---
title: Publish to a Queue via Workers
description: Publish to a Queue directly from your Worker.
image: https://developers.cloudflare.com/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://developers.cloudflare.com/queues/get-started/#3-create-a-queue) via the [Cloudflare dashboard ↗](https://dash.cloudflare.com) or the [wrangler CLI](https://developers.cloudflare.com/workers/wrangler/install-and-update/).
* A [configured **producer** binding](https://developers.cloudflare.com/queues/configuration/configure-queues/#producer-worker-configuration) in the Cloudflare dashboard or Wrangler file.

Configure your Wrangler file as follows:

* [  wrangler.jsonc ](#tab-panel-10010)
* [  wrangler.toml ](#tab-panel-10011)

JSONC

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

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

```
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:

Terminal window

```
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:

Terminal window

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

```
{"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://developers.cloudflare.com/workers/observability/logs/real-time-logs/) to debug the output of `console.log`.

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