A Simple d3 Network Graph

<!DOCTYPE html>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v2.min.js?2.9.3"></script>
<style>

.link {
  stroke: #aaa;
}

.node text {
stroke:#333;
cursos:pointer;
}

.node circle{
stroke:#fff;
stroke-width:3px;
fill:#555;
}

</style>
<body>
<script>

var width = 960,
    height = 500

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var force = d3.layout.force()
    .gravity(.05)
    .distance(100)
    .charge(-100)
    .size([width, height]);

d3.json("graphFile.json", function(json) {
  force
      .nodes(json.nodes)
      .links(json.links)
      .start();

var link = svg.selectAll(".link")
      .data(json.links)
    .enter().append("line")
      .attr("class", "link")
    .style("stroke-width", function(d) { return Math.sqrt(d.weight); });

var node = svg.selectAll(".node")
      .data(json.nodes)
    .enter().append("g")
      .attr("class", "node")
      .call(force.drag);

node.append("circle")
      .attr("r","5");

node.append("text")
      .attr("dx", 12)
      .attr("dy", ".35em")
      .text(function(d) { return d.name });

force.on("tick", function() {
    link.attr("x1", function(d) { return d.source.x; })
        .attr("y1", function(d) { return d.source.y; })
        .attr("x2", function(d) { return d.target.x; })
        .attr("y2", function(d) { return d.target.y; });

node.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
  });
});

</script>

Modified http://d3js.org/d3.v2.min.js?2.9.3 to a secure url

https://d3js.org/d3.v2.min.js?2.9.3