Google Tag Manager Variable Library

The ggLowCodeGTMKit Variable Library

The complete, composable variable framework for Google Tag Manager. 250+ templates, organized across 14 functional categories, all sharing the same conventions, parameters, and chaining mechanism.

Why Use This Framework?

Feature	Benefit
Self-Documenting	Strict naming (e.g. extractNumber or toCamelCase). Your workspace becomes heavily organized code documentation.
True Low-Code	Perform complex array logic and data extraction entirely through UI dropdowns without writing JavaScript.
Sandboxed & Secure	Variables execute purely inside Google’s Custom Template APIs and never arbitrarily inject code into the DOM.
Data Governance	Clean and strictly validate all data shapes before they are sent to your 3rd-party vendor tags.
AI-Ready	Standardized framework allows LLMs to safely generate configurations without hallucinating risky code.
Unlock New Use Cases	Browsing the 250+ templates will spark totally new ideas and tracking capabilities you didn’t know were possible!

Quick Start — 60 Seconds to Your First Variable

1. Download

Select your container package — from core essentials to all 250+ variables.

2. Import

GTM Admin → Import Container → Merge. All variables appear instantly in your workspace.

3. Configure

Browse the library below, find your variable, configure via the template UI.

4. Deploy

Preview, verify, publish. Your data layer mapping works on the first try.

AI Workflow (Gemini, ChatGPT, Claude…)

Simply give the AI this link: https://youdontknowga.com/llms.txt and describe your data layer. Because this library acts like a standardized programming framework, the AI will perfectly map out the exact chain of variables you need!

Downloads

Package	Description	Link
Full Library	All 250+ variables as a single container JSON	Download
Core Only	Essential framework variables only	Download
Individual Templates	Find specific templates, read docs, and see examples	Browse Library Below

The Framework Pattern

Every variable in the library follows the same standardized interface:

Parameter / Result	Purpose
src (e.g. “Input Value”)	The input data source to act on.
rp1 & rp2 (e.g. “Match Value”)	Template-specific parameters (e.g. the specific name of a property to extract).
pre (“Input Function”)	Optional formatting function to cast or manipulate src before template logic.
out (“Output Function”)	Optional formatting function applied to the transformed result.
Output	The final derived value returned by the variable, ready for the next step in the chain!

Pro Tip

Use Cmd+K (or Ctrl+K) to instantly search across all 250+ variables. The search bar is the fastest way to find exactly what you need.

Two Execution Modes

• Direct Mode — Returns the result immediately, to use like any other Google Tag Manager native variable.
• Apply Mode — Returns a function that can be used in other framework variables to be applied to the source (src) or the output (out). Use for multi-step pipelines.

📖 How-To Guide Step-by-step instructions for installation and variable chaining.

Browse by Category

🔤 String Text manipulation, formatting, parsing

📋 Array List operations, filtering, mapping

📦 Object Key extraction, merging, deep access

🛒 Ecommerce GA4 purchase, items, promotions