Generate a barcode

Making my own coles gift card tracker app, I needed to generate a barcode programmatically. I needed what Stocard generates which was found to be 'code128'. This barcode class is also the default in JsBarcode for javascript.

With Python


pip install python-barcode
from barcode.base import Barcode import barcode def generate_barcode(number, filename): Barcode.default_writer_options["write_text"] = False CODE128 = barcode.get_barcode_class("code128") my_code = CODE128(number) my_code.save(filename)

Above python code generates barcode image in SVG in the current directory.

e.g. my_code.save('barcode1') -> creates barcode1.svg

If you don't know which barcode class to use, just generate all barcodes provided and compare to find it like below.

def _find_which_barcode_class(number): barcodes = barcode.PROVIDED_BARCODES # ['codabar', # 'code128', # 'code39', # 'ean', # 'ean13', # 'ean13-guard', # 'ean14', # 'ean8', # 'ean8-guard', # 'gs1', # 'gs1_128', # 'gtin', # 'isbn', # 'isbn10', # 'isbn13', # 'issn', # 'itf', # 'jan', # 'nw-7', # 'pzn', # 'upc', # 'upca'] for code in barcodes: try: classname = barcode.get_barcode_class(code) my = classname(number) my.save(f"barcode_{code}") except: pass

With Javascript


<svg id="barcode"></svg> <script src="https://cdnjs.cloudflare.com/ajax/libs/jsbarcode/3.11.5/barcodes/JsBarcode.code128.min.js"></script>
JsBarcode("#barcode", "1234567890", {format: "CODE128", displayValue: false});

First, I tried to generate a barcode in django with above python code. This required extra field in the django model to track barcode file, and worse I had to deal with static/media files. This happened to be non-trivial.

As barcode can be easily generated on the frontend. I switched to generate with javascript code inside the django template.