Web/API/Storage/length

The length read-only property of the Storage interface returns the number of data items stored in a given Storage object.

Syntax

length = storage.length;

Return value

The number of items stored in the Storage object.

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');

  return localStorage.length; // Should return 3
}

Note: For a real world example, see our [[../../../../../../../mdn.github.io/dom-examples/web-storage/index|Web Storage Demo]].

Specifications

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

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`length`	Chrome Full support 4	Edge Full support 12	Firefox Full support 3.5	IE Full support 8	Opera Full support 10.5	Safari Full support 4	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 6	Opera Android Full support 11	Safari iOS Full support 3.2	Samsung Internet Android Full support 1.0

Legend

Full support: Full support