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    <p><strong>EDIT</strong> I also created a npm module, which can be found on <a href="https://github.com/dominiklessel/barcoder">github</a>.</p> <p>I created a small library, which supports EAN8, EAN12, EAN13, EAN14, EAN18, GTIN12, GTIN13 and GTIN14.</p> <p>It works inside node.js and all modern browsers.</p> <p><strong>barcoder.js:</strong></p> <pre><code>/*! * Barcoder * Copyright (c) 2013 mifitto GmbH &lt;dominik@mifitto.com&gt; * MIT Licensed */ (function() { 'use strict'; /** * Library version. */ var version = '1.1.0'; /** * Supported formats */ var minValidLength = 6; var maxValidLength = 18; var usualValidChars = /^\d+$/; var formats = { 'ean8' : { validChars : /^\d+$/, validLength : 8 }, 'ean12' : { validChars : /^\d+$/, validLength : 12 }, 'ean13' : { validChars : /^\d+$/, validLength : 13 }, 'ean14' : { validChars : /^\d+$/, validLength : 14 }, 'ean18' : { validChars : /^\d+$/, validLength : 18 }, 'gtin12' : { validChars : /^\d+$/, validLength : 12 }, 'gtin13' : { validChars : /^\d+$/, validLength : 13 }, 'gtin14' : { validChars : /^\d+$/, validLength : 14 } }; /** * Validates the checksum (Modulo 10) * GTIN implementation factor 3 * * @param {String} value The barcode to validate * @return {Boolean} * @api private */ var validateGtin = function( value ) { var barcode = value.substring( 0, value.length - 1 ); var checksum = parseInt( value.substring( value.length - 1 ), 10 ); var calcSum = 0; var calcChecksum = 0; barcode.split('').map(function( number, index ) { number = parseInt( number, 10 ); if ( value.length % 2 === 0 ) { index += 1; } if ( index % 2 === 0 ) { calcSum += number; } else { calcSum += number * 3; } }); calcSum %= 10; calcChecksum = (calcSum === 0) ? 0 : (10 - calcSum); if ( calcChecksum !== checksum ) { return false; } return true; }; /** * Barcoder class * * @param {string} format See formats * @param {Object} options Valid option `enableZeroPadding`, defaults to `true` * @api public */ var Barcoder = function ( format, options ) { if ( format &amp;&amp; !formats[format] ) throw new Error( '"format" invalid' ); this.format = (format) ? formats[format] : 'autoSelect'; this.options = (options) ? options : { enableZeroPadding : true }; if ( !this.options.enableZeroPadding ) { this.options.enableZeroPadding = true; } }; /** * Validates a barcode * * @param {string} barcode EAN/GTIN barcode * @return {Boolean} * @api public */ Barcoder.prototype.validate = function( barcode ) { var self = this; if ( self.format === 'autoSelect' ) { if ( barcode.length &lt; minValidLength || barcode.length &gt; maxValidLength ) { return false; } var isValidGtin = validateGtin( barcode ); var paddedBarcode = barcode; var successfullyPadded = false; if ( !isValidGtin ) { var possiblyMissingZeros = maxValidLength - barcode.length; while( possiblyMissingZeros-- ) { paddedBarcode = '0' + paddedBarcode; if ( validateGtin( paddedBarcode ) ) { isValidGtin = true; successfullyPadded = true; break; } } } return { possibleType: (barcode.length &gt; 8) ? 'GTIN' + barcode.length : 'EAN8 / padded GTIN', isValid: isValidGtin }; } var validChars = self.format.validChars; var validLength = self.format.validLength; var enableZeroPadding = self.options.enableZeroPadding; if ( validChars.exec( barcode ) === null ) { return false; } if ( enableZeroPadding &amp;&amp; barcode.length &lt; validLength ) { var missingZeros = validLength - barcode.length; while( missingZeros-- ) { barcode = '0' + barcode; } } else if ( !enableZeroPadding &amp;&amp; barcode.length != validLength ) { return false; } else if ( barcode.length &gt; validLength ) { return false; } return validateGtin( barcode ); }; /** * Export */ if ( 'undefined' !== typeof module &amp;&amp; module.exports ) { module.exports = Barcoder; exports.version = version; } if ( 'undefined' === typeof ender ) { this['Barcoder'] = Barcoder; } if ( 'function' === typeof define &amp;&amp; define.amd ) { define('Barcoder', [], function () { return Barcoder; }); } }).call( this ); </code></pre> <p><strong>Installation:</strong></p> <pre><code>$ npm install barcoder </code></pre> <p><strong>Usage:</strong></p> <pre><code>var Barcoder = require('barcoder'); var ean1 = '0016T20054453'; var ean2 = '9330071314999'; var validator = new Barcoder('ean13'); console.log( '%s ean1 is valid: %s', ean1, validator.validate( ean1 ) ); console.log( '%s ean2 is valid: %s', ean1, validator.validate( ean2 ) ); // or /w automatic type selection validator = new Barcoder(); var validation1 = validator.validate( ean1 ); var validation2 = validator.validate( ean2 ); console.log( '%s is valid: %s and has guessed type: %s', ean1, validation1.isValid, validation1.possibleType ); console.log( '%s is valid: %s and has guessed type: %s', ean2, validation2.isValid, validation2.possibleType ); </code></pre>
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