Uint8Array.fromHex()

string

A hexadecimal string encoding bytes to convert to a Uint8Array. The string must:

• Have an even number of characters because two characters encode one byte.
• Only contain characters in the hexadecimal alphabet, which includes 0–9 and A–F (case-insensitive).
• Not contain whitespace (unlike Uint8Array.prototype.setFromBase64()).

A new Uint8Array object containing the decoded bytes from the hexadecimal string.

SyntaxError

Thrown if the input string contains characters outside the hex alphabet, or its length is odd.

TypeError

Thrown if the input string is not a string.

This example decodes a hexadecimal string into a Uint8Array.

const hexString = "cafed00d";
const bytes = Uint8Array.fromHex(hexString);
console.log(bytes); // Uint8Array [ 202, 254, 208, 13 ]

Uppercase characters are also supported:

const hexString = "CAFEd00d";
const bytes = Uint8Array.fromHex(hexString);
console.log(bytes); // Uint8Array [ 202, 254, 208, 13 ]

• Polyfill of Uint8Array.fromHex in core-js
• Uint8Array
• Uint8Array.prototype.setFromHex()
• Uint8Array.prototype.toHex()
• parseInt()