Json — Library Java

Whichever library you choose, mastering JSON processing is essential for modern Java development. Now go convert those objects to JSON and back! Did I miss your favorite library? Let me know about JSON-smart, Moshi (from Square), or Boon in the comments below!

Java lacks built-in JSON support in its standard library (until very recently, with JSON Binding in Jakarta EE). Fortunately, the ecosystem offers several mature, high-performance options. json library java

String json = "\"name\":\"Bob\",\"age\":25"; User user = mapper.readValue(json, User.class); System.out.println(user.getName()); // Bob Whichever library you choose, mastering JSON processing is

// Deserialize User result = jsonb.fromJson(json, User.class); | Library | Serialization Speed | Deserialization Speed | Memory Usage | |---------|--------------------|----------------------|---------------| | Jackson | Fastest | Fastest | Moderate | | Gson | Fast | Fast | Low | | JSON-java | Slow | Slow | High (creates many objects) | | JSON-B (Yasson) | Moderate | Moderate | Moderate | Let me know about JSON-smart, Moshi (from Square),

@JsonIgnoreProperties(ignoreUnknown = true) public class User // ...

ObjectMapper mapper = new ObjectMapper(); User user = new User("Alice", 30); String json = mapper.writeValueAsString(user); System.out.println(json); // Output: "name":"Alice","age":30

import org.json.JSONObject; import org.json.JSONArray; JSONObject obj = new JSONObject(); obj.put("name", "David"); obj.put("age", 40);