user37515: I can generate a byte array with
var myByteArray = window.crypto.getRandomValues(new Uint8Array(16))

and I get 
181,143,16,173,231,56,63,149,181,185,224,124,84,230,123,36

I can then turn this into a string with 
cryptoHelpers.convertByteArrayToString(myByteArray);

and i get 
µ­ç8?µ¹à|Tæ{$

But what I really want is a 128 bit hexadecimal like...
6a3e52297b2e593f4d506f7164

And I want to be able to go back from hexadecimal to a byte array. 
Is there a copy and paste function or library to make this magic happen?

user2306: Here's something you can copy-paste in.
byteArray = new Uint8Array([181,143,16,173,231,56,63,149,181,185,224,124,84,230,123,36]);
function toHexString(byteArray) {
  return Array.prototype.map.call(byteArray, function(byte) {
    return ('0' + (byte & 0xFF).toString(16)).slice(-2);
  }).join('');
}
function toByteArray(hexString) {
  var result = [];
  for (var i = 0; i < hexString.length; i += 2) {
    result.push(parseInt(hexString.substr(i, 2), 16));
  }
  return result;
}
hexString = toHexString(byteArray);
byteArray = toByteArray(hexString);

From here/here.

37515: <p>I can generate a byte array with</p>

<pre><code>var myByteArray = window.crypto.getRandomValues(new Uint8Array(16))
</code></pre>

<p>and I get </p>

<pre><code>181,143,16,173,231,56,63,149,181,185,224,124,84,230,123,36
</code></pre>

<p>I can then turn this into a string with </p>

<pre><code>cryptoHelpers.convertByteArrayToString(myByteArray);
</code></pre>

<p>and i get </p>

<pre><code>µ­ç8?µ¹à|Tæ{$
</code></pre>

<p>But what I really want is a 128 bit hexadecimal like...</p>

<pre><code>6a3e52297b2e593f4d506f7164
</code></pre>

<p>And I want to be able to go back from hexadecimal to a byte array. </p>

<p>Is there a copy and paste function or library to make this magic happen?</p>
 2306: <p>Here's something you can copy-paste in.</p>

<pre><code>byteArray = new Uint8Array([181,143,16,173,231,56,63,149,181,185,224,124,84,230,123,36]);
function toHexString(byteArray) {
  return Array.prototype.map.call(byteArray, function(byte) {
    return ('0' + (byte &amp; 0xFF).toString(16)).slice(-2);
  }).join('');
}
function toByteArray(hexString) {
  var result = [];
  for (var i = 0; i &lt; hexString.length; i += 2) {
    result.push(parseInt(hexString.substr(i, 2), 16));
  }
  return result;
}
hexString = toHexString(byteArray);
byteArray = toByteArray(hexString);
</code></pre>

<p>From <a href="https://stackoverflow.com/questions/14603205/how-to-convert-hex-string-into-a-bytes-array-and-a-bytes-array-in-the-hex-strin">here</a>/<a href="https://stackoverflow.com/questions/34309988/byte-array-to-hex-string-conversion-in-javascript">here</a>.</p>
