Chartjs-Chart.JS Multiline Chart with unknown numbers of Lines from JSON

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From what I understand, your dataset will get dynamically updated.

You can just change your dataset then call the update() function.

For example:

First initialize your chart with all the data using:

var canvas = document.getElementById("barChart");
var ctx = canvas.getContext('2d');

var data = {
  labels: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
  datasets: [{
      label: "name 1",
      fill: false,
      lineTension: 0.1,
      backgroundColor: "rgba(225,0,0,0.4)",
      borderColor: "red",
      borderCapStyle: 'square',
      borderDash: [],
      borderDashOffset: 0.0,
      borderJoinStyle: 'miter',
      pointBorderColor: "black",
      pointBackgroundColor: "white",
      pointBorderWidth: 1,
      pointHoverRadius: 8,
      pointHoverBackgroundColor: "yellow",
      pointHoverBorderColor: "brown",
      pointHoverBorderWidth: 2,
      pointRadius: 4,
      pointHitRadius: 10,
      data: [65, 59, 80, 81, 56, 55, 40, ,60,55,30,78]
    }, {
      label: "name 2",
      fill: true,
      lineTension: 0.1,
      backgroundColor: "rgba(167,105,0,0.4)",
      borderColor: "rgb(167, 105, 0)",
      borderCapStyle: 'butt',
      borderDash: [],
      borderDashOffset: 0.0,
      borderJoinStyle: 'miter',
      pointBorderColor: "white",
      pointBackgroundColor: "black",
      pointBorderWidth: 1,
      pointHoverRadius: 8,
      pointHoverBackgroundColor: "brown",
      pointHoverBorderColor: "yellow",
      pointHoverBorderWidth: 2,
      pointRadius: 4,
      pointHitRadius: 10,
      data: [10, 20, 60, 95, 64, 78, 90,,70,40,70,89]
    }

  ]
};

var options = {
  scales: {
            yAxes: [{
                ticks: {
                    beginAtZero:true
                },
                scaleLabel: {
                     display: true,
                     labelString: 'Moola',
                     fontSize: 20 
                  }
            }]            
        }  
};

// Chart declaration:
var myBarChart = new Chart(ctx, {
  type: 'line',
  data: data,
  options: options
});

Then if you later want to update your data, you can just:

myBarChart.data.datasets = [{
      label: "name 3",
      fill: true,
      lineTension: 0.1,
      backgroundColor: "rgba(167,105,0,0.4)",
      borderColor: "rgb(167, 105, 0)",
      borderCapStyle: 'butt',
      borderDash: [],
      borderDashOffset: 0.0,
      borderJoinStyle: 'miter',
      pointBorderColor: "white",
      pointBackgroundColor: "black",
      pointBorderWidth: 1,
      pointHoverRadius: 8,
      pointHoverBackgroundColor: "brown",
      pointHoverBorderColor: "yellow",
      pointHoverBorderWidth: 2,
      pointRadius: 4,
      pointHitRadius: 10,
      data: [10, 20, 60, 95, 64, 78, 90,,70,40,70,89]
    },
    ...............
];

myBarChart.update();

Also, you will need to format your data in a way that can be used with the charts.
Format your data so that you can create a proper dataset.

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