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Seems like you are mixing chart.js 1.x syntax with chart.js 2.x
Dont think strokeColor is a valid option in chart.js 2.x.
Here is an example of how you can add some color.
[{
label: 'Info',
backgroundColor: "rgba(46, 44, 211, 0.2)",
borderColor: "rgba(46, 44, 211, 0.5)",
data: data
}
https://jsfiddle.net/brqc0tmw/4/
For more options look at the documentation
http://www.chartjs.org/docs/#line-chart-dataset-structure
Source:stackexchange.com