---
title: Connect to Workers and Bindings
description: Access KV, R2, Durable Objects, and other bindings from a container.
image: https://developers.cloudflare.com/dev-products-preview.png
---

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# Connect to Workers and Bindings

Containers can access [Workers bindings](https://developers.cloudflare.com/workers/runtime-apis/bindings/) — KV, R2, D1, Durable Objects, and others — through [outbound handlers](https://developers.cloudflare.com/containers/platform-details/outbound-traffic/#define-outbound-handlers). An outbound handler intercepts HTTP requests from the container and runs inside the Workers runtime, where all of your configured bindings are available.

The container makes a plain HTTP request to a virtual hostname (for example, `http://my.kv/some-key`), and the outbound handler resolves it using the bound resource. No SDK or client library is required inside the container.

## Use bindings in outbound handlers

Define an `outboundByHost` handler for each virtual hostname. The `env` argument gives you access to every binding declared in your Wrangler configuration.

JavaScript

```
export class MyContainer extends Container {}
MyContainer.outboundByHost = {  "my.kv": async (request, env, ctx) => {    const url = new URL(request.url);    const key = url.pathname.slice(1);    const value = await env.KV.get(key);    return new Response(value);  },  "my.r2": async (request, env, ctx) => {    const url = new URL(request.url);    // Scope access to this container's ID    const path = `${ctx.containerId}${url.pathname}`;    const object = await env.R2.get(path);    return new Response(object?.body ?? null, { status: object ? 200 : 404 });  },};
```

The container calls `http://my.kv/some-key` and the handler resolves it using the KV binding. A call to `http://my.r2/file.png` reads from R2, scoped to the current container instance.

Note

You can use `ctx.containerId` to apply different rules per container instance — for example, to look up per-instance configuration from KV.

## Access Durable Object state

The `ctx` argument exposes `containerId`, which lets you interact with the container's own Durable Object from an outbound handler.

JavaScript

```
"get-state.do": async (request, env, ctx) => {  const id = env.MY_CONTAINER.idFromString(ctx.containerId);  const stub = env.MY_CONTAINER.get(id);  // Assumes getStateForKey is defined on your DO  return stub.getStateForKey(request.body);},
```

## Related resources

* [Handle outbound traffic](https://developers.cloudflare.com/containers/platform-details/outbound-traffic/) — Block, allow, and intercept all outbound HTTP from a container
* [Environment variables and secrets](https://developers.cloudflare.com/containers/platform-details/environment-variables/) — Configure secrets and environment variables
* [Durable Object interface](https://developers.cloudflare.com/durable-objects/api/container/) — Full `ctx.container` API reference

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