generate random color and converts to desired format var color = new just.RandomColor({ r: 50, 60, g: 100,200, a: 0.3, 0.7}); color.value // eg. Object {r: 57, g: 126, b: 246, a: 0.6} color.toHex().value // eg. "3c7dc6" color.toRGB().toCSS() // "rgb(60,125,198)"