Storage: length property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The length
read-only property of the
Storage
interface returns the number of data items stored in a given
Storage
object.
Value
The number of items stored in the Storage
object.
Examples
The following function adds three data items to the local storage for the current domain, then returns the number of items in the storage:
js
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 # dom-storage-length-dev |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | |||||||||||
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length |
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
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.