We'd like to introduce the #Fedify project family—a set of related tools that make building #ActivityPub applications more accessible:

Fedify

Fedify (@fedify) is a #TypeScript library for building federated server applications powered by ActivityPub and other #fediverse standards. It provides type-safe objects for Activity Vocabulary, WebFinger client/server, HTTP Signatures, and more—eliminating boilerplate code so you can focus on your application logic.

Hollo

Hollo (@hollo) is a single-user microblogging server powered by Fedify. While designed for individual users, it's fully federated through ActivityPub, allowing interaction with users across the fediverse. #Hollo implements Mastodon-compatible APIs, making it compatible with most Mastodon clients without needing its own web interface.

Hollo also serves as our testing ground for bleeding-edge Fedify features before they're officially released.

BotKit

BotKit (@botkit) is our newest family member—a framework specifically designed for creating ActivityPub bots. Unlike traditional Mastodon bots, #BotKit creates standalone ActivityPub servers that aren't constrained by platform-specific limitations (like character counts).

BotKit's API is intentionally simple—you can create a complete bot in a single TypeScript file!

All three projects are open source and hosted under the @fedify-dev GitHub organization. While they serve different purposes, they share common goals: making ActivityPub development more accessible and expanding the fediverse ecosystem.

If you're interested in trying any of these projects or contributing to their development, check out:

• Fedify: https://fedify.dev/
• Hollo: https://docs.hollo.social/
• BotKit: https://botkit.fedify.dev/

We're excited to announce two major features coming in #Fedify 1.5.0, focused on giving you more control over domain names in your federated apps:

Separate WebFinger Host from Server Origin

Want different domains for your WebFinger handles and server URIs? Fedify 1.5.0 will let you use domains like @alice@example.com as fediverse handles while serving content from https://ap.example.com. This gives you more flexibility in how you structure your federated services.

Canonical Origin Support

Need to ensure consistent URLs across your infrastructure? The new canonical origin support lets you explicitly set your server's authoritative domain. This is particularly useful when running behind reverse proxies or load balancers—no more unexpected URLs generated from internal hostnames.

These features represent our ongoing commitment to making Fedify more flexible and production-ready.

Can't wait to try these features? You can experiment with them today using our unstable release v1.5.0-dev.680+562e3dc0 (JSR & npm). Keep in mind that this is an unstable release intended for testing—use it in production at your own risk.

Otherwise, stay tuned for the stable Fedify 1.5.0 release!

Build your own #fediverse server with #Fedify!

Fedify is a #TypeScript framework that simplifies #ActivityPub implementation. Want to build a federated server without the complexity? Fedify has got you covered!

Key features

• Complete protocol support including WebFinger, HTTP Signatures, and NodeInfo
• Enhanced interoperability with Object Integrity Proofs and Linked Data Signatures
• Type-safe Activity Vocabulary API to prevent development mistakes
• Reliable delivery with automatic retries and message queues
• Full observability through OpenTelemetry integration
• Multiple backend support: Redis, PostgreSQL, AMQP
• Seamless integration with popular web frameworks: Express, Hono, Fresh, SvelteKit
• Comprehensive logging and tracing

CLI toolchain

• Debug ActivityPub in real-time with ephemeral inbox server
• Inspect ActivityPub objects and actors with lookup tool
• Tunnel your local server for development

Runtime support

• Deno
• Node.js
• Bun

Easy to learn

• Extensive docs
• Step-by-step tutorials
• Community support via Matrix & Discord

Available under the #MIT license—free and open source!

Excited to share that Fedify CLI is now available on Scoop for #Windows users! You can easily install it with scoop install fedify. One more way to get started with #ActivityPub development!

https://github.com/ScoopInstaller/Main/pull/6371

A milestone worth celebrating—#Fedify just hit 100+ releases! From day one, we've been committed to building a robust #ActivityPub framework, and each release has brought us closer to that goal. Here's to many more releases as we continue growing the #fediverse together! #fedidev

BotKit 0.1.1 is out!

This security update fixes a message visibility bug where direct/followers-only replies to bots were unintentionally forwarded to bot followers. Upgrade recommended. Download at JSR:

deno add jsr:@fedify/botkit@^0.1.1

We're considering adding custom background task support to #Fedify 1.5.0.

Want to use Fedify's worker system for your own background tasks? We're exploring ways to let you register and process custom tasks alongside #ActivityPub jobs.

Check out the proposal: https://github.com/fedify-dev/fedify/issues/206.

Key considerations:

• Should this be part of Fedify's scope?
• Quick API extension vs complete worker architecture redesign
• Integration with existing task queue systems

We'd love to hear your thoughts! Do you need this feature? How would you use it? Share your feedback in the issue thread.