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#c2s

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Strypey

"A core objective of Flowz is flexibility and graceful degradation. Even when connected to a server that supports only the minimal core C2S functionality, the client still delivers a reasonable user experience. Users can perform essential actions such as reading timelines and posting updates. However, where Flowz really shines is when it connects to servers that offer extended C2S capabilities."

@stevebate, 2025

stevebate.net/activitypub-clie

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Steve Bate · ActivityPub Client API: A Way Forward | Steve BateThe ActivityPub Client-to-Server (C2S) protocol was envisioned as a cornerstone of the decentralized social web, along with the Server-to-Server (S2S) protocol. Standardized by the W3C in 2018, C2S defines how user-facing applications, such as mobile apps or web clients, and bots should interact with social servers using Activity Streams 2.0 and JSON-LD. In theory, it ... Read more
#ActivityPub#C2S#Flowz
Replied to KungFuDiscoMonkey
just small circles 🕊

@kfdm yes, the information needed to be scraped together. Don't hesitate to add a comment if you find more useful resources around C2S. There is an uptick in interest on the subject currently.

I may create a seperate #C2S section in the delightful #ActivityPub development list, which is to be revamped in similar way as recently the #fediverse experience list.

delightful.coding.social/delig

delightful.coding.socialdelightful activitypub developmentDelightful curated lists of free software, open science and information sources.
KungFuDiscoMonkey

Lists like codeberg.org/fediverse/delight show several server projects for #activitypub , a few that list #c2s but haven't had much luck finding a list of apps that support c2s. I guess it's a chicken/egg problem in many ways. I'd sometimes like to experiment with my own c2s+s2s server implementation, but it's a bit of a larger hurdle if there aren't any c2s desktop/mobile apps to help test with. 🤔

Summary card of repository fediverse/delightful-fediverse-experience
Codeberg.orgdelightful-fediverse-experienceA curated list of server applications supported on the ActivityPub Fediverse and related standards.
julian

Idle thought re: account delegation

I've been toying with the idea of using OAuth2/OpenID and the C2S API to have a service act on behalf of another instance (e.g. act on Lemmy, post as Mastodon account)

But now I'm wondering whether that kind of complexity is needed... one could theoretically register a public key to the instance it is acting on behalf of, and simply sign activities using the ID of the other server... Second server would need only update the actor with the new public key for verification purposes...

community.nodebb.org/post/1051

NodeBB Community · Idle thought re: account delegationI've been toying with the idea of using OAuth2/OpenID and the C2S API to have a service act on behalf of another instance (e.g. act on Lemmy, post as Mastodo...
#ActivityPub#c2s
Replied in thread
Strypey

People keep pointing out the UX fail of expecting people to have multiple accounts to use all the different fedi services. But that wouldn't be true if every #AP app and server used a general purpose #C2S API, defined in the AP spec (whether the existing one or not).

Then we could, for example, use a Mastodon account to login to a PeerTube service to browse and post videos. Or use a PT account to login to a Mastodon service to browse and post Notes.

@tchambers @rakoo @benpate @jupiter_rowland

Replied in thread
just small circles 🕊

@josemurilo yes, remarkable.

I keep track of a list of #ActivityPub #C2S implementations at the newly revamped delightful.coding.social/delig

See: codeberg.org/fediverse/delight

PS. @box464 also tooted about this today and I dropped off the codeberg issue too. I hope to find more C2S implementers or would-be ones.

delightful.coding.socialdelightful fediverse experienceDelightful curated lists of free software, open science and information sources.
洪 民憙 (Hong Minhee)

I've been thinking about client-server interactions in the #fediverse. #ActivityPub #C2S isn't widely used, and most clients rely on Mastodon-compatible APIs instead.

What if we created a new standardized API based on GraphQL + Relay for client-server communication, while keeping ActivityPub for server-to-server federation?

The Mastodon-compatible API lacks formal schema definitions for code generation and type checking, which hurts developer productivity. And ActivityPub C2S is honestly too cumbersome to use directly from client apps.

#GraphQL would give us type safety, efficient data fetching (only get what you need), and the ability to evolve the API without breaking clients. #Relay's features for pagination, caching, and optimistic updates seem perfect for social apps.

Would this be valuable to our community? What challenges do you see? How might we handle backward compatibility? And should this be formalized as an FEP?

Curious what others think about this approach.

graphql.orgGraphQL | A query language for your API
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