Your tags are only as good as the data layer behind them
When the data layer is wrong, every tag reading from it is wrong too, and the report looks fine until someone digs in. DataTrue validates your data layer across the site and through your key journeys, and can push edge-case values into it on purpose to test what happens when reality gets messy.
The full platform, every feature, free for 30 days.
The data layer is a structured JavaScript object that holds the information your tags read, such as product details, prices, and user actions. Data layer testing checks it is present, correctly structured, and populated at every step. DataTrue validates it automatically and can push edge-case values into it to test what is hard to reproduce by hand.
Why validate the data layer separately?
A tag can fire perfectly and still send the wrong number, because the value it read from the data layer was already wrong. DataTrue checks the data layer itself: is the object present, is it structured correctly, are the values right, on every page and at every step of a journey.
How do you test data-layer edge cases?
Some of the worst data-layer bugs only appear in states you cannot easily click your way into: an out-of-stock item, an empty array, an unusual string format, a price with the wrong decimal. DataTrue can push those values into the data layer programmatically and check what the tags do with them, so the edge case is tested before a customer hits it.
Fits your GA4 and GTM stack
Data layer validation sits under your GA4 and Google Tag Manager setup, so a broken data layer is caught before it corrupts GA4 reporting.
Guides: a guide to data layers, automated data layer testing, GA4 ecommerce setup, and GA4 event tracking.
Part of the same test, before and after publish
Data-layer checks run inside your coverage scans and journey tests, on the live site and against an unpublished container. See web analytics testing and pre-publish tag testing.
Nothing is installed on your site. DataTrue doesn’t ask you to add any script, tag or code to your pages, so there is nothing to remove if you stop.
Catch a broken data layer before your reports do.
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What is data layer testing?
Checking that the data layer, the object your tags read from, is present, correctly structured, and populated with the right values at every step. DataTrue validates it automatically.
Why validate the data layer separately from tags?
Because tags read from it. A correct tag firing on a broken data layer still sends wrong data.
Can you test edge cases like empty or out-of-stock values?
Yes. DataTrue can push those values into the data layer programmatically and check the result.
Does it work with GA4 and GTM?
Yes, it validates the data layer feeding your GA4 and Google Tag Manager setup.
Related: web analytics testing, pre-publish tag testing. Guides: a guide to data layers.
Put your tag and consent testing on a schedule
DataTrue runs coverage scans, journeys and consent checks on your live site, reads what each tag sends, and alerts your team when a result changes. There’s nothing of ours to install on your pages.
- Every page, with coverage scans
- Scheduled runs, with alerts when a result changes
- Full journeys, like checkout and signup, in each consent state
- What each tag sent, field by field
- PII detection with test personas
- iOS and Android app testing
- Pre-publish testing for GTM and Adobe Tags
- REST API, plus Slack and Jira alerts
The full platform, every feature, free for 30 days.
