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<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 = 1000,
height = 700;
var svg = d3.select('body')
.append('svg')
.attr('width', width)
.attr('height', height);
d3.json('istanbul.geojson', function(error,json) {
console.log(json);
var projection = d3.geoMercator();
var path = d3.geoPath().projection(projection)
projection.fitExtent([[0,0],[width,height]], json);
var areas = json.features.map(function(item){
return d3.geoArea(item)
})
console.log(areas);
svg.selectAll("path").data(json.features)
.enter()
.append("path")
.style("fill","#ccc")
.style("stroke","black")
.style('opacity', '0.1')
.style("stroke-width","2")
.attr("d", path)
})
</script>
</body>
https://d3js.org/d3.v4.min.js