Convert bytes to KiB, MiB, etc.

humanBytes.js

// Convert bytes to KiB, MiB, etc. (object)
// humanBytes( number, numDecimals )
// ex. humanBytes( 10714 ) = { number: 10, str: "10 KiB", unit: "KiB" }
// ex. humanBytes( 10714 ).str = "10 KiB"
// ex. humanBytes( 10714, 2 ).str = "10.46 KiB"
function humanBytes( bytes, decimals ) {
  var units = ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
  var unit = 'B';
  var num = bytes;
  var dec = decimals !== undefined ? Math.pow( 10, decimals ) : 1;
  var i = 0;

  while( num >= 1024 ) {
    if( units[i] == undefined ) {
      break;
    }
    num = num / 1024;
    unit = units[i];
    i++;
  }

  num = Math.round( num * dec ) / dec;

  return {
    str:	num +' '+ unit,
    unit:	unit,
    number:	num
  };
}