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 | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'Storage.length' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
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