Study first
Review the ideas behind the questions
Review how a server container receives, shapes, and sends measurement data before you judge a server-side GTM setup.
Know what moves to the server
Server-side tagging processes measurement requests in a server container instead of relying only on browser tags.
- A server container runs on a server you control and can route data to analytics or advertising destinations.
- The setup can reduce browser-side tag load and give the team more control over how data is shaped.
- A first-party tagging domain and production-ready server setup should be planned before live traffic depends on the container.
Check how requests become events
A server-side container needs clients to receive incoming requests and turn them into event data for tags.
- A client claims a matching request, transforms it into one or more events, and passes those events to tags, triggers, and variables.
- Client priority matters because the first matching client handles the request.
- Extra parameters may need client configuration before tags can use them.
Control data before tags use it
Server-side GTM adds controls for what event data each tag can see or send onward.
- Transformations can allow, add, change, or exclude event parameters before tags use them.
- An allow-list transformation can remove needed parameters if the list is incomplete.
- Preview mode should be used to check requests, events, transformations, and tag behavior before publishing.