Background knowledge about how JSON-LD works on the Fediverse and in ActivityPub, including the difference between @id and id, @type and type (keyword aliasing via @context), the many forms a value can take (string, object with @value, object with @id, array, language-tagged value), the four JSON-LD document forms (compacted, expanded, flattened, framed), how @context works and when it is optional
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Fediverse JSON-LD — Complete Reference
Overview
ActivityPub and ActivityStreams 2.0 use JSON-LD as their data format. JSON-LD (JSON for Linking Data) is a W3C standard that extends JSON with semantic meaning by mapping property names to IRIs via a @context.
In practice, most Fediverse implementations do not perform full JSON-LD processing. They treat ActivityPub messages as plain JSON, looking up properties by their short names and ignoring the @context. This mostly works but cre
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