CryptoKey: algorithm property

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The read-only algorithm property of the CryptoKey interface returns an object describing the algorithm for which this key can be used, and any associated extra parameters.

The object returned depends of the algorithm used to generate the key.


An object matching:


const rawKey = window.crypto.getRandomValues(new Uint8Array(16));

// Import an AES secret key from an ArrayBuffer containing the raw bytes.
// Takes an ArrayBuffer string containing the bytes, and returns a Promise
// that will resolve to a CryptoKey representing the secret key.
function importSecretKey(rawKey) {
  return window.crypto.subtle.importKey("raw", rawKey, "AES-GCM", true, [

const key = importSecretKey(rawKey);
console.log(`This key is to be used with the ${key.algorithm} algorithm.`);


Web Cryptography API
# dom-cryptokey-algorithm

Browser compatibility

BCD tables only load in the browser