In this video I show you the absolute best way to create a single item product array in Google Tag Manager using a Custom JavaScript variable—without any developer help. I’m doing this for a real client website where I already scraped the product data like product name, price, currency, and item ID. If you don’t know the scraping method yet, I mentioned that I’m sharing the related link in the description so you can collect those values first. Then inside GTM, I create a new Custom JavaScript variable and build the array using the GA4 items schema. I add item_name (from my scraped product name variable), item_id (from my content ID variable), price (from my scraped product price), and quantity (I set it as 1 because it’s a single product page and there’s no quantity selector). After saving, I test everything in GTM Preview/Tag Assistant and confirm the variable is returning the correct array format. Once you have this array, you can reuse it for tracking setups like GA4 ecommerce, Meta CAPI, TikTok Pixel, and dynamic remarketing—clean and simple.