== Gson

JSON support using https://github.com/google/gson[Gson] library.

=== Usage

1) Add the dependency:

[dependency, artifactId="jooby-gson"]
.

2) Install and encode/decode JSON

.Java
[source, java, role="primary"]
----
import io.jooby.json.GsonModule;

{
  install(new GsonModule());                        <1>

  get("/", ctx -> {
    MyObject myObject = ...;
    return myObject;                                <2>
  });

  post("/", ctx -> {
    MyObject myObject = ctx.body(MyObject.class);   <3>
    ...
  });
}
----

.Kotlin
[source, kt, role="secondary"]
----
import io.jooby.json.GsonModule

{
  install(GsonModule())                             <1>

  get("/") {
    val myObject = ...;
    myObject                                        <2>
  }

  post("/") {
    val myObject = ctx.body<MyObject>()             <3>
    ...
  }
}
----

<1> Install Gson
<2> Use Jackson to encode arbitrary object as JSON
<3> Use Jackson to decode JSON to Java object. Client must specify the `Content-Type: application/json` header

=== Working with Gson

Access to default object mapper is available via require call:

.Default object mapper
[source, java, role="primary"]
----
import io.jooby.json.GsonModule;

{
  install(new GsonModule());

  Gson gson = require(Gson.class);
  
  ...
}
----

.Kotlin
[source, kt, role="secondary"]
----
import io.jooby.json.GsonModule

{
  install(GsonModule())

  val mapper = require<Gson>()
}
----

You can provide your own `Gson`:

.Custom ObjectMapper
[source, java, role="primary"]
----
import io.jooby.json.GsonModule;

{
  Gson gson = new GsonBuilder().create();

  install(new GsonModule(gson));
}
----

.Kotlin
[source, kt, role="secondary"]
----
import io.jooby.json.GsonModule

{
  val gson = GsonBuilder().create()

  install(GsonModule(gson))
}
----
