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

• API docs
  • Vanilla JS client
  • React hooks
  • Document management SDK
• Y-Sweet Cloud (managed service) docs

Packages

Server

Package Manager	Name	Version	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