Deprecated in favor of xbpf/gtin.

which-gtin

Determine what GTIN format the code is, what its real format is, and if it valid or not. Supports UPC-E (number systems 0 and 1).

whichGTIN(code, upce): Determine which GTIN format the code is in.

• code: Code to check. Can be either a string or a number.
  • warning: Be careful using plain numbers! If you input 0123, it will be interpreted as "123". Use strings if you want to be safe.
• upce: Whether to check if an 8-digit code is a UPC-E or a GTIN-8 code.
  • Only applies if the code given is exactly 8 digits long.
    • Even if true, if the code is padded with zeroes, e.g. 00000032435887, the function will assume and validate for GTIN-8.
  • If the code is valid UPC-E, then the returned object will have the property expanded, which will contain the expanded GTIN-12 string for the UPC-E code.

Returns an object that follows this format:

{
    format: 'GTIN-14',
    real: 'GTIN-8',
    valid: true,
    expanded: null
}

• format: The given format. Determined from the code length.
  • "GTIN-14", "GTIN-13", "GTIN-12", "GTIN-8": Code is 14, 13, 12, 8 digits long, respectively.
    • GTIN-14 = ITF-14
    • GTIN-13 = EAN = EAN-13
    • GTIN-12 = UPC = UPC-A
    • GTIN-8 = EAN-8
  • "UPC-E": Code is 8 digits long, and the upce argument is true.
  • null: Code is of an invalid format.
• real: The interpreted format.
  • Can be one of the format values.
  • If given code is 00000032435887, the format is GTIN-14, but real is GTIN-8.
• valid: Whether the checksum is valid.
• expanded: GTIN-12 code expanded from the given UPC-E code.
  • Only applies if format is 'UPC-E'.
  • note: The expanded UPC-A code can be a GTIN-8 code. If you want to be 100% accurate, run the expanded value through the function again.

import whichGTIN from 'which-gtin'

whichGTIN('00000032435887', true)
// {format: 'GTIN-14', real: 'GTIN-8', valid: true, expanded: null}

whichGTIN('123')
// {format: null, real: null, valid: false, expanded: null}

whichGTIN('32435887', false)
// {format: `GTIN-8`, real: `GTIN-8`, valid: true, expanded: null}