application/json-patch+json

A JSON Patch: a list of operations to apply to a document, for PATCH.

Extensions
.json-patch
Header
Content-Type: application/json-patch+json
Registered
Yes, in the IANA media type registry.
References
IANA · RFC 6902

What servers send

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

ExtensionApache httpd 2.4.69nginx 1.31.6
.json-patch Not listed Not listed

Common application types

Every media type, in one table