getFrontendVariable

getFrontendVariable Function

The getFrontendVariable function allows you to access the value of a client-side variable from within a server-side variable in JENTIS.

This is useful for reusing values already extracted on the client side (e.g., page URL, screen size, referrer) inside server-side logic for enrichment, condition handling, or persistence.

---

Purpose

Use this function when:

• You want to reference a client-side variable in a server-side context

• The value has already been collected in the browser automatically by using this function

• You need that value for storage, enrichment, or decision-making server-side

---

Function Definition

Property	Description
Function Name	this.getFrontendVariable
Type	function
Available In	Server-Side Variables
Returns	any (type of the referenced variable)

---

Parameters

Parameter	Description	Type	Required	Example
variable-id	The internal ID of the client-side variable	string		"document_ref_diff"

---

Example Usage

async function() {
  let referrer = this.getFrontendVariable("document_ref_diff");
  return referrer;
}

In this example, the server-side variable accesses the value of the client-side variable document_ref_diff (e.g., the referrer domain) and returns it.

---

Use Cases

• Pass client-extracted values into server-side storage (e.g., store the referrer or screen size)

• Use client-side values for conditions inside a server-side tag

• Enrich server-side payloads with context from the browser

---

Notes

• The referenced client-side variable must be defined and resolved during the same tracking event.

• Use the internal variable ID as shown in the JENTIS Tag Manager.

• The returned type depends on what the client-side variable returns — this can be a string, number, JSON, etc.

---

Summary

this.getFrontendVariable bridges the gap between client-side and server-side logic in JENTIS. It allows you to leverage values already captured on the frontend in your backend processing—ensuring data consistency, reusability, and simplified logic across your tracking stack.