How to parse JSON in Java? What libraries are used and what does the code look like?

Libraries commonly used for parsing JSON in Java include:

• Jackson (com.fasterxml.jackson)
• Gson (from Google)
• JSON-B (Java EE standard)

Example using Jackson:

import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;

public class User {
    public String name;
    public int age;
}

public class JsonParsingExample {
    public static void main(String[] args) throws IOException {
        String json = "{\"name\": \"Ivan\", \"age\": 30}";

        ObjectMapper mapper = new ObjectMapper();
        User user = mapper.readValue(json, User.class);

        System.out.println("Name: " + user.name);
        System.out.println("Age: " + user.age);
    }
}

Here, ObjectMapper converts a JSON string into a User object. Similarly, objects can be serialized back into JSON.