pngcrush

The pngcrush utility as a readable/writable stream

Usage no npm install needed!

<script type="module">
  import pngcrush from 'https://cdn.skypack.dev/pngcrush';
</script>

README

node-pngcrush

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The pngcrush command line utility as a readable/writable stream. This is handy for situations where you don't want to worry about writing the input to disc and reading the output afterwards.

The constructor optionally takes an array of command line options for the pngcrush binary:

var PngCrush = require('pngcrush'),
  myCrusher = new PngCrush(['-res', 300, '-rle']);

sourceStream.pipe(myCrusher).pipe(destinationStream);

PngCrush as a web service (removes all ancillary chunks and does brute force compression):

var PngCrush = require('pngcrush'),
  http = require('http');

http
  .createServer(function (req, res) {
    if (req.headers['content-type'] === 'image/png') {
      res.writeHead(200, { 'Content-Type': 'image/png' });
      req.pipe(new PngCrush(['-brute', '-rem', 'alla'])).pipe(res);
    } else {
      res.writeHead(400);
      res.end('Feed me a PNG!');
    }
  })
  .listen(1337);

Installation

Make sure you have node.js and npm installed, and that the pngcrush binary is in your PATH, then run:

npm install pngcrush

Releases

Changelog

License

3-clause BSD license -- see the LICENSE file for details.