Storage: length property - Web APIs | MDN (original) (raw)

Baseline

Widely available

The length read-only property of theStorage interface returns the number of data items stored in a givenStorage 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:

function populateStorage() {
  localStorage.setItem("bgcolor", "yellow");
  localStorage.setItem("font", "Helvetica");
  localStorage.setItem("image", "cats.png");

  return localStorage.length; // Should return 3
}

Specifications

Browser compatibility

See also