Data Layer

Learn about the data layer that is part of the Universal Data Object generated by utag.js.

The Universal Data Object (UDO) contains built-in variables that collect basic information about the page where it is loaded. These variables include cookies created by utag.js, standard DOM variables from the page, and Tealium-specific variables about the loaded configuration.

Learn more about the types of data layer variables available.

Standard Page Data

The following variables are generated from the standard JavaScript properties available in the web page. These variables appear automatically within the iQ interface for use with load rules, extensions, data mappings, and conditions.

These values assume the URL of the page:
Variable Description Example
dom.domain The full domain of the URL. Source: location.hostname
dom.hash The hash fragment of the URL (excluding the # character). Source: location.hash hash=fragment
dom.pathname The path of the URL, excludes the query parameters and domain. Source: location.pathname "/path/file.html"
dom.query_string The full query string of the URL. Source: param1=value1
dom.referrer URL of previous page. Source: document.referrer
dom.title Text contained between the <title> tags. Source: document.title "Test Page Name"
dom.url The full URL of the page. Source: document.URL PATH/FILE.html?param1=VALUE#hash=FRAGMENT
dom.viewport_height The height of the browser view port. Source: window.innerHeight or document.documentElement. clientHeight 1320
dom.viewport_width The width of the browser view port. Source: window.innerWidth or document.documentElement. clientWidth 1278


The following variables are stored and maintained in a single cookie named utag_main. They appear in the data object as separate variables, all prefixed with cp.utag_main_.

To add these variables to your iQ configuration, use the data bundle named Tealium Built-in Data from the Data Layer tab.

Variable Description Example
cp.utag_main__pn Session Page View Count - The number of pages viewed in the current session 2
cp.utag_main__se Session Event Count - The number of events tracked in the current session 2
cp.utag_main__sn Session Count - The number of sessions for this unique visitor 1
cp.utag_main__ss Is Start of Session - A flag that indicates whether or not a page view is the start of a session (1=yes, 0=no) 0
cp.utag_main__st Timestamp - The Unix/Epoch time stamp in milliseconds 1522968400449
cp.utag_main_ses_id Session ID - A unique identifier for the session 1522965346545
cp.utag_main_v_id Visitor ID - A unique identifier for each visitor 016297481... (45 characters)

Tealium Data

The following variables contain information about the utag.js loaded in the page, along with other values used internally.

Add the ut.* variables to your iQ configuration using the data bundle named Tealium Built-in Data from the Data Layer tab.

Variable Name Example
tealium_account Account Name sandbox
tealium_datasource Data Source Key "abc123"
tealium_environment Publish Environment prod
tealium_event Tealium Event Name (Defaults to “view” or “link” if not set directly) view
tealium_library_name Library Name utag.js
tealium_library_version Library Version 4.44.0
tealium_profile Account Profile main
tealium_random Random Number 7782219635308327
tealium_session_id Copy of utag_main_ses_id 1522965346545
tealium_timestamp_epoch Current Unix timestamp in seconds 1522956509
tealium_timestamp_local Local Timestamp 2018-04-05T12:28:29.019
tealium_timestamp_utc UTC Timestamp 2018-04-05T19:28:29.019Z
tealium_visitor_id Copy of utag_main_v_id 016297481... (45 characters)
ut.account Copy of tealium_account sandbox
ut.domain The top level domain used for setting cookies.
ut.env Copy of tealium_environment prod
ut.event Copy of tealium_event view
ut.profile Copy of tealium_profile main
ut.session_id Copy of tealium_session_id 1522956509018
ut.version The publish version (utag.js version + timestamp) ut4.44.201710171745
ut.visitor_id Copy of tealium_visitor_id 016297481... (45 characters)

Local and Session Storage

Local and session storage keys appear automatically in the data layer using localStorage and sessionStorage variables.

To use these storage variables, navigate to iQ Tag Management > Data Layer > +Add Variable. Select UDO Variable and enter in a source variable name. Use ls.variable_name for local storage and ss.variable_name for session storage.

For more information about local and session storage variables, see Data Layer Variables.


The following is a sample of the built-in data found within

    "cp.utag_main_v_id"       : "015da2e1daf10020914ce74dfaf00207900780700093c",
    "cp.utag_main__sn"        : "389",
    "cp.utag_main__ss"        : "0",
    "cp.utag_main__st"        : "1522970376944",
    "cp.utag_main__se"        : "2",
    "cp.utag_main_ses_id"     : "1522915346545",
    "cp.utag_main__pn"        : "8",
    "qp.param1"               : "value1",
    "qp.hash1"                : "val1",
    "dom.referrer"            : "",
    "dom.title"               : "Test Page",
    "dom.domain"              : "",
    "dom.query_string"        : "param1=value1",
    "dom.hash"                : "hash=fragment",
    "dom.url"                 : "",
    "dom.pathname"            : "/path/file.html",
    "dom.viewport_height"     : 780,
    "dom.viewport_width"      : 1436,
    "ut.domain"               : "",
    "ut.version"              : "ut4.44.201710171745",
    "ut.event"                : "view",
    "ut.visitor_id"           : "015da2e1daf10020914ce74dfaf00207900780700093c",
    "ut.session_id"           : "1522965346545",
    "ut.account"              : "sandbox",
    "ut.profile"              : "main",
    "ut.env"                  : "prod",
    "tealium_event"           : "view",
    "tealium_visitor_id"      : "015da2e1daf10020914ce74dfaf00207900780700093c",
    "tealium_session_id"      : "1522915346545",
    "tealium_datasource"      : "abc123",
    "tealium_account"         : "sandbox",
    "tealium_profile"         : "main",
    "tealium_environment"     : "prod",
    "tealium_random"          : "7421526627003796",
    "tealium_library_name"    : "utag.js",
    "tealium_library_version" : "4.44.0",
    "tealium_timestamp_epoch" : 1522968576,
    "tealium_timestamp_utc"   : "2018-04-05T22:49:36.945Z",
    "tealium_timestamp_local" : "2018-04-05T15:49:36.945"

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This page was last updated: January 7, 2023