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Storage: length property

files/en-us/web/api/storage/length/index.md

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{{APIRef("Web Storage API")}}

The length read-only property of the {{domxref("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

{{Specifications}}

Browser compatibility

{{Compat}}

See also