====== Extension (object) ======

**Extensions** represent any arbitrary object, whose content and semantics are defined by a third-party [[:extension]], and are one of the 5 types of pushable [[:object]].

<WRAP center round important 80%>
**Careful!** A stand-alone "extension object" (as described on this page) is not the same thing as an "extension property" on another object, such as a [[note]] or [[actor]]. Extension properties do not need to have any of the fields specified here, can be any JSON type (not just objects), and should not be accessible at their own URI.
</WRAP>


===== Schema =====

  * type: "extension"
  * self: uri(extension) required
  * extension: uri
  * [other fields as defined by the extension]


===== Example =====

(note that this is completely made up and is not meant to represent any real extension)

<code javascript>
{
    "type": "extension",
    "self": "https://social.example/presence/10",
    "extension": "https://example.org/extension/presence",
    "actor": "https://social.example/actor/10",
    "presence": "online",
    "timestamp": "2025-03-22T07:42:32+00:00",
    "message": "hi guys"
}
</code>