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What is Fedify?

Fedify is a TypeScript library for building federated server apps powered by ActivityPub and other standards, so-called fediverse.[1] It aims to eliminate the complexity and redundant boilerplate code when building a federated server app, so that you can focus on your business logic and user experience.

Currently, Fedify provides the following features out of the box:

  • Type-safe objects for Activity Vocabulary (including some vendor-specific extensions)
  • WebFinger client and server
  • HTTP Signatures
  • Middlewares for handling webhooks
  • NodeInfo protocol
  • Special touch for interoperability with Mastodon and few other popular fediverse software
  • CLI toolchain for testing and debugging

If you want to know more about the project, please take a look at the following resources:

If you have any questions, suggestions, or feedback, please feel free to join our Matrix chat space or GitHub Discussions.


  1. You may already know some of the networks in the fediverse, such as Mastodon, Lemmy, Pixelfed, PeerTube, and so on. ↩︎