Note: This feature is available in Web Workers.

The Crypto interface represents basic cryptography features available in the current context. It allows access to a cryptographically strong random number generator and to cryptographic primitives.

The Crypto is available in windows using the Window.crypto property and in workers using the the WorkerGlobalScope.crypto property.

Instance properties

This interface implements properties defined on RandomSource.

Crypto.subtle Read only Secure context

Returns a SubtleCrypto object providing access to common cryptographic primitives, like hashing, signing, encryption, or decryption.

Instance methods

This interface implements methods defined on RandomSource.


Fills the passed TypedArray with cryptographically sound random values.

Crypto.randomUUID() Secure context

Returns a randomly generated, 36 character long v4 UUID.


Web Cryptography API
# crypto-interface

Browser compatibility

BCD tables only load in the browser

See also