y-sweet: a Yjs server with persistence and auth

y-sweet is an open-source server for building realtime applications on top of the Yjs CRDT library.

Features

Persists document data to a network filesystem or S3-compatible storage, inspired by Figma’s infrastructure.
Scales horizontally with a session backend model.
Deploys as a native Linux process, or as a WebAssembly module on Cloudflare's edge.
Provides document-level access control via client tokens.
Written in Rust with a focus on stability and performance, building on the blazing fast y-crdt library.

y-sweet stack

The y-sweet server can be used by any Yjs app, or you can use our opinionated stack to integrate Yjs and y-sweet into a Next.js app.

@y-sweet/sdk, a TypeScript library for interacting with y-sweet-server from your application backend.
@y-sweet/react, a React hooks library for building Yjs applications.
A debugger for exploring Yjs document and presence state.

The goal of the y-sweet stack is to give developers the end-to-end developer ergonomics they would expect from a proprietary state-sync platform, without the lock-in.

y-sweet is MIT-licensed, and was created by Drifting in Space.

Docs

Packages

Server

Package Manager	Name	Path
npm	`y-sweet`	`js-pkg/server`
crates.io	`y-sweet`	`crates/y-sweet`
crates.io	`y-sweet-core`	`crates/y-sweet-core`

Client

Package Manager	Name	Version	Path
npm	`@y-sweet/sdk`		`js-pkg/sdk`
npm	`@y-sweet/react`		`js-pkg/react`

Y-Sweet Cloud

If you were to use the open source y-sweet server alone, you would still have to set up the infrastructure for self hosting it. With Y-Sweet cloud, every document is automatically persisted. You can link your own S3-compatible storage, or just let us take care of the details.

You can try a preview for free today by following our quickstart guide.

If you are interested in being a build partner for early access to new features, please reach out.

We are committed to growing y-sweet as an open-source-first project, wherever you decide to host it.

Gentle/y-sweet