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barcode

barcode generator Build Status

Generate 1D and 2D barcodes

Supported 1D types

Supported 2D types

Requirements

Installing

npm install barcode

Usage

Set it up and specify your type and options. The following 3 are the only required ones.

var barcode = require('barcode');
var code39 = barcode('code39', {
    data: "it works",
    width: 400,
    height: 100,
});

Next choose from the three methods below how you want to output your barcode.

Stream

Get a stream of the final image data. you can collect this and save out a new PNG (default type), pipe it elsewhere, or save it to a CDN.

code39.getStream(function (err, readStream) {
    if (err) throw err;
 
    // 'readStream' is an instance of ReadableStream 
    readStream.pipe(CdnWriteStream);
});

File to disk

Save an image out to the file system, pretty simple. Just be sure to specify your outfile.

var outfile = path.join(__dirname, 'imgs', 'mycode.png')
code39.saveImage(outfile, function (err) {
    if (err) throw err;
 
    console.log('File has been written!');
});

Base64 encoded img src

Often times, barcodes are single use for a single print or whatever. With this method, we can create one on the fly and just send the base64 encoded image to the browser through the HTML.

code39.getBase64(function (err, imgsrc) {
    if (err) throw err;
 
    // if we're using HTTP or another framework 
    res.end('<img src="' + imgsrc + '">');
});

Rewrite

Much of this will be due for a rewrite in the near future. 2.0 might make some API changes, but I will keep it as close to the original as possible.

Some goals for the rewrite:

  • Externalize as much as possible
    • checksum calculations
    • error correcting calculations
  • Abstract the drawing part
    • Allow for the 3 ways to accept the data currently implemented
    • Be able to print numbers below barcodes
  • Break the process up into more defined and testable steps
    • Check for issues with settings
    • Calculate checksums (if applicable)
    • Create pattern in a data structure
    • Send the pattern to the drawer

I hope to eventually make it more maintainable this way instead of the endless amounts of spaghetti code.

License

The MIT License (MIT)