console.save.js

(function(console) {

	console.save = function(data, filename) {

		if (!data) {
			console.error('Console.save: No data')
			return;
		}

		if (!filename) filename = 'console.json'

		if (typeof data === "object") {
			data = JSON.stringify(data, undefined, 4)
		}

		var blob = new Blob([data], {
				type: 'text/json'
			}),
			e = document.createEvent('MouseEvents'),
			a = document.createElement('a')

		a.download = filename
		a.href = window.URL.createObjectURL(blob)
		a.dataset.downloadurl = ['text/json', a.download, a.href].join(':')
		e.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null)
		a.dispatchEvent(e)
	}
})(console);

console.save(localStorage.jsnapshot, 'data.txt')