What Is a SKU, and Is It Actually Required in WooCommerce?
Why SKUs Matter Beyond WooCommerce Itself
WooCommerce's internal database ID uniquely identifies every product regardless of whether a SKU is set, so technically, sales can proceed without one. The SKU's real value is as a human-meaningful, business-controlled identifier that can align across multiple systems — the same product might be referenced by its SKU in a warehouse management system, an accounting platform, and a supplier's own catalog, all needing to match up consistently.
Why Skipping SKUs Causes Problems Later
- Inventory reconciliation with a physical warehouse or a supplier becomes much harder without a consistent SKU to match records against, relying instead on product names that can vary in formatting.
- Many reporting and analytics tools, including some built into WooCommerce extensions, use SKU as the primary product reference in exports and reports, which is less useful without one set.
- Third-party integrations (accounting software, a POS system, a marketplace sync) very commonly require SKUs to match products correctly across systems, making this close to a hard requirement in practice even though WooCommerce itself doesn't enforce it.
- SKUs need to be unique across the store (WooCommerce enforces this if set), so a consistent naming convention established early prevents confusion as the catalog grows.
Setting Up SKUs Properly
- Establish a consistent SKU naming convention before the catalog grows large, ideally aligned with any external system already in use.
- Set a SKU for every product and variation going forward, even if not strictly required by WooCommerce itself.
- Retroactively add SKUs to existing products lacking them, via bulk edit or a CSV import, if the catalog has grown without this discipline.
Need help establishing a proper SKU system across your catalog? See custom WooCommerce development.