Chrome extension GTM Helper by Stape: key features and use cases

There are a lot of challenges in the GTM preview interface - many have likely noticed areas that could be improved. Data can often be difficult to read, and navigating the GTM preview can become cumbersome in large containers with numerous active tags. That's where browser extensions help - they make data clearer and navigation easier.

That's why the Stape team made a simple Chrome extension to improve the GTM preview. The whole GTM team uses it, so we know it will help many people.

Stape GTM Helper is a free Chrome extension designed to improve the debugging experience in Google Tag Manager preview mode. The tool provides multiple features for both web and server GTM containers. With this extension, you can easily navigate fired tags, quickly identify failed ones, focus only on the tags you’re testing, and take advantage of other features, which we'll explore in detail below.

Stape GTM Helper will be helpful for anyone configuring data tracking using GTM. It can be used by data tracking specialists, data analysts, freelancers, or agencies that need a convenient tool to simplify the debugging process.

Stape GTM Helper has the following benefits:

The Scan website tab lets you run a fast health check on the tracking setup of any page you're viewing – checking analytics, cookies, ads, and SEO. The report is generated using Website Tracking Checker, so it evaluates the same metrics.

3. Click Scan me.

4. Wait for a couple of minutes and review the results. The extension shows:

5. Click View full report to open the complete Website Tracking Checker report with detailed findings and recommendations. For more information about the metrics read the Website Tracking Checker overview article.

6. Click New scan to re-run the check – useful after making fixes, to confirm your score and statuses improved. 

Past scans remain available under Scan history, so you can compare results over time for the same site.

The Inject GTM feature allows you to inject a GTM container snippet into any website without altering the site's source code or CMS backend. This is useful for testing, debugging, or staging tracking setups on live pages before deploying them. This injection is local to your browser session and doesn't affect your live site or other visitors.

4. Enter the domain name and GTM container ID you want to inject. 

5. Optionally, instead of using the standard Container ID field (which generates a standard gtm.js tag), the Custom Code field accepts any custom script or snippet you want to execute on the target page. If you generated a snippet with the Custom Loader power-up (which routes gtm.js requests through your custom domain/loader path), paste the full HTML <script> block provided by Stape. You can also inject inline JavaScript to initialize data layer variables or push events for testing before GTM loads.

6. Click Save changes.

7. Once enabled, reload the page and open GTM Preview mode. You'll now be able to see the events firing on the previously restricted page.

The Settings tab is where you turn individual debugging features on or off. All toggles are enabled by default, and each affects either the web container, the server container, or both.

Makes request URLs prettier, turning long query strings into a readable table (useful for GA4 requests). Only applicable for server containers.

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Color-codes tags in Preview mode by their firing status, so you can spot failed tags or 4xx/5xx responses at a glance. Applicable for both server and web containers.

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Adds color and platform logos (Meta, GA4, Google Ads, Microsoft, etc.) to tags, making it easier to scan a container with many tags. Applicable for both server and web containers.

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Displays the current Consent Mode status directly in the Request tab, by reading the gcs parameter on GA4 requests. The setting shows both consent type and whether it's Granted or Denied. With this setting you don’t need to look for the gcs parameter in the HTTP requests anymore. Only applicable for server containers.

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Lets you filter tags and variables in a container down to just the ones you're testing. Applicable for both server and web containers.

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After – click on the Tags Filter and select your tag.

Automatically formats and syntax-highlights JSON in debug table cells (incoming/outgoing requests, webhook payloads, etc.). Applicable for both server and web containers.

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In the GTM container workspace, hold Shift and click to select multiple assets in a list at once, instead of checking each box individually. Applicable for both server and web containers.

When debugging a Shopify setup, the GTM dataLayer isn’t visible on the checkout page because Shopify restricts access to the checkout environment. The checkout is isolated and doesn’t allow unrestricted DOM manipulation or script injection, as on other Shopify pages. Enable this setting to manually insert the GTM snippet on the checkout page for it to appear in the Preview mode. Only applicable for server containers.

The free Stape GTM Helper includes an Entities filter, a Request URL format, and a JSON format. The Entities filter allows you to filter certain tags for easier debugging. The URL format enhances the readability of queried parameters in URL requests, while the JSON formatter makes incoming and outgoing JSON requests easier to read. Combined with color-coded tag statuses and types, these features simplify debugging and improve the overall experience when working with sGTM.

Get the free Stape extension from the Chrome Web Store today to make your workflow more straightforward and more efficient. You don't even have to create a Stape account to use the Stape GTM Helper. We'd love to hear your ideas and challenges that the Stape extension can help solve. Feel free to share your suggestions on our Feature Request page.