Last updated: October 2025
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Name
Provider
Type
Purpose
Expiry
_ga
Cookie
Distinguishes unique users
2 years
_ga_<container-id>
Cookie
Maintains session state for GA4 properties
2 years
_gid
Cookie
Distinguishes users for 24 hours
24 hours
gat / _gtag_<property- id>
Cookie
Throttles request rate to improve performance
1 minutes
ga_session_id / GA4 session identifiers
Cookie/Browser storage
Session / up to 30 minutes of inactivity
Name
Provider
Type
Purpose
Expiry
_hjSessionUser_{site_id}
Hotjar
Cookie
Persists a unique user ID across sessions
365 days
_hjSession_{site_id}
Hotjar
Cookie
Holds current session data for same-session requests
30 min (refreshes)
_hjCookieTest
Hotjar
Cookie
Checks if cookies can be set
Session
_hjLocalStorageTest
Hotjar
Local Storage
Checks localStorage availability
Session
_hjTLDTest
Hotjar
Cookie
Finds generic domain for cookie setting
Session
_hjHasCachedUserAttributes
Hotjar
Cookie
Indicates if user attributes are cached
Session
_hjUserAttributesHash
Hotjar
Cookie
Tracks attribute changes
≈ 2 min
_hjClosedSurveyInvites
Hotjar
Cookie
Stores dismissal of survey invites
365 days
_hjDonePolls
Hotjar
Cookie
Records completion of polls
365 days
_hjMinimizedPolls
Hotjar
Cookie
Remembers poll minimisation
≈ 365 days
hjViewportId
Hotjar
Session Storage
Stores current viewport ID
Session
hjActiveViewportIds
Hotjar
Local/Session Storage
Tracks active viewport IDs
Session