To check if there is a null value in an object or array, use the concept of includes().
Example
Following is the code −
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"); }
To run the above program, you need to use the below command −
node fileName.js.
Here, my file name is demo314.js.
Output
This will produce the following output −
PS C:\Users\Amit\javascript-code> node demo314.js array1 contains null value array2 does not contains null value object contains null value