logarithmic: Boolean

Setting logarithmic property to true changes axis scale to logarithmic scale. Default Logarithm Base is 10 – which you can customize using logarithmBase property.

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 axisY:{
   .
   .
   logarithmic:  true
   .
   .
 },
 .
 . 
});
chart.render();