31.6
.json	application/json	application/json

The IANA registry also gives this extension to 74 other types.

Common application types

Every media type, in one table