Awesome

ShareDB

ShareDB is a realtime database backend based on Operational Transformation (OT) of JSON documents. It is the realtime backend for the DerbyJS web application framework.

For help, questions, discussion and announcements, join the ShareJS mailing list or read the documentation.

Please report any bugs you find to the issue tracker.

Features

Realtime synchronization of any JSON document
Concurrent multi-user collaboration
Synchronous editing API with asynchronous eventual consistency
Realtime query subscriptions
Simple integration with any database
Horizontally scalable with pub/sub integration
Projections to select desired fields from documents and operations
Middleware for implementing access control and custom extensions
Ideal for use in browsers or on the server
Offline change syncing upon reconnection
In-memory implementations of database and pub/sub for unit testing
Access to historic document versions
Realtime user presence syncing

Documentation

https://share.github.io/sharedb/

Examples

Counter

Leaderboard

Development

Documentation

The documentation is stored as Markdown files, but sometimes it can be useful to run these locally. The docs are served using Jekyll, and require Ruby >2.4.0 and Bundler:

gem install jekyll bundler

The docs can be built locally and served with live reload:

npm run docs:install
npm run docs:start