I have a script on website (located in functions.php), generating some value which is stored in cookie. I would like to pass this value to a GTM data layer.

I've tried to import this value from from cookie as "1st party cookie" variable, and it works, but don't know how to pass it to a data layer.

Is there any way to use value from cookie deployed outside of GTM as a GTM data layer value?

  • Can you give more details on how you want to use it? In particular, do you need to combine the cookie value with information in the "true" datalayer variable?
    – Reve
    Commented Aug 17, 2020 at 15:47
  • 1st party cookie variable contains some string (taken from the cookie itself). I would like to use that string as a data layer variable value. Is that actually possible? Commented Aug 18, 2020 at 12:29
  • It is possible, but how you do it depends on whether the cookie contains the value of the only variable you need, or whether there are other variables as well - can you clarify?
    – Reve
    Commented Aug 18, 2020 at 13:43
  • Put a different way, why does this variable need to be a data layer variable specifically? What role does it need to play?
    – Reve
    Commented Aug 18, 2020 at 16:49


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