Transmitting session parameters

Tip. Working with the JavaScript API requires knowledge of HTML and JavaScript. If you don't know these languages, contact your website developer or webmaster.

Session parameters are transmitted to the tag storage using the JavaScript API. Data can be sent either during tag initialization, or at any time before the session timeout expires.

During tag initialization, session parameters are specified in the params parameter.

To send session parameters during site user sessions, use the params method, or the optional argument for the extLink, file, hit, or reachGoal methods.

Session parameters are transmitted as a JavaScript object or an array.

Attention. Some field names are reserved for transmitting e-commerce data. Don't use these names to send session parameters. Don't send custom parameters with reserved ones.

Up to 1000 parameters can be transmitted in a single session. When the hierarchical data structure is transmitted, the Yandex.Metrica reports will display up to 10 nesting levels. If, within a single session, one parameter was transmitted with different values, then Yandex.Metrica will display all values.

Processing transmitted data

Data that is transmitted to Yandex.Metrica as JavaScript objects are processed as follows.

The field name and nesting level are interpreted as the parameter name and level, respectively. The field value is processed as follows, depending on its type:

  • object — A tree branch is created for each object key, and the algorithm is called recursively for each value.
  • string — Counts the number of times each different value of the string occurs.
  • number — Calculates the total and average value of all numbers.
  • array — Creates a [Parameters] tree branch, calculates the number of times the value is an array, and invokes the algorithm recursively for each item in the array.
  • true, false or null — Calculates the number of times each value occurs.

Parameters are transmitted to Yandex.Metrica as dimensions. The numbers that are calculated by processing the data are the metrics. To view statistics on transmitted session parameters, use the Session parameters report. You can also use parameters as conditions for creating segments in other Yandex.Metrica reports.