Session source
Where the traffic for a session originated, e.g. google, newsletter, or (direct).
Ask it in plain English
"Break down sessions by source and medium."
Field details
| Type | Dimension |
| GA4 API name | sessionSource |
Good to know
Set once at the start of the session and never updates mid-session - clicking an internal link with different UTM parameters part-way through a visit doesn't change this value retroactively; per the sessions entry, GA4 attributes that kind of change to a new session instead.
Ask your own Google Analytics about this
Connect once, then ask in plain English. No tokens, no setup.
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Related fields
Sources
- Google Analytics Data API - dimensions & metrics reference (official Google documentation)