Generate Random Hex

randomHex

The randomHex function generates a random hexadecimal string of the specified length.

Function Signature

randomHex(length: number, uppercase?: boolean): string

Parameters

Return Value

Returns a randomly generated hexadecimal string of the specified length.

Example Usage

Use Cases

• Generating unique identifiers
• Creating random tokens for authentication
• Generating cryptographic nonces
• Creating temporary file names

Implementation Notes

• This function generates a random hexadecimal string of the specified length.
• If length is 0 or negative, an empty string is returned.
• It uses crypto.getRandomValues when available for secure randomness, and falls back to Math.random if not.
• The output is a string of hex characters (0–9, a–f or A–F when uppercase) with no prefixes or separators.
• The uppercase parameter controls whether the hex characters are uppercase or lowercase. By default, it returns lowercase hex.
• The function is designed to be efficient and works in both browser and Node.js environments without relying on external libraries.

See Also

• randomBytes - Generate random bytes (Uint8Array)
• randomNumeric - Generate random numeric strings
• randomAlphaNumeric - Generate random alphanumeric strings