asset-url

var assetUrl = require('asset-url');

assetUrl.getCanonical('http://assets.example.com/:imgId/:options', {
    imgId: 1337,
    options: {
        bw: true
        w: 100,
        blur: 10,
        h: 200
    }
});

// Returns
'http://assets.example.com/1337/blur10,bw,h200,w100'

assetUrl.parseOptions('blur10,bw,h200,w100');

// Returns
{
    bw: true
    w: 100,
    blur: 10,
    h: 200
}