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Angeles Ex","score":"20.0","id":"4"}],"server":{"ip":"130.159.196.118"}}

line.css

body {
  font: 10px sans-serif;
}

.rule line {
  stroke: #eee;
  shape-rendering: crispEdges;
}

.rule line.axis {
  stroke: #000;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}

line.html

<!DOCTYPE html>
<html>
  <head>
    <title>Line Chart</title>
    <link type="text/css" rel="stylesheet" href="line.css"/>
    <script type="text/javascript" src="http://st.pimg.net/ntpbeta/d3/d3.v3e5eb2c.js"></script>
    <script src="http://st.pimg.net/ntpbeta/d3/d3.time.vcf434c7.js" type="text/javascript"></script>
  </head>
  <body>
    <script type="text/javascript" src="line.js"></script>
  </body>
</html>

line.js

d3.json("./data.json", function(json) {

    var history = json.history;

    history.forEach(function(i,d) {
        d.date = new Date(d.ts * 1000);
    });

    var w = 450,
        h = 275,
        p = 20,
    	x = d3.time.scale.utc().domain(
            [d3.min(history.map(function(e){ return e.date })),
             d3.max(history.map(function(e){ return e.date }))
            ])
            .range([0, w]);

        y = d3.scale.linear().domain([10, 20]).range([0, h]);

        var svg = d3.select("body")
            .append("svg")
            .attr("width", w + p * 2)
            .attr("height", h + p * 2)
            .append("g")
            .attr("transform", "translate(" + p + "," + p + ")");

        // just to show the data before the svg. chain;
        // this should be called on the chain below.
        var dh = history.filter(function(d) {
            return d.monitor_id === null ? true : false
        });
        console.log("line data", dh);

        svg.selectAll("path.line")
            .data(dh)
            .enter().append("path")            
            .attr("class", "line")
            .attr("d", d3.svg.line()
            .x(function(d) { console.log("X", d.x); return x(d.x); })
            .y(function(d) { return y(d.y); }));

});