Shapes

<!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; }
    svg {
      width: 100%;
      height: 100%;
    }
  </style>
</head>

<body>
  <svg></svg>
  <script>
    const city = 'San Francisco';
    const width = 800;
    const height = 300;
    
    // dataset of city temperatures across time
    d3.json('data.json', (err, data) => {
      // clean the data
      data.forEach(d => {
        d.date = d3.timeParse("%Y%m%d")(d.date);
        d.date = new Date(d.date); 
        d[city] = d[city] + 1;
      });
      
      
      var xExtent = d3.extent(data, d => d.date);
      var xScale = d3.scaleTime()
      	.domain(xExtent).range([0, width]);
      var xAxis = d3.axisBottom().scale(xScale)
      var yExtent = d3.extent(data, d => d[city]);
      var yScale = d3.scaleLinear()
        .domain(yExtent).range([height, 0]);
      var yAxis = d3.axisLeft()
        .scale(yScale);

var svg = d3.select('svg').append('g')
        .attr('transform', 'translate(40, 20)');
      
      var line = d3.line()
      	.x(d => xScale(d.date))
      	.y(d => yScale(d[city]));
      
      svg.selectAll('path')
      	.data([data]).enter().append('path')
      	.attr('d', line)
      	.attr('fill', 'none')
      	.attr('stroke', 'blue');
    });
  </script>
</body>

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