Developer Documentation for ActivityPub & Fediverse

Documentation

New to ActivityPub? Start here with our beginner-friendly guides covering core concepts, your first server, and understanding federation.

Deep-dive into ActivityPub, ActivityStreams 2.0, WebFinger, HTTP Signatures, and other protocols powering the Fediverse.

Step-by-step tutorials for building actors, handling activities, implementing follows, posts, likes, and more.

Complete reference for object types, activity types, properties, endpoints, and security implementations.

Explore server software, libraries, SDKs, client apps, bridges, and tools across the Fediverse ecosystem.

Interactive validators, inspectors, and testing tools to help you build and debug your ActivityPub implementation.

Build software compatible with 13+ million users across these platforms

ActivityPub is a W3C Recommendation — the open standard powering the decentralized social web.