title: 64bit Hex to Decimal in Javascript
body: <p>Need to convert 64bit hex to decimal in node, preferably without 3rd party lib.</p>
  
  <p>Input:</p>
  
  <pre><code>Hex: 0x3fe2da2f8bdec5f4
  Hex: 0x402A000000000000
  </code></pre>
  
  <p>Output</p>
  
  <pre><code>Dec: .589134
  Dec: 13
  </code></pre>