LibreBarcode Fonts and Encoders

This project provides two encoders for the Code128 and EAN fonts developed by the LibreBarcode project.

• Code128
• EAN-13, UPC/A and EAN-8
• EAN/GS-1 Checksums
• Font Assets
• License (encoders)
• License (fonts)

Code128

The code128() encoder takes a string (the barcode to be encoded) and returns a string that can be fed to the Code128 font to correctly display the barcode.

It attempts to calculate the shortest possible barcode given the input, and supports encoding of all 128 characters in the US-ASCII range, plus support for the Code128 specific FNC1, FNC2, FNC3 and FNC4 characters.

Control characters can be entered directly in the string to encode using their JavaScript equivalent (e.g. \n for newline, \x1D for the group separator) and the four speial characters \uf001, \uf002, \uf003, \uf004, can be used to encode FNC1, FNC2, FNC3 and FNC4 respectively.

Those are also exported by the library as FNC1, FNC2, FNC3 and FNC4.

import { FNC1, code128 } from '@juit/librebarcode'

const gs1 =
  FNC1 + // FNC1 indicates this is a standard "GS1" barcode
  '02' + // application identifier "02": Identification of trade items
  '05411361083574' + // Ardo Spring Onions, 250g
  '15' + // application identifier "15": Best before date (YYMMDD)
  '250929' + // Expires 29.09.2025
  '37' + // application identifier "37": Count of trade items
  '144' // Contains 144 packages

const encoded = code128(gs1)
// now you can feed the "encoded" string to the font!

Encoding with a specific code set

In certain cases, where a specific code set of Code128 is required for a barcode (for example labeling products for the Amazon Marketplace, requiring codeset "A"), there might be the need to forego the "shortest path" algorithm provided by code128() and specify the code set directly.

In this case, an extra parameter to code128() can be added to the call:

import { code128 } from '@juit/librebarcode'

const a = code128('ABCD', 'A') // this will be constrained to code set "A"
const b = code128('abcd', 'B') // this will be constrained to code set "B"
const b = code128('1234', 'C') // this will be constrained to code set "C"

EAN-13, UPC/A, EAN-8

Similarly to Code128, but for EAN the ean() encoder takes a string of digits and produces a a string that can be fed to the EAN font to correctly display the barcode.

The string to encode should have one of the following lengths:

• 13 digits: standard EAN-13 barcode
• 12 digits: standard UPC/A barcode
• 8 digits: standard EAN-8 barcode

The encoder also supports the standard 2-digits and 5-digits supplemental barcodes and the lengths will then become:

• 18 digits: standard EAN-13 barcode with 5-digits supplemental barcode
• 17 digits: standard UPC/A barcode with 5-digits supplemental barcode
• 15 digits: standard EAN-13 barcode with 2-digits supplemental barcode
• 12 digits: standard UPC/A barcode with 2-digits supplemental barcode
• 5 digits: only the 5-digits supplemental barcode
• 2 digits: only the 2-digits supplemental barcode

import { ean } from '@juit/librebarcode'

const encoded = ean('5411361083574') // EAN-13 barcode for Ardo Spring Onions
// now you can feed the "encoded" string to the font!

EAN/GS-1 Checksums

Unlike the "compatible" EAN-13 encoder developed and provided by the LibreBarcode project, this library doesn't try to calculate the EAN-13 checksum while encoding strings.

A separate function checksum() can be used to calculate the checksum for an arbitrary sequence of digits according to the EAN/GS-1 calculation rules:

import { ean } from '@juit/librebarcode'

const checksum = ean('541136108357')
// here checksum will be the number 4

Font Assets

Embedded with this library, you can find three fonts for your encoding needs:

• ./assets/LibreBarcode128-Regular.ttf: the regular Code128 font without any underlying text. Use this one for GS1 barcodes, as encoding of the FNC1 character messes up the text, and anyhow the text should be represented as (xx)yyyyyyyyyy(zz)wwwwwwww... (application identifiers with parentheses).
• ./assets/LibreBarcode128Text-Regular.ttf: the Code128 font with underlying text. Use this one for standard Code128 barcodes.
• ./assets/LibreBarcodeEAN13Text-Regular.ttf: the EAN font.

You can find their file locations in the fonts export:

import { fonts } from '@juit/librebarcode'

// Here fonts will look somewhat similar to
// {
//   'LibreBarcode128-Regular.ttf': '... path on your disk .../LibreBarcode128-Regular.ttf',
//   'LibreBarcode128Text-Regular.ttf': '... path on your disk .../LibreBarcode128Text-Regular.ttf',
//   'LibreBarcodeEAN13Text-Regular.ttf': '... path on your disk .../LibreBarcodeEAN13Text-Regular.ttf'
// }