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JavaScript API

crypto

JsonWebKey

Open source

JsonWebKey

The JsonWebKey object represents object/dictionary generated by exporting a CryptoKey or used as an input parameter for key import.

The properties of the JsonWebKey could vary depending on the algorithm and key type. See specification JsonWebKey for details.

Properties

Property	Type	Description
kty	`string`	The key type.
k	`string`	The key value.
alg	`string`	The algorithm.
ext	`bool`	The key is extractable.
key_ops	`string` array	The key operations.
crv	`string`	The curve name.
x	`string`	The x coordinate.
y	`string`	The y coordinate.
d	`string`	The private key.

Example

export default async function () {
  const jwk = {
    alg: 'HS256',
    ext: true,
    k: 'H6gLp3lw7w27NrPUn00WpcKU-IJojJdNzhL_8F6se2k',
    key_ops: ['sign', 'verify'],
    kty: 'oct',
  };

  const importedKey = await crypto.subtle.importKey(
    'jwk',
    jwk,
    { name: 'HMAC', hash: { name: 'SHA-256' } },
    true,
    ['sign', 'verify']
  );

  const exportedAgain = await crypto.subtle.exportKey('jwk', importedKey);

  console.log('exported again: ' + JSON.stringify(exportedAgain));
  // should print
  // INFO[0000] exported again: {"k":"H6gLp3lw7w27NrPUn00WpcKU-IJojJdNzhL_8F6se2k","kty":"oct","ext":true,"key_ops":["sign","verify"],"alg":"HS256"}  source=console
}