_hjSession is set by Hotjar Ltd to group a user's pageviews into a single browsing session for behaviour analytics.
Who sets it
Hotjar Ltd — loaded as part of the Hotjar behaviour analytics script (session recordings, heatmaps).
What it does
Groups consecutive pageviews into one session so Hotjar can attribute interactions, recordings, and heatmap data to the correct session window.
Duration
Expires after 30 minutes of inactivity. Each time a user becomes active again a new session starts.
Consent type
Analytics / non-essential — requires user consent under GDPR and similar privacy laws.
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