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 Web Storage Demo.

Specifications

Specification
HTML Standard (HTML) # dom-storage-length-dev

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`length`	4	12	3.5	8	10.5	4	≤37	18	6	11	3.2	1.0