---
title: Publish to a Queue via Workers
description: Publish to a Queue directly from your Worker.
image: https://edgetunnel-b2h.pages.dev/dev-products-preview.png
---

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# Publish to a Queue via Workers

Publish to a Queue directly from your Worker.

The following example shows you how to publish messages to a Queue from a Worker. The example uses a Worker that receives a JSON payload from the request body and writes it as-is to the Queue, but in a real application you might have more logic before you queue a message.

## Prerequisites

* A [queue created](https://edgetunnel-b2h.pages.dev/queues/get-started/#3-create-a-queue) via the [Cloudflare dashboard ↗](https://dash.cloudflare.com) or the [wrangler CLI](https://edgetunnel-b2h.pages.dev/workers/wrangler/install-and-update/).
* A [configured **producer** binding](https://edgetunnel-b2h.pages.dev/queues/configuration/configure-queues/#producer-worker-configuration) in the Cloudflare dashboard or Wrangler file.

Configure your Wrangler file as follows:

* [  wrangler.jsonc ](#tab-panel-10475)
* [  wrangler.toml ](#tab-panel-10476)

**JSONC**

```jsonc
{
  "$schema": "./node_modules/wrangler/config-schema.json",
  "name": "my-worker",
  "queues": {
    "producers": [
      {
        "queue": "my-queue",
        "binding": "YOUR_QUEUE"
      }
    ]
  }
}
```

**TOML**

```toml
"$schema" = "./node_modules/wrangler/config-schema.json"
name = "my-worker"


[[queues.producers]]
queue = "my-queue"
binding = "YOUR_QUEUE"
```

### 1\. Create the Worker

The following Worker script:

1. Validates that the request body is valid JSON.
2. Publishes the payload to the queue.

**TypeScript**

```ts
interface Env {
  YOUR_QUEUE: Queue;
}


export default {
  async fetch(req, env, ctx): Promise<Response> {
    // Validate the payload is JSON
    // In a production application, we may more robustly validate the payload
    // against a schema using a library like 'zod'
    let messages;
    try {
      messages = await req.json();
    } catch {
      // Return a HTTP 400 (Bad Request) if the payload isn't JSON
      return Response.json({ error: "payload not valid JSON" }, { status: 400 });
    }


    // Publish to the Queue
    try {
      await env.YOUR_QUEUE.send(messages);
    } catch (e) {
      const message = e instanceof Error ? e.message : "Unknown error";
      console.error(`failed to send to the queue: ${message}`);
      // Return a HTTP 500 (Internal Error) if our publish operation fails
      return Response.json({ error: message }, { status: 500 });
    }


    // Return a HTTP 200 if the send succeeded!
    return Response.json({ success: true });
  },
} satisfies ExportedHandler<Env>;
```

To deploy this Worker:

```sh
npx wrangler deploy
```

### 2\. Send a test message

To make sure you successfully write a message to your queue, use `curl` on the command line:

```sh
# Make sure to replace the placeholder with your shared secret
curl -XPOST "https://YOUR_WORKER.YOUR_ACCOUNT.workers.dev" --data '{"messages": [{"msg":"hello world"}]}'
```

```sh
{"success":true}
```

This will issue a HTTP POST request, and if successful, return a HTTP 200 with a `success: true` response body.

* If you receive a HTTP 400, this is because you attempted to send malformed JSON to your queue.
* If you receive a HTTP 500, this is because the message was not written to your Queue successfully.

You can use [wrangler tail](https://edgetunnel-b2h.pages.dev/workers/observability/logs/real-time-logs/) to debug the output of `console.log`.

```json
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{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/queues/","name":"Queues"}},{"@type":"ListItem","position":3,"item":{"@id":"/queues/examples/","name":"Examples"}},{"@type":"ListItem","position":4,"item":{"@id":"/queues/examples/publish-to-a-queue-via-workers/","name":"Publish to a Queue via Workers"}}]}
```