> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zeotap.com/llms.txt
> Use this file to discover all available pages before exploring further.

# allowCookieSync

> Enable/Disable cookie syncing functionality.

<Warning>
  **Important:** Please ensure your CMP configuration includes new **Vendor ID 1469** for 1st Party data tracking. Additionally, include **Vendor ID 301** if cookie sync is enabled. [Learn more](/articles/sdks/web-js/configurations/consent-options#shouldcheckzeotapvendorconsent)
</Warning>

**Type:** `Boolean`

**Default:** `true`

**Description:**

This option controls whether the Zeotap Web SDK is permitted to perform **cookie syncing** operations. Cookie syncing is a background process used to match the Zeotap user identifier (ZI) with identifiers from approved third-party advertising platforms or data partners. This matching typically happens via pixel fires or redirects initiated by the SDK.

* **`true` (Default):** When set to `true`, the SDK will automatically initiate cookie syncing processes with all partners. To restrict reach out to Zeotap representative or Support team.
* **`false`:** When set to `false`, the SDK will **not** perform any automatic cookie syncing operations, regardless of consent status.

<Note>
  Cookie sync is controlled based on these flags and does not automatically read the consent status from your CMP. Therefore, if consent has not been provided for any of these partners, ensure the corresponding SDK flag is set to `false`. Currently we support this for custom consent implementation — refer to the [Consent Based cookie syncing](/articles/sdks/web-js/configurations/partner-consent-key-map) configuration to know more.
</Note>

**Usage:**

You configure `allowCookieSync` within the options object passed to the `window.zeotap.init` method.

**Example: Disabling Cookie Sync**

If you want to prevent the SDK from initiating any cookie syncs:

```jsx title="SDK Initialization - Disabling Cookie Sync" theme={null}
window.zeotap.init("YOUR_WRITE_KEY", {
  allowCookieSync: false // Explicitly disable cookie syncing
  // ... other configurations
});
```