What is the maximum storage for a Durable Object?

As of April 2025, Durable Objects using the SQLite backend support up to 10GB of storage per object, significantly up from the previous 1GB limit.

When should I use RPC instead of HTTP Fetch?

RPC is recommended for most internal communication because it is type-safe and simpler to implement. Use HTTP Fetch specifically for WebSocket handshakes or when you need standard HTTP routing logic.

How does WebSocket hibernation save costs?

WebSocket hibernation allows your connections to stay active while the Durable Object instance shuts down during idle periods (~10s). The instance only wakes when a message arrives, minimizing active compute time.

Can I use SQL within a Durable Object?

Yes, by enabling the SQLite backend in your wrangler configuration, you can use the ctx.storage.sql API to perform SQL queries, indexing, and atomic transactions.

Cloudflare Durable Objects

Name: Cloudflare Durable Objects
Author: jezweb

byjezweb

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117

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Cloud Infrastructure

Architects stateful, real-time serverless applications using Cloudflare Durable Objects with integrated SQLite and WebSocket hibernation support.

This skill empowers developers to implement persistent state and real-time coordination within Cloudflare Workers environments. It provides comprehensive patterns for building chat rooms, multiplayer games, and complex session management by leveraging the latest Durable Object features, including the 10GB SQLite storage backend, high-capacity WebSocket hibernation, and type-safe RPC communication. Whether you are troubleshooting migration errors or scaffolding a new project, this skill ensures best practices for data persistence and horizontal scaling.

Key Features

01Scaffold and configure Durable Object classes with SQLite or KV storage backends.

02Schedule background tasks and periodic cleanups using the Alarms API.

03117 GitHub stars

04Implement high-concurrency WebSocket hibernation for cost-effective real-time apps.

05Configure type-safe RPC methods for efficient communication between Workers and Objects.

06Manage persistent state with atomic SQL operations and automated migrations.

Use Cases

01Building globally distributed stateful session managers and rate limiters.

02Creating real-time multiplayer coordination and chat platforms.

03Implementing complex background task processing with persistent retries via Alarms.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jezweb/claude-skills cloudflare-durable-objects

For use in Claude.ai and ChatGPT

Download Skill