How to convert a hexadecimal string to Uint8Array and back in JavaScript?

Question

I want to convert a hexadecimal string like bada55 into a Uint8Array and back again.

Answer 1

Node.js

For JavaScript running on Node you can do this:

const hexString = 'bada55';

const hex = Uint8Array.from(Buffer.from(hexString, 'hex'));

const backToHexString = Buffer.from(hex).toString('hex');

(source: this answer by @Teneff, shared with permission)