Google Analytics - User Identification




The user id is the named id (the id of your application)

You can specify a user id when creating a tracker.

ga('create', {
  trackingId: 'UA-XXXXX-Y',
  cookieDomain: 'auto',
  name: 'myTracker',
  userId: '12345'

from doc

Client Id

The client id is an id generated if the user id is not specified.

See also: Google Analytics - Client Id (cid) - Anonymous Id

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