Get HTML5 localStorage keys

Question

I'm just wondering how to get all key values in localStorage.

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I have tried to retrieve the values with a simple JavaScript loop

for (var i=1; i <= localStorage.length; i++)  {
   alert(localStorage.getItem(i))
}

But it works only if the keys are progressive numbers, starting at 1.

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How do I get all the keys, in order to display all available data?

Answer 1

for (var key in localStorage){
   console.log(key)
}

EDIT: this answer is getting a lot of upvotes, so I guess it's a common question. I feel like I owe it to anyone who might stumble on my answer and think that it's "right" just because it was accepted to make an update. Truth is, the example above isn't really the right way to do this. The best and safest way is to do it like this:

for ( var i = 0, len = localStorage.length; i < len; ++i ) {
  console.log( localStorage.getItem( localStorage.key( i ) ) );
}