How to retrieve data from file with SwiftyJSON

Swift 3/4 version:

let path = Bundle.main.path(forResource: "JSON", ofType: "json")!
let jsonString = try? String(contentsOfFile: path, encoding: String.Encoding.utf8)
let json = JSON(parseJSON: jsonString!)

Did you try with

let json = JSON(data: jsonData) // Note: data: parameter name
println(json["DDD"].string)