Genes

<!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 svg = d3.select("body").append("svg")
      .attr("width", 2000)
      .attr("height", 1000)

/* svg.append("text")
      .text("Edit the code below to change me!")
      .attr("y", 200)
      .attr("x", 120)
      .attr("font-size", 36)
      .attr("font-family", "monospace")
	*/
    
    
     var genes=[{"name": "1", "start": 50, "end":100, "direction": "F", "function": 			"function1", "fill": "turquoise"},
      {"name": "2", "start": 120, "end":200, "direction": "F", "function": 							"Function 2", "fill": "lavendar"},
 		 {"name": "3", "start": 300, "end":350, "direction": "R", "function": "Function 3", "fill": "red"},
     {"name": "4", "start": 400, "end":480, "direction": "F", "function": "Function 4"}
               ];
    console.log(genes);
    
    svg.selectAll("rect")
    	.data(genes)
    	.enter()
    	.append("rect")
    	.attr("y",200)
    	.attr("start", function(d) {return d.start})
    	.attr("height", 50)
    	.attr("fill", function(d) {return d.fill})
    	.attr("stroke", "black");

</script>
</body>

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