E-commerce and faceted navigation SEO

Category and product page patterns, controlling faceted URL explosion, pagination and canonical decisions, out-of-stock handling, and product markup that survives a catalogue change.

Category and product pages

Page	Targets	Must contain
Category	A commercial head term	Unique copy, sorted and filtered product links, internal links to related categories
Subcategory	A more specific commercial term	The same, narrower, plus a link back to the parent
Product	Brand plus model, and the product name	Price, availability, specifications, delivery, reviews, images
Brand page	Brand plus product type	All products from that brand, plus brand context
Guide or buying page	Informational research terms	Comparison, selection advice, links to the products

<!-- the product page needs the offer, the identifiers and the condition -->
<!-- inside a script element with type application/ld+json -->
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Acme 204 replacement filter pack",
  "sku": "FIL-204",
  "gtin13": "5012345678900",
  "mpn": "FIL-204",
  "brand": { "@type": "Brand", "name": "Acme" },
  "offers": {
    "@type": "Offer",
    "url": "https://example.com/p/acme-204-filter-pack",
    "priceCurrency": "GBP",
    "price": "18.99",
    "itemCondition": "https://schema.org/NewCondition",
    "availability": "https://schema.org/InStock",
    "shippingDetails": { "@type": "OfferShippingDetails", "shippingRate": { "@type": "MonetaryAmount", "value": "0", "currency": "GBP" } }
  }
}

A catalogue with six filters of five options each has more than fifteen thousand combinations. Allowing every combination to be crawled and indexed wastes crawl budget, splits signals across near-identical pages and produces endless duplicate content. The decision to make is which facets deserve their own indexable URL.

Facet	Index it?	Reason
Category and subcategory	Yes	Real search demand and a clear shopping intent
Brand within a category	Sometimes	Index when the brand plus category is actually searched
Colour, size, material	No	Low demand, high combination count
Price range	No	Unstable URLs and no stable query demand
Sort order	No	Never indexable; canonicalise to the unsorted URL
Session or tracking parameters	No	Not content; strip or canonicalise

Practical implementation

robots.txt           disallow the combinatorial space you never want crawled
  Disallow: /*?*colour=
  Disallow: /*?*size=
  Disallow: /*?*sort=
  Disallow: /*?*page=*

on indexable filter pages
  <link rel="canonical" href="the canonical URL for that facet landing page" />
  and keep the facet links crawlable only from that landing page

pagination
  self-canonical each page        (do not canonical page 2 to page 1)
  keep the links crawlable        (do not hide them behind a script)
  give the sequence a stable order (never randomise)

Canonicalising every filtered page to the unfiltered category removes the filter pages from the index and is often the right call - but be consistent, because mixing canonicals and robots blocks produces contradictory signals.
robots.txt blocks crawling, not indexing. A blocked URL can still be indexed from links, with no content. Combine the block with a canonical or a noindex where possible.
Never put noindex on a page that is also disallowed in robots.txt - the directive will never be seen.

Stock, variants and closure

Situation	Page treatment	Markup
Temporarily out of stock	Keep the URL, show the expected date	`OutOfStock`
Permanently discontinued	Keep the URL, link to replacements	`Discontinued`, remove the offer
Product replaced by a new model	301 to the new product if it is the same item	New product's markup on the target
Variant differs by size or colour	One page with variants where possible	`Product` plus `hasVariant`
Category emptied	Keep the page with related products	No change
Wholesale URL change	301 the old path to the new	New markup on the target

Keep sold-out product URLs alive. They usually have links, reviews and history that a new URL will not rebuild.
Offer an alternative or a notify-me action on the page rather than letting it become a dead end.
Only redirect a discontinued product when a true replacement exists. Redirecting to a category page is a soft 404 and loses the accumulated value.
Remove the offer from the markup when the product cannot be bought, or you are reporting a price that no longer exists.

💡

In e-commerce, revenue came from pages that already rank. Before building the next category, check the products sitting on positions four to ten - a better specification table, real photography and a stock status that is accurate usually beats another twelve new pages.

FAQ

Should paginated pages be canonicalised to page one?

No. Each page has different products, so self-canonical is correct. Canonicalising page two to page one tells an engine to drop those products, and they will not be found through that path.

How do I handle a catalogue of 100,000 products?

Index the pages that have demand and a unique description, and keep the long tail out of the index but reachable through internal search and category browsing. Crawl budget is finite and mostly wasted on near-duplicates.

Structured data and rich results Technical SEO and measuring it

Last refreshed 2026-09-18.

E-commerce and faceted navigation SEO

Category and product pages

Faceted URLs without an explosion

Stock, variants and closure

FAQ

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