const chartStr = `{
  type: 'bar',
  data: {
    labels: ['January', 'February', 'March', 'April', 'May'],
    datasets: [{
      label: 'Dogs',
      data: [ 50, 60, 70, 180, 190 ]
    }]
  },
  options: {
    scales: {
      yAxes: [{
        ticks: {
          callback: function(value) {
            return '$' + value;
          }
        }
      }],
    },
  },
}`;

console.log(encodeURIComponent(chartStr));