how to download json object as a file

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Javascript

JSON

HTML5

Canvas

i can export canvas to JSON using the following code

var canvas = new fabric.Canvas('c');
data = JSON.stringify(canvas)

and can load back using this call

canvas.loadFromJSON(data, canvas.renderAll.bind(canvas));

what i want is to save the "data" as a file on client side, giving the client the functionality to save his work on his machine and load it whenever he wants to continue

so how to download the JSON object as a file and reload it just using javascript