Hong Minhee on ActivityPub

Hong Minhee on ActivityPub

From Software Sessions by Jeremy Jung

February 28, 2025 · 46 min

About this episode

Hong Minhee discusses the ActivityPub protocol and its implementation in applications like Mastodon and Misskey.

Hong Minhee is an open source developer and the creator of the Fedify ActivityPub server framework. We talk about how applications like Mastodon and Misskey communicate with one another using ActivityPub. This includes discussions on built-in activites, extending the specification in a backwards compatible way, difficulties implementing JSON-LD, the inbox model, and his experience implementing the specification. Hong Minhee: activitypub profile fedify hollo Specifications: ActivityPub W3C specification JSON Linked Data Resource Description Framework W3C Semantic Web Standards ActivityPub and WebFinger ActivityPub and HTTP Signatures ActivityPub implementations: Mastodon Misskey Akkoma Pleroma Pixelfed Lemmy Loops GoToSocial ActivityPub support in Ghost Threads has entered the Fediverse ActivityPub tools: ActivityPub Academy BrowserPub fedify CLI -- Transcript You can help correct transcripts on GitHub . What's ActivityPub? [00:00:00] Jeremy: Today, I'm talking to Hong Minhee. He is the developer of Fedify. A TypeScript library for building ActivityPub server applications. The first thing I think we should start with is defining ActivityPub. what is ActivityPub? [00:00:16] Hong…

People in this episode

Host: Jeremy

Guest: Hong Minhee

Topics covered

  • ActivityPub
  • open source
  • Mastodon
  • Misskey
  • JSON-LD

Keywords

  • Fedify
  • inbox model
  • backwards compatibility
  • specification implementation

Mentioned in this episode

Products: ActivityPub, Mastodon, Misskey, W3C, Ghost Threads, ActivityPub Academy, BrowserPub, Fedify, TypeScript, Pixelfed

Places: East Asia, Japan

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