A 404 on /products.json usually comes down to one of a few things: the store has closed or changed its domain, the URL was typed slightly wrong (check for a stray path or subdomain), or - less commonly - the storefront’s theme or region-specific setup blocks that exact path.

One thing worth trying manually: some stores serve products from a collection-scoped path like /collections/all/products.json instead of the bare root. This tool doesn’t attempt that automatically, since it isn’t a reliable pattern across stores, but it’s worth a quick manual check in your browser if the plain URL 404s.

If the store uses a locale prefix in its URLs (like /en-gb/), the tool already retries with that prefix automatically before giving up.

If none of that explains it, the simplest next check is opening the store’s homepage directly in a browser - if that also fails to load, the issue is the store itself being unavailable or closed, not anything specific to the products feed or this tool.