How can I get a list of the items stored in html 5 local storage from javascript?

you can use Object.assign():

var data = Object.assign({}, localStorage)

From HTML5 reference:

Like other JavaScript objects, you can treat the localStorage object as an associative array. Instead of using the getItem() and setItem() methods, you can simply use square brackets.

localStorage.setItem('test', 'testing 1');
localStorage.setItem('test2', 'testing 2');
localStorage.setItem('test3', 'testing 3');

for(var i in localStorage)
{
    console.log(localStorage[i]);
}

//test for firefox 3.6 see if it works
//with this way of iterating it
for(var i=0, len=localStorage.length; i<len; i++) {
    var key = localStorage.key(i);
    var value = localStorage[key];
    console.log(key + " => " + value);
}

This will output:

testing 3
testing 2
testing 1

test3 => testing 3
test2 => testing 2
test => testing 1

Here is the JSFiddle Demo

localStorage is reference to object window.Storage, so u can use it as each other object:

Get array of items

Object.keys(localStorage)

Get length

Object.keys(localStorage).length

Iterate with jquery

$.each(localStorage, function(key, value){
   .....
})