y-sweet is an open-source server for building realtime applications on top of the Yjs CRDT library.
- 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.
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 withy-sweet-serverfrom 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.
| 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 |
| Package Manager | Name | Version | Path |
|---|---|---|---|
| npm | @y-sweet/sdk |
 |
js-pkg/sdk |
| npm | @y-sweet/react |
 |
js-pkg/react |