Google Tag Manager – Dotnet Indie Stack

Google Tag Manager (GTM) is a free tag management system that lets you deploy and manage marketing, analytics, and advertising tags on your website or mobile app without modifying code directly.

Features

Tag Templates

100+ built-in tag templates (Google Analytics 4, Google Ads, Facebook Pixel, LinkedIn Insight, and more)
Custom HTML and JavaScript tags for any third-party tool
Community Template Gallery for additional integrations

Triggers & Variables

Rich trigger system: page views, clicks, form submissions, scroll depth, YouTube video events, timer events
Built-in variables (URL, click text, form ID) and custom variable types
Regular expression and CSS selector matching for precise targeting

Version Control & Collaboration

Full version history with one-click rollback
Preview and debug mode to test changes before publishing
Workspaces for team collaboration without conflicts

Data Layer Integration

Push structured data from your application to GTM
Capture e-commerce events, user properties, and custom dimensions
Seamless integration with Google Analytics 4 enhanced measurement

Quick Start

Add the GTM container snippet to your HTML:

<!-- GTM head snippet (inside <head>) -->
<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>

<!-- GTM body snippet (immediately after opening <body>) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-XXXXXXX"
height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>

Push custom events to the data layer:

window.dataLayer = window.dataLayer || [];
window.dataLayer.push({
    event: 'purchase',
    ecommerce: {
        transaction_id: 'T_12345',
        value: 25.42,
        currency: 'USD',
        items: [{ item_name: 'Pro Plan', price: 25.42 }]
    }
});

Use Cases

Install Google Analytics 4 without touching application code
Track conversion events for Google Ads and Meta Ads
A/B test tag deployments in preview mode before release
Centralise all third-party tracking scripts in one place
Integrate heatmap tools (Hotjar, Microsoft Clarity) with a few clicks

Pricing

Google Tag Manager is completely free with no usage limits.