Name

Data storage type

Description

_hjSessionUser_{site_id}

• Set when a user first lands on a page.
• Persists the Hotjar User ID which is unique to that site. Hotjar does not track users across different sites.
• Ensures data from subsequent visits to the same site are attributed to the same user ID.
• 365 days duration.
• JSON data type.

_hjid

• This is an old cookie that we do not set anymore, but if a user has it unexpired in their browser, we will reuse its value and migrate to _hjSessionUser_{site_id}.
• Set when a user first lands on a page.
• Persists the Hotjar User ID which is unique to that site.
• Ensures data from subsequent visits to the same site are attributed to the same user ID.
• 365 days duration.
• UUID data type.

_hjFirstSeen

• Identifies a new user’s first session.
• Used by Recording filters to identify new user sessions.
• 30 minutes duration, extended on user activity.
• Boolean true/false data type.

_hjHasCachedUserAttributes

• Enables us to know whether the data set in _hjUserAttributes Local Storage item is up to date or not.
• Session duration.
• Boolean true/false data type.

_hjUserAttributesHash

• Enables us to know when any User Attribute has changed and needs to be updated.
• 2 minutes duration, extended every 30 seconds.
• Content hash data type.

_hjUserAttributes

• Stores User Attributes sent through the Hotjar Identify API.
• No explicit expiration.
• Base64 encoded JSON data type.

hjViewportId

• Stores user viewport details such as size and dimensions.
• Session duration.
• UUID data type.

Name

Data storage type

Description

_hjSession_{site_id}

• Holds current session data.
• Ensures subsequent requests in the session window are attributed to the same session.
• 30 minutes duration, extended on user activity.
• JSON data type.

_hjSessionTooLarge

• Causes Hotjar to stop collecting data if a session becomes too large.
• Determined automatically by a signal from the server if the session size exceeds the limit.
• Session duration.
• Boolean true/false data type.

_hjSessionResumed

• Set when a session/recording is reconnected to Hotjar servers after a break in connection.
• Session duration.
• Boolean true/false data type.

_hjCookieTest

• Checks to see if the Hotjar Tracking Code can use cookies. If it can, a value of 1 is set.
• Deleted almost immediately after it is created.
• Under 100ms duration, cookie expiration time set to session duration.
• Boolean true/false data type.

_hjLocalStorageTest

• Checks if the Hotjar Tracking Code can use Local Storage.
  If it can, a value of 1 is set.
• Data stored in _hjLocalStorageTest has no expiration time, but it is deleted almost immediately after it is created.
• Under 100ms duration.
• Boolean true/false data type.

_hjSessionStorageTest

• Checks if the Hotjar Tracking Code can use Session Storage. If it can, a value of 1 is set.
• Data stored in _hjSessionStorageTest has no expiration time, but it is deleted almost immediately after it is created.
• Under 100ms duration.
• Boolean true/false data type.

_hjIncludedInPageviewSample

• Set to determine if a user is included in the data sampling defined by your site's pageview limit.
• 2 minutes duration, extended every 30 seconds.
• Boolean true/false data type.

_hjIncludedInSessionSample_{site_id}

• Set to determine if a user is included in the data sampling defined by your site's daily session limit.
• 2 minutes duration, extended every 30 seconds.
• Boolean true/false data type.

_hjAbsoluteSessionInProgress

• Used to detect the first pageview session of a user.
• 30 minutes duration, extended on user activity.
• Boolean true/false data type.

_hjTLDTest

• We try to store the _hjTLDTest cookie for different URL substring alternatives until it fails.
• Enables us to try to determine the most generic cookie path to use, instead of page hostname.
• It means that cookies can be shared across subdomains (where applicable).
• After this check, the cookie is removed.
• Session duration.
• Boolean true/false data type.

Name

Data storage type

Description

_hjRecordingEnabled

• Set when a Recording starts.
• Read when the Recording module is initialized to see if the user is already in a recording in a particular session.
• Session duration.
• Boolean true/false data type.

_hjRecordingLastActivity

• Updated when a user recording starts and when data is sent to the server (the user performs an action that Hotjar records).
• Session duration.
• Numerical value (timestamp) data type.

Name

Data storage type

Description

_hjClosedSurveyInvites

• Set when a user interacts with a Link Survey invitation modal.
• Ensures the same invite does not reappear if it has already been shown.
• 365 days duration.
• List of Survey IDs, URL encoded.

_hjDonePolls

• Set when a user completes an on-site Survey.
• Ensures the same Survey does not reappear if it has already been filled in.
• 365 days duration.
• List of Survey IDs, URL encoded.

_hjMinimizedPolls

• Set when a user minimizes an on-site Survey.
• Ensures that the Survey stays minimized when the user navigates through your site.
• 365 days duration.
• List of Survey IDs, URL encoded.

_hjShownFeedbackMessage

• Set when a user minimizes or completes a Feedback widget.
• Ensures the Feedback widget will load as minimized if the user navigates to another page where it is set to show.
• One day duration.
• Boolean true/false data type.