ShareJS - Concurrent Document Editing

ShareJS is a server and client library designed for real-time, concurrent document editing using operational transformation (OT). It supports OT on plain-text and arbitrary JSON data, allowing multiple users to collaborate on content simultaneously. The server component runs on Node.js, while the client library functions in both Node.js and web browsers, aiming for broad browser compatibility. It depends on LiveDB for its database backend and data model, and explicitly requires developers to provide a communication transport layer that guarantees in-order message delivery, warning against common pitfalls like using Socket.IO without careful configuration. The current stable version mentioned is 0.7.40. Key differentiators include its transport-agnostic design and its focus on raw OT primitives, leaving UI implementation to the developer. The project appears to be unmaintained as of early 2026, with no recent activity on its GitHub repository since around 2017.