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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Storage/key below:

Storage: key() method - Web APIs

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The key() method of the Storage interface, when passed a number n, returns the name of the nth key in a given Storage object. The order of keys is user-agent defined, so you should not rely on it.

index

An integer representing the number of the key you want to get the name of. This is a zero-based index.

A string containing the name of the key. If the index does not exist, null is returned.

The following function iterates over the local storage keys:

function forEachKey(callback) {
  for (let i = 0; i < localStorage.length; i++) {
    callback(localStorage.key(i));
  }
}

The following function iterates over the local storage keys and gets the value set for each key:

for (let i = 0; i < localStorage.length; i++) {
  console.log(localStorage.getItem(localStorage.key(i)));
}

Note: For a real-world example, see our Web Storage Demo.

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