String to Uint8Array

index.js

// source https://coolaj86.com/articles/unicode-string-to-a-utf-8-typed-array-buffer-in-javascript/

'use strict';

// string to uint array
function unicodeStringToTypedArray(s) {
    var escstr = encodeURIComponent(s);
    var binstr = escstr.replace(/%([0-9A-F]{2})/g, function(match, p1) {
        return String.fromCharCode('0x' + p1);
    });
    var ua = new Uint8Array(binstr.length);
    Array.prototype.forEach.call(binstr, function (ch, i) {
        ua[i] = ch.charCodeAt(0);
    });
    return ua;
}

unicodeStringToTypedArray('test')