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Which cookies and visitor ID methods are used in Matomo?

7/4/2024

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Picture
In cookieless mode, Matomo works great. Cookieless mode cannot detect the return of the visitor well in that mode but Matomo still gives you 90% of the data you need otherwise.

The main cookie: pk_id

Out of the box (the first time you use it), Matomo's default configuration (1) will set a pk_id cookie. By default the cookie expires in 13 months.

You can see the pk_id cookie right now: try the following.  Open the homepage of Matomo.org (screenshot above). In the browser devtools find pk_id. It is a stringified array. The array holds two things: visitorID of the person and the date the cookie was made.

config_id

The backup plan, if there is no pk_id cookie found in the browser, nor user_id found, will be the "not a fingerprint" number.





Link
1 Matomo Default Configuration: github.com/matomo-org/matomo/blob/5.x-dev/config/global.ini.php
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  • Home
  • What is Matomo
  • Contact
  • Custom Reports
  • Connect Matomo to other software
  • CLI API etc
  • Matomo Tag Manager Simple Guide
  • Lyn Only
  • Troubleshooting + Deploying Matomo
  • Weird Data
  • Why is data in Matomo giving different numbers than Google Analytics
  • The Dashboard
  • Moving the Data
  • Book Club Forum