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 Standard # dom-storage-length-dev |
Browser compatibility
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