---
title: Dead Letter Queues
description: Route failed messages to a Dead Letter Queue after exceeding the retry limit.
image: https://edgetunnel-b2h.pages.dev/dev-products-preview.png
---

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# Dead Letter Queues

A Dead Letter Queue (DLQ) is a common concept in a messaging system, and represents where messages are sent when a delivery failure occurs with a consumer after `max_retries` is reached. A Dead Letter Queue is like any other queue, and can be produced to and consumed from independently.

With Cloudflare Queues, a Dead Letter Queue is defined within your [consumer configuration](https://edgetunnel-b2h.pages.dev/queues/configuration/configure-queues/). Messages are delivered to the DLQ when they reach the configured retry limit for the consumer. Without a DLQ configured, messages that reach the retry limit are deleted permanently.

For example, the following consumer configuration would send messages to our DLQ named `"my-other-queue"` after retrying delivery (by default, 3 times):

* [  wrangler.jsonc ](#tab-panel-10458)
* [  wrangler.toml ](#tab-panel-10459)

**JSONC**

```jsonc
{
  "queues": {
    "consumers": [
      {
        "queue": "my-queue",
        "dead_letter_queue": "my-other-queue"
      }
    ]
  }
}
```

**TOML**

```toml
[[queues.consumers]]
queue = "my-queue"
dead_letter_queue = "my-other-queue"
```

You can also configure a DLQ when creating a consumer from the command-line using `wrangler`:

```sh
wrangler queues consumer add $QUEUE_NAME $SCRIPT_NAME --dead-letter-queue=$NAME_OF_OTHER_QUEUE
```

To process messages placed on your DLQ, you need to [configure a consumer](https://edgetunnel-b2h.pages.dev/queues/configuration/configure-queues/) for that queue as you would with any other queue.

Messages delivered to a DLQ without an active consumer will persist for four (4) days before being deleted from the queue.

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```