JSFiddle - React, Tailwind, and code Playground

CSS

.axis {
			font: 10px sans-serif;
		}

		.axis path,
		.axis line {
			fill: none;
			stroke: #000;
			shape-rendering: crispEdges;
		}

JavaScript

var jdata = [
    {
        "date": "2013-01",
        "value": "53"
    },
    {
        "date": "2013-02",
        "value": "165"
    },
    {
        "date": "2013-03",
        "value": "269"
    },
    {
        "date": "2013-04",
        "value": "344"
    },
    {
        "date": "2013-05",
        "value": "376"
    },
    {
        "date": "2013-06",
        "value": "410"
    },
    {
        "date": "2013-07",
        "value": "421"
    },
    {
        "date": "2013-08",
        "value": "405"
    },
    {
        "date": "2013-09",
        "value": "376"
    },
    {
        "date": "2013-10",
        "value": "359"
    },
    {
        "date": "2013-11",
        "value": "392"
    },
    {
        "date": "2013-12",
        "value": "433"
    },
    {
        "date": "2014-01",
        "value": "455"
    },
    {
        "date": "2014-02",
        "value": "478"
    }
    ],


    //root = JSON.parse(jdata),
    //***EDIT*** jdata is not a string as required by JSON.parse
    //it's already well formed so just use it
    data = jdata,

    margin = {top: 20, right: 20, bottom: 70, left: 40},
    width = 600 - margin.left - margin.right,
    height = 300 - margin.top - margin.bottom,

    // Parse the date / time
    //***a better comment would be "for parsing the date and time"...
    parseDate = d3.time.format("%Y-%m").parse,

    x = d3.scale.ordinal().rangeRoundBands([0, width], .05),

    y = d3.scale.linear().range([height, 0]),

    xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .tickFormat(d3.time.format("%Y-%m")),

    yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(10),

    svg = d3.select("body").append("svg")
    //***EDIT***
    //the data method returns the enter collection and your not ready for it yet...
    //.data(root)
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform","translate(" + margin.left +...