Stacked bar chart

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
   var dataIntermediate=['A','B'].map(function(key,i){
    return data.map(function(d,j){
        return {x: d['month'], y: d[key] };
    })
})
​
  </script>
</body>
​
    

https://d3js.org/d3.v4.min.js