POST    /json                       @controllers.Application.saveJsonData

def saveJsonData = Action { request =>
  val body: AnyContext = request.body
  val jsonBody: Option[JsValue] = body.asJson
  jsonBody.map {json =>
    dao.persist(json) // stores in database, not found: dao
    Ok("Saved")
 }.getOrElse {
   BadRequest("Expecting text/json request.body")
  }
}

db.default.driver=org.postgresql.Driver
db.default.url="jdbc:postgresql://localhost:5432/database"
db.default.user=test
db.default.password=1234

val appDependencies = Seq(
    "org.postgresql" % "postgresql" % "9.4-1200-jdbc41",
    "postgresql" % "postgresql" % "9.1-901.jdbc4"
    )

(function() {
  var buttonValue = {};
  $("#submit").click(function() {
    $("input[type=button], input[type=file]").each(function($i) {
      var name = $(this).attr('name')
      buttonValue[name] = $(this).val();
    });
    console.log(JSON.stringify(buttonValue));//json object: [ex: {"firstButton":"button1","secondButton":"button2","file":"test.txt"} ], this json object should store in PostgreSQL database table as it is after clicking of Submit button.
  });
}())

<input type='submit' value='Submit Json' id='submitJson'>

create table saveJsonData(id integer primary key, content json);