Generate Random Bytes

randomBytes

The randomBytes function generates random bytes in the Uint8Array format.

Function Signature

randomBytes(size?: number): Uint8Array

Parameters

Return Value

Returns a Uint8Array of the specified size containing randomly generated bytes.

Example Usage

Use Cases

• Generating cryptographic keys
• Creating raw binary seeds/nonces
• Preparing buffers for cryptographic operations
• Creating unique binary payloads

Implementation Notes

• It uses crypto.getRandomValues when available for secure randomness, and falls back to Math.random if not.
• If crypto.getRandomValues is available (supported environments include browser and Node.js), it is used for cryptographically secure random number generation.
• In environments where crypto.getRandomValues is not available, the function falls back to Math.random, which is not cryptographically secure.
• If size is 0 or negative, an empty Uint8Array is returned.

See Also

• randomHex - Generate cryptographically secure random hex strings
• randomNumeric - Generate cryptographically secure random numeric strings
• randomAlphaNumeric - Generate cryptographically secure random alphanumeric strings
• randomID - Generate customizable random alphanumeric ID (cryptographically not secure)