Fill localStorage until the last byte possible

fillLocalStorage.js

// Only count bytes inserted as values, not counting keys...
(function() {
  localStorage.clear();

  var nbBytes = 5000, // about 0.5Mb
      oneByte = 'x',
      i = 0,
      totalBytesInserted = 0;

  function repeat(string, length) {
    var result = '';
    for (var i = 0; i < length; i++) {
      result += string;
    }
    return result;
  }

  // Go as far as inserting bytes per bytes
  while (nbBytes > 1) {
    var myString = repeat(oneByte, nbBytes);
    try {
      window.localStorage.setItem(i, myString);
      totalBytesInserted = totalBytesInserted + nbBytes;
      // console.log(totalBytesInserted);
      // console.log(nbBytes + ' bytes inserted');
    } catch (e) {
      console.error('Error :', e);
      console.error('nbBytes :', nbBytes);
      // Reduce number of bytes to insert
      nbBytes = parseInt(nbBytes / 2, 10);
    }
    i++;
  }

  console.warn('Inserted ' + (totalBytesInserted/1024/1024) + ' Mbytes in ' + i + ' iteration');
})();

Awesome! Thanks!