Track dynamic variables

Dynamic variables are additional information on the session that can be used to segment sessions.

For example, they can include information on the A/B Test variations displayed to the current user.

  • It is possible to save up to 40 distinct dynamic variable keys per screen view. If more are received, only the first 40 keys will be kept.
  • If you are using the same key twice, the last value associated with the key will be collected.
  • Every dynamic variable is composed of a pair of key (max. 512 characters) and value (max. 255 characters string or a whole number between 0 and 232 - 1 ). The SDK will trim the exceeding characters.
  • If key or value is empty, the SDK will send the string “cs-empty”.

To define and send a dynamic variable, use the API below. For each dynamic variable, we send:

  • Key (string, mandatory)
  • Value (string or integer, mandatory)

Note that if you send an integer as a value, it has indeed to be an integer. A null or a float will not be accepted as a valid parameter, and will result in an error.

import { ContentsquarePlugin, DynamicVarItem } from '@contentsquare/capacitor-plugin';
const myDynamicVar: DynamicVarItem = {
dynVarKey: 'myKey',
dynVarValue: 32,
.catch(err => {
// Handle Error

Sending a dynamic variable for each session

Section titled Sending a dynamic variable for each session

You may want to send a dynamic variable for each session (like the user’s country or store). While triggering the dynamic variable at app launch will cover most cases, it will not be enough. A session can start when the app is put in foreground, after staying in background for more than 30 minutes. See Session definition for more information.

That is why we also recommend sending such dynamic variable every time the app enters foreground.

You can use the appStateChange event triggered by Capacitor to detect foreground and trigger a dynamic variable.