# Jakarta JSON Binding (JSON-B)

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JSON-B is a standard binding layer for converting Java objects to/from JSON messages. It defines a default mapping algorithm for converting existing Java classes to JSON, while enabling developers to customize the mapping process through the use of Java annotations.

## Get it

### Maven
```xml
<!-- https://mvnrepository.com/artifact/jakarta.json.bind/jakarta.json.bind-api -->
<dependency>
    <groupId>jakarta.json.bind</groupId>
    <artifactId>jakarta.json.bind-api</artifactId>
    <version>3.0.0</version>
</dependency>
```

## Mapping a simple class

Suppose we have the following Java object, which we want to represent with JSON data:
```java
public class User {
  public long id;
  public String name;
  public int age;
}
```

Using the default mapping, this class can be serialized (as-is) to a JSON string:
```java
Jsonb jsonb = JsonbBuilder.create();

User bob = new User();
bob.id = 1234;
bob.name = "Bob";
bob.age = 42;

String bobJson = jsonb.toJson(bob);
System.out.println(bobJson); // {"id":1234,"name":"Bob","age":42}
```

Likewise, JSON data can be deserialized back into Java objects:
```java
Jsonb jsonb = JsonbBuilder.create();

String aliceJson = "{\"id\":5678,\"name\":\"Alice\",\"age\":42}";
User alice = jsonb.fromJson(aliceJson, User.class);
```

## How to run the TCK tests

The JSON-B TCK tests are produced as a Maven artifact where the tests use Arquillian + JUnit. To run the TCK tests using your implementation,
include the TCK module and apply the appropriate Arquillian container. See the [Eclipse Yasson](https://github.com/eclipse-ee4j/yasson) repository for an example of this.

## Links

- [Official web site](https://jakartaee.github.io/jsonb-api)
- [Eclipse project](https://projects.eclipse.org/projects/ee4j.jsonb)
- [User's Guide](https://jakartaee.github.io/jsonb-api/docs/user-guide.html)
- [Jenkins Builds](https://ci.eclipse.org/jsonb/view/all/)
- [Mailing list](https://www.eclipse.org/lists/jsonb-dev/)
- [Yasson (Compatible Implementation)](https://github.com/eclipse-ee4j/yasson)