How to hide y axis line in ChartJs?

From version 3 upwards, you should use this options to hide axes completely:

Picture: chartjs-without-axes

scales: {
   x: {
      display: false,
   },
   y: {
      display: false,
   }
},

UPDATE:

If you want to hide only the lines (and keep ticks) , move display: false config to "grid" parameter, like this:

scales: {
   y: {
      grid: {
         display: false
      }
   }
}

This disables the vertical Y axis line:

options: {
  scales: {
    yAxes: [{
      gridLines: {
        drawBorder: false,
      },
    }]
  },
},

This can be combined with display to disable the vertical gridLines:

xAxes: [{
  gridLines: {
    display: false,
  },
}],

Here's a working example: http://codepen.io/anon/pen/xqGGaV

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