if you're concerned only about the presence of property and not what the value is

c3.js

const obj =   {
  name:"github",
  url:"github.com"
}
//to check if the color property is present on the object or not or it's value is null
if(obj.color === null || obj.color === undefined){ 
  console.log("this propery is not present on the obj")
}

// you can do this like this way

if(obj.color == null){       // it will cover both the case i.e obj.color == null and obj.color == undefined
  console.log("this property is not present on the obj")
}