gtin

gtin

GTIN (UPC, EAN, ITF, etc.) utilities.

npm install gtin

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• gtin.validate(barcode)
• gtin.minify(barcode)
• gtin.getFormat(barcode)
• gtin.getRealFormat(barcode)
• gtin.upce.compress(barcode)
• gtin.upce.expand(barcode)

---

gtin.validate(barcode)

Validates a GTIN (14, 13, 12, or 8-digit) barcode by check digit. Barcode must be a string.

To validate a UPC-E barcode, expand it first: validate(upce.expand('01278906'))

import {validate} from 'gtin'
validate('12341238')       // true
validate('1234123412344')  // true
validate('12341234123413') // true
validate('012000007897')   // true
validate('012000007896')   // false
validate('abc')            // Error thrown
validate(123)              // Error thrown
validate('123')            // Error thrown

gtin.minify(barcode)

Minifies GTIN to smallest possible representation, by stripping as many leading zeroes as possible. Does not compress to UPC-E.

import {minify} from 'gtin'
minify('00000012341238')  // '12341238'
minify('0000012341238')   // '12341238'
minify('01234123412344')  // '1234123412344
minify('001234123412344') // Error thrown
minify('abc')             // Error thrown
minify(123)               // Error thrown
minify('123')             // Error thrown

gtin.getFormat(barcode)

Gets the format of the given barcode. Does not validate checksum.

import {getFormat} from 'gtin'
getFormat('12341238')       // 'GTIN-8'
getFormat('123412341234')   // 'GTIN-12'
getFormat('1234123412344')  // 'GTIN-13'
getFormat('01234123412344') // 'GTIN-14'
getFormat('123412381')      // Error thrown
getFormat('abc')            // Error thrown
getFormat(123)              // Error thrown
getFormat('123')            // Error thrown

gtin.getRealFormat(barcode)

Gets the real format of the given barcode, by minifying it first.

import {getFormat} from 'gtin'
getFormat('1234123412344')  // 'GTIN-13'
getFormat('01234123412344') // 'GTIN-13'
getFormat('123412381')      // Error thrown
getFormat('abc')            // Error thrown
getFormat(123)              // Error thrown
getFormat('123')            // Error thrown

gtin.upce.compress(barcode)

Compress a UPC-A barcode to an 8-digit UPC-E barcode. Does not validate code by check digit. Barcode must be a string.

• 12-digit UPC-A: Number system and check digits are taken into account.
• 11-digit UPC-A: Number system 0 is assumed. Check digit is taken into account.
• 10-digit UPC-A: Number system 0 is assumed. Check digit is generated.

import {upce} from 'gtin'
upce.compress('1200000789')   // '01278907'
upce.compress('12000007897')  // '01278907'
upce.compress('012000007897') // '01278907'
upce.compress('012000007896') // '01278906'
upce.compress('012345678905') // null
upce.compress(123)            // Error thrown
upce.compress('123')          // Error thrown
upce.compress('abc')          // Error thrown

gtin.upce.expand(barcode)

Expands a UPC-E barcode to a 12-digit UPC-A barcode. Does not validate code by check digit. Barcode must be a string.

• 8-digit UPC-E: Number system and check digits are taken into account.
• 7-digit UPC-E: Number system 0 is assumed. Check digit is taken into account.
• 6-digit UPC-E: Number system 0 is assumed. Check digit is generated.

import {upce} from 'gtin'
upce.expand('127890')    // '012000007897'
upce.expand('1278907')   // '012000007897'
upce.expand('01278907')  // '012000007897'
upce.expand('01278906')  // '012000007896'
upce.expand('123412341') // Error thrown
upce.expand(123)         // Error thrown
upce.expand('123')       // Error thrown
upce.expand('abc')       // Error thrown