Chartjs-How to dynamically update data in chart.js

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You should define your variable to hold the Chart outside the mounted function in order to be visible to the other methods.

So instead use this

let linechart;

export default {
  name: "line-plot",
  mounted() {
    const ctx = document.getElementById("line-chart");
    linechart = new Chart(ctx, this.chartData);
  },

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