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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 = 960;
var height = 500;
var svg = d3.select("body").append("svg")
.attr("width", 960)
.attr("height", 500)
var mercator = d3.geoMercator().center([29.1,41,6]).scale(100569)
var path = d3.geoPath().projection(mercator)
d3.json('istanbul.geojson', function(json) {
geojson = json;
console.log(geojson);
var allPaths = svg.selectAll("path")
.data(geojson.features)
.enter()
.append("path")
.attr("d", path)
.style("stroke", "white")
.style("stroke-width", "2")
.style("fill", "#ccc")
})
</script>
</body>
https://d3js.org/d3.v4.min.js