Following Google instructions I am setting consent on a website I am working on. I am able to set gtag() consent through GTM and everything else, I was wondering: how do I get back the values that user set in gtag('consent')? (such as default|update and ad_user_data,functionality_storage, etc.)

The Google documentation explains that gtag() has a gtag('get') option, but gtag('consent') seems to be a pletely different option on which gtag('get') does not work, and I cannot retrieve values set.

Following Google instructions I am setting consent on a website I am working on. I am able to set gtag() consent through GTM and everything else, I was wondering: how do I get back the values that user set in gtag('consent')? (such as default|update and ad_user_data,functionality_storage, etc.)

The Google documentation explains that gtag() has a gtag('get') option, but gtag('consent') seems to be a pletely different option on which gtag('get') does not work, and I cannot retrieve values set.

• javascript
• google-tag-manager
• gtag.js
• cookieconsent

• 1 Please see How to Ask, then revise your title to ask a clear, specific question. Don't add tags (especially abbreviations). Also, never link "here". – isherwood Commented Feb 28, 2024 at 15:10

3 Answers 3

It is possible to use this function:

window.google_tag_data.ics.getConsentState("analytics_storage");

0 indicates no consent (denied), and 1 signifies consent has been granted.

Im not an expert regarding this subject but i found something that worked for me:

dataLayer

Is a variable that seems to include all internal data of gtag. Therefore what you can do:

Object.values(dataLayer).filter(a=> typeof a === 'object' && a?.[0] === 'consent')

Should return all consents. This should return all consent objects from dataLayer regarding consent.

Since it stores the history with all changes to datalayer personally I prefer to have an object that simply represents the current state of consent:

//merges an array of objects into a single object, where properties from later objects overwrite those from earlier ones
function mergeObjects(array) {
return array.reduce((acc, obj) => ({ ...acc, ...obj }), {});
}

const consentHistory = Object.values(dataLayer).filter(a=> typeof a === 'object' && a[0] === 'consent');

mergeObjects(consentHistory.map(a=>a?.[2]||{}));

This code snippet returns on my end:

{
"ad_storage": "granted",
"ad_user_data": "granted",
"ad_personalization": "granted",
"analytics_storage": "granted",
"functionality_storage": "granted",
"personalization_storage": "granted",
"security_storage": "granted"
}

Notice I didn't test it in detail.

If you have GTM then window.google_tag_data.ics.entries contains information on the current consent states.

A hacky method is to intercept all pushes to the data layer and monitor for consent mands. To get it right is a bit plex as you need to merge the data in the mands and update override defaults. It is also not aware of all consent changes within GTM.