barcode-utils v1.0.1

Barcode Utilities

A collection of utilities for working with barcodes.

Installation

npm install barcode-utils

Usage

const { eanCheckDigit } = require('barcode-utils').default;

const eanWithoutCheckDigit = '001200000013';
const checkDigit = eanCheckDigit(eanWithoutCheckDigit);
console.log(checkDigit); // 3

Documentation

eanCheckDigit

• Calculate the check digit for a EAN code, given the first 7 or 12 digits.
• @param {string} code - The first 7 or 12 digits of a EAN code.
• @returns {number} The check digit for the code.

  const eanWithoutCheckDigit = '001200000013';
  const checkDigit = eanCheckDigit(eanWithoutCheckDigit);
  console.log(checkDigit); // 3

upcCheckDigit

• Calculate the check digit for a UPC code, given the first 7 or 11 digits.
• @param {string} code - The first 7 or 11 digits of a UPC code.
• @returns {number} The check digit for the code.

  const upcWithoutCheckDigit = '72641217542';
  const checkDigit = upcCheckDigit(upcWithoutCheckDigit);
  console.log(checkDigit); // 5

expandupce

• Expand a UPC-E code to a UPC-A code.
• @param {string} code - A UPC-E code.
• @returns {string} The expanded UPC-A code.

  const upce = '01236432';
  const upca = expandupce(upce);
  console.log(upca); // 012300000642

validupce

• Check if a UPC-E code is exactly 8 bytes long, consists of digits only, and has a valid check digit.
• @param {string} code - A UPC-E code.
• @returns {boolean} True if the code is valid, false otherwise.

  const upce = '01236432';
  const valid = validupce(upce);
  console.log(valid); // true

validupca

• Check if a UPC-A code is exactly 12 bytes long, consists of digits only, and has a valid check digit.
• @param {string} code - A UPC-A code.
• @returns {boolean} True if the code is valid, false otherwise.

  const upca = '012300000642';
  const valid = validupca(upca);
  console.log(valid); // true

upca2ean13

• Convert a UPC-A code to a EAN-13 code.
• @param {string} code - A UPC-A code.
• @returns {string} The EAN-13 code.

  const upca = '123456789012';
  const ean13 = upca2ean13(upca);
  console.log(ean13); // 0123456789012

validean13

• Check if a EAN-13 code is exactly 13 bytes long, consists of digits only, and has a valid check digit.
• @param {string} code - A EAN-13 code.
• @returns {boolean} True if the code is valid, false otherwise.

  const ean13 = '0123456789012';
  const valid = validean13(ean13);
  console.log(valid); // true

isBarCode

• Check if a code is a valid UPC-A, UPC-E, or EAN-13 code.
• @param {string} code - A UPC-A, UPC-E, or EAN-13 code.
• @returns {boolean} True if the code is valid, false otherwise.

  const upca = '123456789012';
  const valid = isBarCode(upca);
  console.log(valid); // true