Photo by Greg Rakozy on Unsplash

Unlike Adobe Launch or Tealium, the Google Tag Manager uses a nested dataLayer Object to structure its content. Since I kinda “grow up” with GTM, I am totally used to that. But recently I had within a client project a use case where I preferred to use a flat dataLayer.

A flat dataLayer can esp. help you with custom JavaScripts while not using GTM variables. The GTM variables are already working as a flat dataLayer object anyway.

The following code snippet will make the dataLayer flat.

Important: duplicate keys will be overwritten with the latest one. This is actually the key feature here, but important to know and understand.

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