{"id":202175,"date":"2025-01-10T03:40:59","date_gmt":"2025-01-10T03:40:59","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/how-to-check-null-value-in-json-object-in-java\/"},"modified":"2025-01-10T03:40:59","modified_gmt":"2025-01-10T03:40:59","slug":"how-to-check-null-value-in-json-object-in-java","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-check-null-value-in-json-object-in-java\/","title":{"rendered":"How to check null value in JSON object in Java?"},"content":{"rendered":"

To check if a value in a JSON object is null in Java, you can use the `isNull()` method provided by the `JSONObject` class in the `org.json` package. This method returns true if the specified key exists in the JSON object and its value is null, and false otherwise. Here is an example code snippet demonstrating how to check for null values in a JSON object:<\/p>\n

“`
\nimport org.json.JSONObject;<\/p>\n

public class Main {
\n public static void main(String[] args) {
\n \/\/ Create a JSON object
\n JSONObject jsonObject = new JSONObject();<\/p>\n

\/\/ Put a null value in the JSON object
\n jsonObject.put(“key”, JSONObject.NULL);<\/p>\n

\/\/ Check if the value is null
\n if (jsonObject.isNull(“key”)) {
\n System.out.println(“Value is null”);
\n } else {
\n System.out.println(“Value is not null”);
\n }
\n }
\n}
\n“`<\/p>\n

In this example, we create a JSON object and put a null value with the key “key” in it. We then use the `isNull()` method to check if the value associated with the key “key” is null.<\/p>\n

**Answer: The `isNull()` method in the `JSONObject` class can be used to check if a value in a JSON object is null in Java.**<\/p>\n

\n
\n

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