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The length read-only property of the Storage interface returns an integer representing the number of data items stored in the Storage object.

Syntax

var aLength = Storage.length;

Return value

An integer.

Example

The following function adds three data items to the local storage for the current domain, then returns the number of items in the storage:

function populateStorage() {
  localStorage.setItem('bgcolor', 'yellow');
  localStorage.setItem('font', 'Helvetica');
  localStorage.setItem('image', 'cats.png');

  localStorage.length; // should return 3
}

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

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'Storage.length' in that specification.
Living Standard  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support 4Edge Full support 12Firefox Full support 3.5IE Full support 8Opera Full support 10.5Safari Full support 4WebView Android Full support YesChrome Android Full support 18Edge Mobile Full support 13Firefox Android Full support 6Opera Android Full support 11Safari iOS Full support 3.2Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also

Tag del documento e collaboratori

Hanno collaborato alla realizzazione di questa pagina: mfluehr, fscholz, mattjbrent, chrisdavidmills, abbycar, teoli
Ultima modifica di: mfluehr,