---
title: Cookies
description: How Waiting Room cookies track visitor sessions.
image: https://developers.cloudflare.com/core-services-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/waiting-room/llms.txt  
> Use this file to discover all available pages before exploring further.

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### Tags

[ Cookies ](https://developers.cloudflare.com/search/?tags=Cookies) 

# Cookies

A waiting room only uses the `__cfwaitingroom` cookie when a visitor requests access to a host and path combination with an enabled and associated waiting room. When the waiting room is suspended, traffic goes to the origin and the `__cfwaitingroom` cookie is not created. The `__cfwaitingroom` cookie is encrypted to prevent modification by users. You may append a [custom suffix](#customize-cookie-name) to your waiting room cookie to customize the name of your waiting room cookie.

Important:

Cloudflare Waiting Room requires the `__cfwaitingroom` cookie. When a waiting room is actively queueing, users cannot visit that host and path combination without enabling cookies.

## Cookie function

The `__cfwaitingroom` cookie is used to:

* Track a user's position in the waiting room queue and serve them in the correct order.
* Monitor each visitor's duration in the application to provide an [accurate entry time](#estimated-wait-time-fifo-queueing-method) to visitors queueing in the waiting room.
* To allow re-entry for a period of time (specified by [session\_duration](https://developers.cloudflare.com/waiting-room/reference/configuration-settings/#session-duration)) without going back in the waiting room.

## Cookie expiration time

* While a visitor stays in a waiting room, `__cfwaitingroom` cookie expiration is always set to five minutes, but renews every 20 seconds automatically as long as the visitor does not close the tab or leaves your application.
* When the visitor accesses the application, the `__cfwaitingroom` cookie expires after an interval (specified by [session\_duration](https://developers.cloudflare.com/waiting-room/reference/configuration-settings/#session-duration)).

## Customize cookie name

You can customize the name of your waiting room cookie by adding a custom suffix to the end of `__cfwaitingroom`.

To do this via the UI, complete the Custom cookie field in the [Create](https://developers.cloudflare.com/waiting-room/how-to/create-waiting-room/) or [Edit](https://developers.cloudflare.com/waiting-room/how-to/edit-delete-waiting-room/) workflow. To do this via the API, enter a value for `cookie_suffix` when creating or editing a waiting room. The cookie suffix is a required field when [using additional hostnames](https://developers.cloudflare.com/waiting-room/how-to/place-waiting-room/) and paths for a single waiting room. Ensure your cookie is compliant with any applicable policies.

## Estimated wait time (FIFO queueing method)

When a visitor first enters the host and path combination for your waiting room, they receive the `__cfwaitingroom` cookie. That cookie contains a unique group ID, which corresponds to the minute your visitor entered the waiting room. Using this value, we can tell how many visitors are in front of a specific group.

Each cookie also contains a value for `acceptedAt`, which corresponds to the minute your visitor entered your application. This value lets us know how many visitors per minute are leaving the waiting room to enter your application.

```

visitorsAhead ÷ activeUsersToWebApplication = estimatedWaitTime


```

We combine these pieces of information to calculate estimated wait time for each group of visitors.

For more details about the technical implementation of Cloudflare Waiting Room, refer to the [blog post ↗](https://blog.cloudflare.com/building-waiting-room-on-workers-and-durable-objects/).

```json
{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/waiting-room/","name":"Waiting Room"}},{"@type":"ListItem","position":3,"item":{"@id":"/waiting-room/reference/","name":"Reference"}},{"@type":"ListItem","position":4,"item":{"@id":"/waiting-room/reference/waiting-room-cookie/","name":"Cookies"}}]}
```