chartjs-cli

A command-line tool for creating charts using Chart.js.

Setup and usage

Install chartjs-cli using npm:

npm install --global chartjs-cli

This will install the chartjs tool which is used to create images from Chart.js source files. The basic usage is:

chartjs chart.json chart.png

The chart.json is the Chart.js options.

{
    "type": "bar",
    "data": {
        "labels": ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
        "datasets": [{
            "label": "# of Votes",
            "data": [12, 19, 3, 5, 2, 3],
            "backgroundColor": [
                "rgba(255, 99, 132, 1)",
                "rgba(54, 162, 235, 1)",
                "rgba(255, 206, 86, 1)",
                "rgba(75, 192, 192, 1)",
                "rgba(153, 102, 255, 1)",
                "rgba(255, 159, 64, 1)"
            ],
            "borderColor": [
                "rgba(255,99,132,1)",
                "rgba(54, 162, 235, 1)",
                "rgba(255, 206, 86, 1)",
                "rgba(75, 192, 192, 1)",
                "rgba(153, 102, 255, 1)",
                "rgba(255, 159, 64, 1)"
            ],
            "borderWidth": 1
        }]
    },
    "options": {
        "scales": {
            "yAxes": [{
                "ticks": {
                    "beginAtZero":true
                }
            }]
        }
    }
}

Options

There are a number of options to control the output.

format, f

string

Default: png

The format of the image: png, jpeg, gif.

height, h

number

Default: 600

The height of the resulting image in pixel.

width, w

number

Default: 600

The width of the resulting image in pixel.