Parse the dimensions of a data URI png / jpeg
$ component install component/datauri-dimensions
var size = require('datauri-dimensions');
var canvas = document.createElement('canvas');
canvas.width = 100;
canvas.height = 150;
var uri = canvas.toDataURL('image/jpeg');
console.log(size(uri));
var uri = canvas.toDataURL('image/png');
console.log(size(uri));
MIT