Json Library Java Jun 2026

JSONArray hobbies = new JSONArray(); hobbies.put("reading"); hobbies.put("swimming"); obj.put("hobbies", hobbies);

At its core, a JSON library in Java serves two primary functions: (converting Java objects into JSON strings) and deserialization (parsing JSON strings back into Java objects). This process is critical for:

If you're starting a new Java project today, . It's the most powerful, fastest, and most widely supported. For small utilities or quick prototypes, Gson offers a friendlier learning curve. And if you're constrained to the standard library, JSON-java gets the job done with zero fuss. json library java

Choosing a JSON library in Java depends heavily on your specific use case (e.g., are you using Spring Boot? Do you need raw performance? Are you binding data to objects?).

Does not require annotations to map JSON fields, which is great for quick implementation. JSONArray hobbies = new JSONArray(); hobbies

is a popular library from Google known for its ease of use and simple, straightforward API. While Jackson is a data-processing powerhouse, Gson focuses on simplicity.

<dependency> <groupId>jakarta.json.bind</groupId> <artifactId>jakarta.json.bind-api</artifactId> <version>3.0.0</version> </dependency>  <dependency> <groupId>org.eclipse</groupId> <artifactId>yasson</artifactId> <version>3.0.3</version> </dependency>  <dependency> <groupId>jakarta.json</groupId> <artifactId>jakarta.json-api</artifactId> <version>2.1.1</version> </dependency> For small utilities or quick prototypes, Gson offers

JSON-B is just a specification. You need an implementation like or Apache Johnzon .

// Serialize (Object -> JSON) User user = new User("John", 30); String json = mapper.writeValueAsString(user); // Output: "name":"John","age":30