A query parameter is a piece of data appended to a URL after a question mark, written as a key-value pair like ?color=blue, that tells the receiving page or server how to filter, sort, or customize what it returns without changing the underlying page itself. In feed management and e-commerce, query parameters are commonly used to track which channel or campaign sent a shopper to a product page, or to point a product link at a specific size or color variant of an item.

Why It Matters for Feed Management

Every product link submitted in a feed can carry query parameters that make attribution possible: a utm_source=google_shopping or utm_campaign=summer_sale string appended to the link field lets analytics tools trace a sale back to the exact feed listing that generated the click, separate from organic traffic to the same product page. Without these parameters, a retailer running feeds across five channels would have no reliable way to tell which channel is actually driving conversions on a given product, since the destination URL itself would look identical no matter where the click originated. Query parameters are also how a single product page can serve slightly different content per feed entry — for instance, pre-selecting a specific color swatch so the landing experience matches exactly what the shopper clicked on in the ad.

How It Works

Query parameters follow the pattern ?key=value, with additional pairs joined by an ampersand, as in https://example-shop.com/product/123?color=red&utm_source=meta. The server or client-side script reads these values out of the URL and adjusts its behavior accordingly — showing the red variant, logging the traffic source, or both. Query parameters are technically one category within the broader set of URL parameters, specifically the ones that come after the question mark rather than being built into the path itself. Because they're visible directly in the address bar, they're distinct from data carried in HTTP headers, which travel alongside the request but never appear in the link a shopper sees or shares. Many feed platforms let merchants append a query-parameter template to every product link in bulk, so a consistent tracking structure is applied automatically instead of being added product by product.

Example

<item>
  <g:id>SKU-77302</g:id>
  <title>Leather Crossbody Bag - Cognac</title>
  <link>https://example-shop.com/products/leather-crossbody?color=cognac&amp;utm_source=google_shopping&amp;utm_campaign=fall_launch</link>
  <g:price>89.00 USD</g:price>
</item>

The color, utm_source, and utm_campaign values in this link field are all query parameters — one drives which product variant loads on the page, and the other two let analytics attribute any resulting sale back to this exact feed entry and campaign.

Related Concepts

Query parameters are the most common type of URL parameter used in feed links, and they frequently work alongside a tracking pixel placed on the destination page to confirm whether the click actually converted. Where headers stay invisible to the shopper, query parameters are part of the link itself, which is exactly why they're the tool of choice for attribution that needs to survive being clicked, shared, or opened in a new tab.