Durable Objects

Build stateful, coordinated applications on Cloudflare's edge using Durable Objects.

When to Use

• Creating new Durable Object classes for stateful coordination
• Implementing RPC methods, alarms, or WebSocket handlers
• Reviewing existing DO code for best practices
• Configuring wrangler.jsonc/toml for DO bindings and migrations
• Writing tests with @cloudflare/vitest-pool-workers
• Designing sharding strategies and parent-child relationships

Reference Documentation

• ./references/rules.md - Core rules, storage, concurrency, RPC, alarms
• ./references/testing.md - Vitest setup, unit/integration tests, alarm testing
• ./references/workers.md - Workers handlers, types, wrangler config, observability