Folksonomy API currently recognize products with the following regexp: [0-9]{1,13} which means barcodes containing 1 to 13 digits.

More than 12,000 products have barcodes bigger than that. Eg. https://world.openfoodfacts.org/product/70238541220839/ikea (even if it's not a food product, it is a real barcode).

This topic is relevant because Folksonomy Engine could be use for other kind of products, nit just food. And these other kind of products sometimes have different barcodes than classical EAN13 barcodes.

To extract the barcodes with more than 13 digits:
zcat openfoodfacts-products.jsonl.gz | jq -r '. | select(.code|test("^[0-9]{1,13}$") | not) | .code'

See also:

• https://wiki.openfoodfacts.org/Barcodes
• https://world.openfoodfacts.org/codes