Share consents between domains

By default, the Didomi CMP uses first-party cookies to store consent information. Consent is therefore shared across all the sub-domains of the base domain where the SDK is deployed but is not shared across domains.

Example: If you install Didomi on www.domain.com, consents will be stored in a cookie on .domain.com and all sub-domains of domain.com will have access to the same consent information. Other domain names (www.other-domain.com) will NOT have access to that consent information.

With group cookies, consent is stored on a sub-domain that you own and delegate to us (like privacy.your-domain.com) and can be shared across all your websites.

Consents will be shared only between the domains that have activated the group cookies feature with the same specific sub-domain. It allows you to have private consents between your different websites without exposing them to third-parties.

To enable group-level cookies, the steps are the following:

1. Pick a sub-domain that will be used for sharing consent cookies. We recommend picking a sub-domain of your biggest website.

2. Create a DNS NS delegation record on that sub-domain to allow Didomi to manage it. Please reach out to support@didomi.io with the sub-domain that you have picked for help setting up that record.

3. Update your SDK configuration on all the websites that need to share consent:

window.didomiConfig = {
  cookies: {
    group: {
      enabled: true,
      customDomain: 'privacy.your-domain.com'
    }
  }
};

After that setup is done, the Didomi SDK will start using privacy.your-domain.com for storing consent cookies. You must use the same customDomain configuration on all the websites that you want to share consents between.