Google Tag Manager on Fork CMS | OpsBlu Docs

Google Tag Manager on Fork CMS

How to install and configure Google Tag Manager on Fork CMS. Covers installation method, container setup, verification, and Fork CMS-specific...

For general GTM concepts, see Google Tag Manager Overview

Overview

Fork CMS uses Twig templates. Add GTM in your theme's layout template.

Prerequisites

Installation

Where to Add GTM Code

Edit src/Frontend/Themes/your-theme/Core/Layout/Templates/default.html.twig — add head snippet in <head> block and body snippet after <body>

GTM Head Snippet

Add this in the <head> section:

<!-- Google Tag Manager -->
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','GTM-XXXXXXX');</script>
<!-- End Google Tag Manager -->

GTM Body Snippet

Add this immediately after the opening <body> tag:

<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-XXXXXXX"
height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- End Google Tag Manager (noscript) -->

Replace GTM-XXXXXXX with your actual Container ID in both snippets.

Fork CMS-Specific Considerations

Fork CMS templates use Twig. The GTM snippet works directly — JavaScript curly braces inside <script> tags don't conflict with Twig's {{ }} syntax.

Template System

Fork CMS uses Twig templates in src/Frontend/Themes/. When editing templates directly, note that the GTM JavaScript snippet (inside <script> tags) will not conflict with the template engine's syntax.

Verification

After installation, verify GTM is working:

  1. GTM Preview Mode — In GTM, click Preview, enter your site URL, and verify the container loads.
  2. Browser Console — Open DevTools (F12) and run console.log(window.google_tag_manager). You should see an object (not undefined).
  3. Network Tab — Filter for googletagmanager.com and verify gtm.js loads with a 200 response.
  4. Data Layer Check — Run console.log(window.dataLayer) to verify the data layer array exists.

Next Steps

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