This module takes an rgb object and converts it to a number between 0 and 16777215 inclusive

rgb values must be between 0 and 255 inclusive

npm install rgb-to-int

var rgbToInt = require('int-to-rgb');
var int = rgbToInt({
  red: 42,
  green: 42,
  blue: 42
});
console.log(int)
// => 2763306