Correct way to convert size in bytes to KB, MB, GB in JavaScript

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I got this code to covert size in bytes via PHP.

Now I want to convert those sizes to human readable sizes using JavaScript. I tried to convert this code to JavaScript, which looks like this:

function formatSizeUnits(bytes){
  if      (bytes >= 1073741824) { bytes = (bytes / 1073741824).toFixed(2) + " GB"; }
  else if (bytes >= 1048576)    { bytes = (bytes / 1048576).toFixed(2) + " MB"; }
  else if (bytes >= 1024)       { bytes = (bytes / 1024).toFixed(2) + " KB"; }
  else if (bytes > 1)           { bytes = bytes + " bytes"; }
  else if (bytes == 1)          { bytes = bytes + " byte"; }
  else                          { bytes = "0 bytes"; }
  return bytes;
}

Is this the correct way of doing this? Is there an easier way?

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