index.html
<!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>
var width = 700,
height = 580;
var svg = d3.select( "body" )
.append( "svg" )
.attr( "width", width )
.attr( "height", height );
var projection = d3.geoConicConformal()
.center([2.454071, 46.279229]).scale(3000);
var path = d3.geoPath()
.projection(projection);
d3.json("regions.json", function(json) {
svg.selectAll("path")
.data(json.features)
.enter()
.append("path")
.attr("d", path);
});
</script>
</body>