DurableObjectNamespace

A Durable Object Namespace represents a globally unique namespace for Durable Objects that provide strongly consistent storage and coordination.

Minimal Example

Create a basic Durable Object namespace for stateful chat rooms.

import { DurableObjectNamespace } from "alchemy/cloudflare";

const rooms = new DurableObjectNamespace("chat-rooms", {
  className: "ChatRoom"
});

Create with SQLite Storage

Create a Durable Object with SQLite storage for user data.

import { DurableObjectNamespace } from "alchemy/cloudflare";

const users = new DurableObjectNamespace("user-store", {
  className: "User",
  sqlite: true
});

Create in Production Environment

Create a Durable Object in production for game state management.

import { DurableObjectNamespace } from "alchemy/cloudflare";

const game = new DurableObjectNamespace("game-state", {
  className: "GameState", 
  scriptName: "game-worker",
  environment: "production"
});

Bind to a Worker

Bind a Durable Object namespace to a Worker to enable access.

import { Worker, DurableObjectNamespace } from "alchemy/cloudflare";

const counter = new DurableObjectNamespace("counter", {
  className: "Counter"
});

await Worker("my-worker", {
  name: "my-worker",
  script: "console.log('Hello, world!')",
  bindings: {
    COUNTER: counter
  }
});

Cross-Script Durable Object Binding

Share durable objects between workers by defining them in one worker and accessing them from another:

import { Worker, DurableObjectNamespace } from "alchemy/cloudflare";

// Worker that defines and owns the durable object
const dataWorker = await Worker("data-worker", {
  entrypoint: "./src/data.ts",
  bindings: {
    // Bind to its own durable object
    STORAGE: new DurableObjectNamespace("storage", {
      className: "DataStorage"
    })
  }
});

// Worker that accesses the durable object from another worker
const apiWorker = await Worker("api-worker", {
  entrypoint: "./src/api.ts", 
  bindings: {
    // Cross-script binding to the data worker's durable object
    SHARED_STORAGE: dataWorker.bindings.STORAGE
  }
});