Doubt of how to format value using Chart Chart JS

This is possible through graph options (existing but not very clear in documentation ), using tooltipTemplate and scaleLabel to change the text within the graph and the Y axis respectively.

In practice it could be done like this:

var formatedString = '<%= "R$ " + value.toString().split(".").join(",") %>';

var options = {
    scaleFontFamily: "'Verdana'",
    scaleFontSize: 13,
    animation: false,
    scaleFontColor: "#484848",
    responsive: true,
    tooltipTemplate: formatedString,
    scaleLabel: formatedString
};

jsFiddle: link

If you want, you can also use a function to format the string. The function receives an object as the first argument and the value is in the .value property. For example: link

When working with more than dataset , you should use the option multiTooltipTemplate instead of tooltipTemplate .

Ex.

multiTooltipTemplate: function(data) {
    return formatar(data.value);
  }

I've updated your example this way and it's working.

link