Fabric.js: how to deselect one or multiple objects on canvas?

I may be late answering this, but in fabricjs (1.4.3) you can use the following to deselect all selected objects on the canvas.

canvas.deactivateAll().renderAll();

I am using this before creating a image of that canvas. Hope it helps someone.

for fabricjs 4.0 you can use:

canvas.discardActiveObject().renderAll();