{"id":74845,"date":"2025-02-08T02:08:07","date_gmt":"2025-02-08T02:08:07","guid":{"rendered":"https:\/\/peraltafinancing.com\/analytics\/gtmtips-write-client-id-and-other-gtag-fields-into-datalayer\/"},"modified":"2025-02-08T02:08:07","modified_gmt":"2025-02-08T02:08:07","slug":"gtmtips-write-client-id-and-other-gtag-fields-into-datalayer","status":"publish","type":"post","link":"https:\/\/fivemor.com\/?p=74845","title":{"rendered":"#GTMTips: Write Client ID And Other GTAG Fields Into dataLayer"},"content":{"rendered":"<p> <br \/>\n<\/p>\n<div>\n<p>One of the big omissions, at least for now, in <a href=\"https:\/\/support.google.com\/analytics\/answer\/10089681\">Google Analytics 4<\/a> is the <a href=\"https:\/\/www.simoahava.com\/analytics\/customtask-the-guide\/\"><code>customTask<\/code><\/a>. It is unfortunate, but no such mechanism exists in the client-side SDKs.<\/p>\n<p>This means that you won\u2019t be able to do all the magical things that <a href=\"https:\/\/www.simoahava.com\/tools\/customtask-builder\/\"><code>customTask<\/code> enables in Universal Analytics<\/a>. One of the biggest headaches is how to collect extremely useful fields such as the Client ID, as these are <em>not<\/em> available by default in the Google Analytics 4 reporting interface.<\/p>\n<p>Well, with a <a href=\"https:\/\/www.simoahava.com\/custom-templates\/gtag-get-api\/\">new custom tag template<\/a> you can now fetch these values from GTAG, write them into <code>dataLayer<\/code>, and utilize them in Google Analytics 4 as custom parameters, for example.<\/p>\n<p>It\u2019s not as easy to pull off as it was with <code>customTask<\/code>, but it does give you an additional bonus: since the data is written into <code>dataLayer<\/code>, it can be used with other tags as well and not just Google\u2019s scripts.<\/p>\n<p>                <span class=\"simmer\"><br \/>\n  <span class=\"close\">X<\/span><\/p>\n<p>\n    <span class=\"fa fa-md fa-bell\"\/><br \/>\n    <strong>The Simmer Newsletter<\/strong>\n  <\/p>\n<p>\n    Subscribe to the <a href=\"https:\/\/www.simoahava.com\/newsletter\/\">Simmer newsletter<\/a> to get the latest news and content from Simo Ahava into your email inbox!\n  <\/p>\n<p>  <\/span><\/p>\n<h2 id=\"tip-121-write-the-client-id-and-other-gtag-fields-into-datalayer\">Tip 121: Write the Client ID and other GTAG fields into dataLayer<\/h2>\n<div style=\"aspect-ratio: 960 \/ 540;\" class=\"figure nocaption\">\n<p>    <a href=\"https:\/\/www.simoahava.com\/images\/2020\/12\/write-client-id-other-gtag-fields-datalayer.jpg\" title=\"Write Client ID and other GTAG fields into dataLayer\"><\/p>\n<p>    <img decoding=\"async\" class=\"fig-img\" height=\"540\" width=\"960\" loading=\"lazy\" src=\"https:\/\/www.simoahava.com\/images\/2020\/12\/write-client-id-other-gtag-fields-datalayer.jpg#ZgotmplZ\" alt=\"Write Client ID and other GTAG fields into dataLayer\"\/><\/p>\n<p>    <\/a><\/p>\n<\/div>\n<blockquote>\n<p>For any of this to work, you <strong>must<\/strong> have Google Analytics 4 (or Ads \/ Floodlight) collection implemented on the page, preferably via Google Tag Manager using the default templates.<\/p>\n<\/blockquote>\n<h3 id=\"fetch-the-template-and-create-a-tag\">Fetch the template and create a tag<\/h3>\n<p>First, go to <strong>Templates<\/strong> in the Google Tag Manager UI, and search for <code>GTAG GET API<\/code> in the <a href=\"https:\/\/tagmanager.google.com\/gallery\/#\/\">template gallery<\/a>. Once you find the template, click <strong>Add to workspace<\/strong> to install the template.<\/p>\n<p>Next, go to <strong>Tags<\/strong> and create a new tag. Use the <code>GTAG GET API<\/code> template as the tag type. This is what you should see on the screen now:<\/p>\n<div style=\"aspect-ratio: 1778 \/ 934;\" class=\"figure nocaption\">\n<p>    <a href=\"https:\/\/www.simoahava.com\/images\/2020\/12\/base-example-gtag-get-api.jpg\" title=\"GTAG GET API default settings\"><\/p>\n<p>    <img decoding=\"async\" class=\"fig-img\" height=\"934\" width=\"1778\" loading=\"lazy\" src=\"https:\/\/www.simoahava.com\/images\/2020\/12\/base-example-gtag-get-api.jpg#ZgotmplZ\" alt=\"GTAG GET API default settings\"\/><\/p>\n<p>    <\/a><\/p>\n<\/div>\n<h3 id=\"configure-the-tag\">Configure the tag<\/h3>\n<p>Set the <strong>GA4 Measurement ID<\/strong> in the appropriate field. If you want to collect GCLID for Ads or Floodlight tags, use the relevant measurement ID instead.<\/p>\n<p>Next, select the fields whose values will be fetched. <strong>Client ID<\/strong> (the unique browser identifier that GA4 uses) is a no-brainer, and even though Session ID is collected automatically to GA4, you might still want to send it to other vendors.<\/p>\n<p>If you\u2019ve set <strong>custom<\/strong> fields using the Fields to Set option in your Configuration tag, you can also add those fields into the <strong>Custom Fields To Get<\/strong> table.<\/p>\n<p>This is what a configured tag might look like:<\/p>\n<div style=\"aspect-ratio: 1794 \/ 1030;\" class=\"figure nocaption\">\n<p>    <a href=\"https:\/\/www.simoahava.com\/images\/2020\/12\/gtag-api-configured.jpg\" title=\"GTAG API template\"><\/p>\n<p>    <img decoding=\"async\" class=\"fig-img\" height=\"1030\" width=\"1794\" loading=\"lazy\" src=\"https:\/\/www.simoahava.com\/images\/2020\/12\/gtag-api-configured.jpg#ZgotmplZ\" alt=\"GTAG API template\"\/><\/p>\n<p>    <\/a><\/p>\n<\/div>\n<h3 id=\"create-the-tag-sequence\">Create the tag sequence<\/h3>\n<p>Next, <strong>and this is important<\/strong>, you need to add this tag in a <a href=\"https:\/\/www.simoahava.com\/analytics\/understanding-tag-sequencing-in-google-tag-manager\/\">tag sequence<\/a>, so that it fires <strong>after<\/strong> your <strong>GA4 Configuration tag<\/strong> (or Event tag, if you\u2019re not using the Configuration tag).<\/p>\n<blockquote>\n<p>It\u2019s absolutely vital you do it this way. It\u2019s the only way you ensure that the API is ready to accept requests.<\/p>\n<\/blockquote>\n<p>To add the tag in the sequence, open your <strong>Google Analytics 4: Configuration<\/strong> tag, and scroll to <strong>Advanced Settings<\/strong> -&gt; <strong>Tag Sequencing<\/strong>.<\/p>\n<p>Check the box next to <strong>Fire a tag after \u2026 fires<\/strong>, and select the tag you created from the custom template in the drop-down list. This is what it would look like:<\/p>\n<div style=\"aspect-ratio: 1366 \/ 1004;\" class=\"figure nocaption\">\n<p>    <a href=\"https:\/\/www.simoahava.com\/images\/2020\/12\/gtag-tag-sequencing.jpg\" title=\"gtag tag sequencing\"><\/p>\n<p>    <img decoding=\"async\" class=\"fig-img\" height=\"1004\" width=\"1366\" loading=\"lazy\" src=\"https:\/\/www.simoahava.com\/images\/2020\/12\/gtag-tag-sequencing.jpg#ZgotmplZ\" alt=\"gtag tag sequencing\"\/><\/p>\n<p>    <\/a><\/p>\n<\/div>\n<p>By using a tag sequence, you\u2019re ensuring that the API isn\u2019t called until after <code>gtag()<\/code> has loaded and initialized on the page.<\/p>\n<h3 id=\"test\">Test<\/h3>\n<p>If you now go to Preview mode and test your setup, you should see a new Data Layer event named <code>gtagApiGet<\/code> in the event list.<\/p>\n<div style=\"aspect-ratio: 2072 \/ 454;\" class=\"figure nocaption\">\n<p>    <a href=\"https:\/\/www.simoahava.com\/images\/2020\/12\/gtag-api-get-preview.jpg\" title=\"GTAG API GET preview\"><\/p>\n<p>    <img decoding=\"async\" class=\"fig-img\" height=\"454\" width=\"2072\" loading=\"lazy\" src=\"https:\/\/www.simoahava.com\/images\/2020\/12\/gtag-api-get-preview.jpg#ZgotmplZ\" alt=\"GTAG API GET preview\"\/><\/p>\n<p>    <\/a><\/p>\n<\/div>\n<p>If you don\u2019t see it, it\u2019s most likely because you don\u2019t have a GA4 configuration on the page, or it\u2019s because the API tag fired before <code>gtag()<\/code> had time to load.<\/p>\n<h3 id=\"create-the-trigger-and-variables\">Create the trigger and variables<\/h3>\n<p>To make use of this information, you need to create a Custom Event trigger for the <code>gtagApiGet<\/code> event as well as Data Layer variables for each of the fields whose value you want to utilize.<\/p>\n<div style=\"aspect-ratio: 914 \/ 426;\" class=\"figure \">\n<p>    <a href=\"https:\/\/www.simoahava.com\/images\/2020\/12\/event-trigger-gtagapiget.jpg\" title=\"Custom Event trigger for gtagApiGet\"><\/p>\n<p>    <img decoding=\"async\" class=\"fig-img\" height=\"426\" width=\"914\" loading=\"lazy\" src=\"https:\/\/www.simoahava.com\/images\/2020\/12\/event-trigger-gtagapiget.jpg#ZgotmplZ\" alt=\"Custom Event trigger for gtagApiGet\"\/><\/p>\n<p>    <\/a><\/p>\n<p>    <span class=\"caption\">Custom Event trigger for gtagApiGet<\/span><\/p>\n<\/div>\n<div style=\"aspect-ratio: 900 \/ 632;\" class=\"figure \">\n<p>    <a href=\"https:\/\/www.simoahava.com\/images\/2020\/12\/data-layer-variable-client-id.jpg\" title=\"Data Layer variable for gtagApiResult.client_id\"><\/p>\n<p>    <img decoding=\"async\" class=\"fig-img\" height=\"632\" width=\"900\" loading=\"lazy\" src=\"https:\/\/www.simoahava.com\/images\/2020\/12\/data-layer-variable-client-id.jpg#ZgotmplZ\" alt=\"Data Layer variable for gtagApiResult.client_id\"\/><\/p>\n<p>    <\/a><\/p>\n<p>    <span class=\"caption\">Data Layer variable for gtagApiResult.client_id<\/span><\/p>\n<\/div>\n<h3 id=\"create-a-new-google-analytics-4-event-tag\">Create a new Google Analytics 4 event tag<\/h3>\n<p>Finally, if you want to send these values to Google Analytics 4, you can. You need to choose whether to use a user property or custom event dimensions. For user-scoped fields such as the Client ID, the former makes more sense, and for event-specific fields the latter might be more useful.<\/p>\n<p>Unfortunately, GA4 in all its wisdom forces any numerical fields to be converted into number types, so a Client ID is rewritten as a <strong>double<\/strong>. This means it becomes illegible as there are too many decimals and the result is truncated.<\/p>\n<p>I\u2019ve solved this for now by adding a simple <code>.<\/code> at the end of the Client ID in the event tag itself (see below). This is easy enough to overlook in the reports or clean up in the <a href=\"https:\/\/support.google.com\/analytics\/answer\/9358801?hl=en\">BigQuery export<\/a>. If you have another solution for this, please add it to the comments of this article!<\/p>\n<p>This is what a finalized event tag might look like:<\/p>\n<div style=\"aspect-ratio: 1800 \/ 1380;\" class=\"figure nocaption\">\n<p>    <a href=\"https:\/\/www.simoahava.com\/images\/2020\/12\/ga4-fields-event-tag.jpg\" title=\"GA4 event tag\"><\/p>\n<p>    <img decoding=\"async\" class=\"fig-img\" height=\"1380\" width=\"1800\" loading=\"lazy\" src=\"https:\/\/www.simoahava.com\/images\/2020\/12\/ga4-fields-event-tag.jpg#ZgotmplZ\" alt=\"GA4 event tag\"\/><\/p>\n<p>    <\/a><\/p>\n<\/div>\n<p>You can always utilize <a href=\"https:\/\/ken-williams.com\/guide\/installation\/validating-google-analytics-4-with-debug-mode\/\">DebugView<\/a> to validate the setup.<\/p>\n<div style=\"aspect-ratio: 1360 \/ 618;\" class=\"figure nocaption\">\n<p>    <a href=\"https:\/\/www.simoahava.com\/images\/2020\/12\/debugview.jpg\" title=\"DebugView\"><\/p>\n<p>    <img decoding=\"async\" class=\"fig-img\" height=\"618\" width=\"1360\" loading=\"lazy\" src=\"https:\/\/www.simoahava.com\/images\/2020\/12\/debugview.jpg#ZgotmplZ\" alt=\"DebugView\"\/><\/p>\n<p>    <\/a><\/p>\n<\/div>\n<p>As you can see, the little <code>.<\/code> at the end of the Client ID is there to make sure GA4 doesn\u2019t convert this string into a number.<\/p>\n<h2 id=\"summary\">Summary<\/h2>\n<p>I miss <code>customTask<\/code>. So much. I really hope Google will introduce something similar to <code>gtag()<\/code>, but I\u2019m not optimistic. Thus far <em>many<\/em> of the things we\u2019ve previously done in the client have been moved to the Google Analytics 4 admin (<a href=\"https:\/\/www.charlesfarina.com\/cross-domain-tracking-google-analytics-4\/\">cross-domain tracking<\/a>, for example).<\/p>\n<p>I get the feeling that Google wants to simplify the implementation part as much as possible, which makes a lot of sense. But it wouldn\u2019t <em>hurt<\/em> to have customization options for power users.<\/p>\n<p>In this article I showed you how to fetch GA4-specific fields using an API of <code>gtag()<\/code>. The API itself is a bit awkward to use as it\u2019s asynchronous. This means that it won\u2019t work in a variable as variables rely on synchronous execution.<\/p>\n<p>The silver lining is that the data is now available in <code>dataLayer<\/code> for all your tags, and not just those running on the Google stack.<\/p>\n<p>I hope you found this useful &#8211; please let me know in the comments if there\u2019s something unclear about how the template or the <code>.get()<\/code> API works!<\/p>\n<\/p><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>One of the big omissions, at least for now, in Google Analytics 4 is the customTask. It is unfortunate, but no such mechanism exists in the client-side SDKs. This means that you won\u2019t be able to do all the magical things that customTask enables in Universal Analytics. One of the biggest headaches is how to [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":74846,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12033],"tags":[12982,38540,16121,38539,14492,4012],"dealstore":[],"offerexpiration":[],"class_list":["post-74845","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analytics","tag-client","tag-datalayer","tag-fields","tag-gtag","tag-gtmtips","tag-write"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>#GTMTips: Write Client ID And Other GTAG Fields Into dataLayer - Som2ny Network<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fivemor.com\/?p=74845\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#GTMTips: Write Client ID And Other GTAG Fields Into dataLayer - Som2ny Network\" \/>\n<meta property=\"og:description\" content=\"One of the big omissions, at least for now, in Google Analytics 4 is the customTask. 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