To convert byte array to Hex string conversion in JavaScript, we use the Array.from method.

For instance, we write

const toHexString = (byteArray) => {
  return Array.from(byteArray, (byte) => {
    return `0${(byte & 0xff).toString(16).slice(-2)}`;
  }).join("");
};

to define the toHexString function.

In it, we call Array.from with byteArray and a callback to convert each byte to a hex string.

The callback does a bitwise and with 0xff and then convert that to a hex string with toString called with 16.

And then we get the substring from the 3rd last index to the end of the string with slice.

Then we join the array of hex strings into a string with join.