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The key() method of the Storage interface, when passed a number n, returns the name of the nth key in the storage. The order of keys is user-agent defined, so you should not rely on it.

Syntax

var aKeyName = storage.key(key);

Parameters

key
An integer representing the number of the key you want to get the name of. This is a zero-based index.

Return value

A DOMString containing the name of the key.

Examples

The following function iterates over the local storage keys:

function forEachKey(callback) {
  for (var i = 0; i < localStorage.length; i++) {
    callback(localStorage.key(i));
  }
}

The following function iterates over the local storage keys and gets the value set for each key:

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

Note: For a real world example, see our Web Storage Demo.

Specifications

Specification Status Comment
Web Storage (Second edition)
The definition of 'key()' in that specification.
Recommendation  

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
localStorage 4 (Yes) 3.5 8 10.50 4
sessionStorage 5 ? 2 8 10.50 4
Feature Android Edge Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support 2.1 (Yes) ? 8 11 iOS 3.2

All browsers have varying capacity levels for both localStorage and sessionStorage. Here is a detailed rundown of all the storage capacities for various browsers.

Note: since iOS 5.1, Safari Mobile stores localStorage data in the cache folder, which is subject to occasional clean up, at the behest of the OS, typically if space is short.

See also

Using the Web Storage API

Document Tags and Contributors

 Contributors to this page: chrisdavidmills, abbycar, shakeelosmani, rolfedh, sp00m, hliyan, teoli, scunliffe
 Last updated by: chrisdavidmills,