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


var aLength = Storage.length;

Return value

An integer.


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.


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support4123.5810.54
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support1818136113.2 ?

See also

Document Tags and Contributors

Contributors to this page: fscholz, mattjbrent, chrisdavidmills, abbycar, teoli
Last updated by: fscholz,