Why you should implement Google Tag Manager (GTM) server-side setup

GTM Server-Side setup enhances tracking & data management by moving tag execution from the client side (browser) to a server you control. Instead of the browser firing tags directly, data is sent to your server, and then tags are triggered there. This setup provides more control and greater flexibility when managing tags, tracking, and ensuring data privacy.

The above image shows year-on-year across one of our clients. They are not alone in seeing massive growth (10,000%) in traffic from some countries. A deeper dive shows engagement time averaging less than 1 second. We solve this problem with server-side GTM. But that’s not the only benefit.

Key Components of Server-Side GTM:

1. GTM Container on the Server: Instead of relying on a client-side container (which runs in the user’s browser), the GTM container is hosted on your server, where you can route data through it.

2. Server-Side Tag Execution: Tags (such as for analytics, advertising, or other tracking) are executed on the server, reducing the reliance on the client-side JavaScript execution.

Why Server-Side GTM is Helpful:

1. Improved Data Privacy

• Control Over Data: You have more control over what data gets shared with third parties. With Server-Side GTM, you can filter and modify data before it leaves your server. This ensures you’re only passing the necessary information.
• Reduced Exposure: Since tags are executed server-side, user data isn’t exposed directly to third parties in the browser. As a result, this can help reduce privacy concerns.

2. Better Performance

• Reduced Load Time: Controlling which tags are fired and when means you minimize unnecessary load on the browser. This results in improving page speed and user experience.
• Fewer Client-Side Requests: Server-side tags don’t require the same JavaScript and cookies as client-side tags. This means a reduced number of network requests made by the browser.

3. Enhanced Security

• Less Client-Side Exposure: With client-side tracking, malicious actors could potentially exploit vulnerabilities in your tracking code. By moving the tracking to the server, you can protect the integrity of your data.
• Secure Data Handling: You can also filter and sanitize the data that’s passed to third parties, reducing the risk of leaking sensitive or unnecessary data.

4. More Flexibility

• Customizable Data Processing: Since you’re controlling the server, you can use server-side logic to manipulate the data, make transformations, and apply custom rules before it’s sent to the desired platform (e.g., Google Analytics, Facebook Pixel).
• Integration with Internal Systems: Server-side GTM allows better integration with your own internal systems and databases for more accurate and sophisticated tracking.

5. Ad Blocking Bypass

• Bypass Browser Ad Blockers: Many ad blockers focus on preventing client-side tracking scripts from running. With server-side GTM, tracking data is sent directly from the server, which can bypass many ad blockers and ensure you still capture necessary analytics data.

6. Accuracy in Tracking

• Better Control Over Data: Server-side GTM can help reduce the possibility of data discrepancies caused by issues like ad-blocking or slow browser performance, leading to more accurate and reliable tracking data.

Potential Challenges

• Initial Setup Complexity: Server-side GTM setup requires a more technical infrastructure, including setting up a server and configuring the GTM server container, which might be more complex compared to a standard client-side GTM setup.
• Maintenance: You’ll need to maintain the server infrastructure to ensure everything runs smoothly, which could involve ongoing costs and technical support.

How Google Tag Manager Server-Side Works

• Data Collection: The browser or app sends data (like page views, form submissions, etc.) to your server.
• Processing: Your server processes this data, often enriching it with additional context (session data or user information from your CRM).
• Tag Execution: Server-side GTM triggers the necessary tags and forwards the data to the respective platforms (e.g., GA4, Facebook, etc.).

In summary, Google Tag Manager server-side setup offers better control, privacy, performance, and security. It’s particularly helpful for businesses concerned with data accuracy, privacy, and the growing impact of ad blockers on tracking. However, the complexity of setup and maintenance should be considered, especially for smaller teams or less technical users.

If you need help with this or any other matters digital, please give us a call