Storage.length

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
}

Specifications

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

Browser compatibility

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

See also

Using the Web Storage API