How to determine if the value is null in JSON using JavaScript?

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To determine if a value is null in a JSON object using JavaScript, you can use the strict equality operator (===) to compare the value to null. For example:

let jsonObj = {
   "name":"John",
   "age":null,
   "city":"New York"
}

if (jsonObj.age === null) {
   console.log("Age is null");
} else {
   console.log("Age is not null");
}

In this example, the code checks if the "age" property in the jsonObj object is null. If it is, the code logs "Age is null" to the console. Otherwise, it logs "Age is not null".