var nameArray1 = ["John", "David", "Mike", "Sam", null];
if (nameArray1.includes(null) == true) {
   console.log("array1 contains null value");
} else {
   console.log("array1 does not contains null value");
}
var nameArray2 = ["Adam", "Bob", "Robert"];
if (nameArray2.includes(null) == true) {
   console.log("array2 contains null value");
} else {
   console.log("array2 does not contains null value");
}
var objectData = { name: null };
if (Object.values(objectData).includes(null)) {
   console.log("object contains null value");
   } else {
      console.log("object does not contains null value");
}

node fileName.js.

PS C:\Users\Amit\javascript-code> node demo314.js
array1 contains null value
array2 does not contains null value
object contains null value