This is an easy-to-use Javascript class to create a line graph in d3.js (v5). It has support for zooming the graph and uses a mouse-over legend. See here for an example of it being used.

It can be used as follows:

var graph = new LineGraph("#selector", "/path/to/data.json");
graph.buildWhenReady(800, 400); // width, height

and expects the following JSON data format:

{
  "meta": {
    "xlabel": "",
    "ylabel": "",
    "ymin": 0,
    "ymax": 10,
    "xmin": 0,
    "xmax": 100,
  },
  "data": {
    "X": [1 2, 3, 4, 5],
    "series": [
      {
        "name": "Y_1",
        "values": [0.1, 0.2, 0.3, 0.4, 0.5]
      },
      {
        "name": "Y_2",
        "values": [2, 1, 0, -1, -2]
      }
    ]
  }
}

Adding xmin, xmax, ymin, and ymax is optional. The accompanying graph.scss adds the necessary styling.

License: MIT. Created by Gertjan van den Burg.