Skip to content
No description, website, or topics provided.
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.
src support start disconnected Jan 23, 2020
LICENSE Add license May 8, 2019 Fixing typos and errors Sep 28, 2019

Websocket Provider

The Websocket Provider implements a classical client server model. Clients connect to a single endpoint over Websocket. The server distributes awareness information and document updates among clients.

The Websocket Provider is a solid choice if you want a central source that handles authentication and authorization. Websockets also send header information and cookies, so you can use existing authentication mechanisms with this server.

  • Supports cross-tab communication. When you open the same document in the same browser, changes on the document are exchanged via cross-tab communication (Broadcast Channel and localStorage as fallback).
  • Supports exchange of awareness information (e.g. cursors).
Client Code:
import * as Y from 'yjs'
import { WebsocketProvider } from 'yjs/provider/websocket.js'

const doc = new Y.Doc()
const wsProvider = new WebsocketProvider('ws://localhost:1234', 'my-roomname', doc)

wsProvider.on('status', event => {
  console.log(event.status) // logs "connected" or "disconnected"
Start a Websocket Server:
PORT=1234 npx y-websocket-server

Since npm symlinks the y-websocket-server executable from your local ./node_modules/.bin folder, you can simply run npx. The PORT environment variable already defaults to 1234.

Websocket Server with Persistence

Persist document updates in a LevelDB database.

See [LevelDB Persistence](#LevelDB Persistence) for more info.

PORT=1234 YPERSISTENCE=./dbDir node ./node_modules/y-websocket/bin/server.js


These are mere suggestions how you could scale your server environment.

Option 1: Websocket servers communicate with each other via a PubSub server. A room is represented by a PubSub channel. The downside of this approach is that the same shared document may be handled by many servers. But the upside is that this approach is fault tolerant, does not have a single point of failure, and is fit for route balancing.

Option 2: Sharding with consistent hashing. Each document is handled by a unique server. This pattern requires an entity, like etcd, that performs regular health checks and manages servers. Based on the list of available servers (which is managed by etcd) a proxy calculates which server is responsible for each requested document. The disadvantage of this approach is that load distribution may not be fair. Still, this approach may be the preferred solution if you want to store the shared document in a database - e.g. for indexing.


The MIT License © Kevin Jahns

You can’t perform that action at this time.