Convert hex strings to binary strings.

hexstr2binstr.js

var str = '0x48 0x65 0x6c 0x6c 0x6f'; // Hello

hexstr2binstr(str); //--> '0100 1000 0110 0101 0110 1100 0110 1100 0110 1111'

function hexstr2binstr(hexstr) {
  return hexstr.split(' ').map(function (v) {
    var bins = Number(v).toString(2).split('');
    while (bins.length < 8) {
      bins.unshift('0'); // left padding with '0'
    }
    bins.splice(4, 0, ' '); // add space at each 4 unit
    return bins.join('');
  }).join(' ');
}