Hi Sam ,

You need to use d3 in your client side. In the script tag , you can include this ..

<script src="http://d3js.org/d3.v3.min.js"></script>

If I may suggest , it is very important to learn to use arrays and javascript objects and learn to manipulate them using map, filter etc .These provide the needed data tod3 methods. After that , d3 can be learnt from the section “Data Visualization with D3” of the freecodecamp curriculam. Here I am assuming you want to use javascript + d3. Hope this helps.