Durable Objects

Durable Objects deliver globally unique, single-threaded compute instances with strongly consistent, transactional storage, enabling stateful serverless applications.

Durable Objects (DOs) are a core primitive of the Cloudflare Workers platform: they combine compute with isolated, persistent storage. Each DO instance is globally addressable by a unique ID, guaranteeing that only one instance of the object executes at any given time, which completely eliminates race conditions and the need for distributed locks. This single-threaded Actor model simplifies building complex stateful systems. Use DOs for real-time coordination: think collaborative editing, multiplayer game sessions, or managing millions of individual user workspaces. The attached storage is fast, transactional, and strongly consistent, supporting up to 10 GB of data or a SQLite backend, all without managing any infrastructure.

https://developers.cloudflare.com/durable-objects/