Most basic barplot in d3.js

This post describes how to build a very basic barplot with d3.js. You can see many other examples in the barplot section of the gallery. Learn more about the theory of barplot in

Barplot section


  • The Html part of the code just creates a div that will be modified by d3 later on.

  • The first part of the javascript code set a svg area. It specify the chart size and its margin. Read more.

  • Data shows the amount of sold weapon per country. See data-to-viz if interested.

  • First step consists to make a numeric (Y axis) and a categoric scale (X axis). Read here to understand how scales and axis work.

  • Finally, the bars can be added using rectangle
<!DOCTYPE html>
<meta charset="utf-8">

<!-- Load d3.js -->
<script src=""></script>

<!-- Create a div where the graph will take place -->
<div id="my_dataviz"></div>


// set the dimensions and margins of the graph
var margin = {top: 30, right: 30, bottom: 70, left: 60},
    width = 460 - margin.left - margin.right,
    height = 400 - - margin.bottom;

// append the svg object to the body of the page
var svg ="#my_dataviz")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + + margin.bottom)
          "translate(" + margin.left + "," + + ")");

// Parse the Data
d3.csv("", function(data) {

// X axis
var x = d3.scaleBand()
  .range([ 0, width ])
  .domain( { return d.Country; }))
  .attr("transform", "translate(0," + height + ")")
    .attr("transform", "translate(-10,0)rotate(-45)")
    .style("text-anchor", "end");

// Add Y axis
var y = d3.scaleLinear()
  .domain([0, 13000])
  .range([ height, 0]);

// Bars
    .attr("x", function(d) { return x(d.Country); })
    .attr("y", function(d) { return y(d.Value); })
    .attr("width", x.bandwidth())
    .attr("height", function(d) { return height - y(d.Value); })
    .attr("fill", "#69b3a2")



Related blocks →

  • Simple bar graph in v4 - link

  • Let's make a bar chart - link