if let statusesArray = try? NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments) as? [[String: AnyObject]],
    let user = statusesArray[0]["user"] as? [String: AnyObject],
    let username = user["name"] as? String {
    // Finally we got the username
}

if let JSONObject = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments) as? [[String: AnyObject]],
    let username = (JSONObject[0]["user"] as? [String: AnyObject])?["name"] as? String {
        // There's our username
}

let json = JSON(data: dataFromNetworking)
if let userName = json[0]["user"]["name"].string {
  //Now you got your value
}

let json = JSON(data: dataFromNetworking)
if let userName = json[999999]["wrong_key"]["wrong_name"].string {
    //Calm down, take it easy, the ".string" property still produces the correct Optional String type with safety
} else {
    //Print the error
    print(json[999999]["wrong_key"]["wrong_name"])
}

import PackageDescription

let package = Package(
    name: "YOUR_PROJECT_NAME",
    targets: [],
    dependencies: [
        .Package(url: "https://github.com/SwiftyJSON/SwiftyJSON.git", versions: "2.3.3" ..< Version.max)
    ]
)

import SwiftyJSON

let json = JSON(data: dataFromNetworking)

let json = JSON(jsonObject)

if let dataFromString = jsonString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) {
    let json = JSON(data: dataFromString)
}

//Getting a double from a JSON Array
let name = json[0].double

//Getting a string from a JSON Dictionary
let name = json["name"].stringValue

//Getting a string using a path to the element
let path = [1,"list",2,"name"]
let name = json[path].string
//Just the same
let name = json[1]["list"][2]["name"].string
//Alternatively
let name = json[1,"list",2,"name"].string

//With a hard way
let name = json[].string

//With a custom way
let keys:[SubscriptType] = [1,"list",2,"name"]
let name = json[keys].string

//If json is .Dictionary
for (key,subJson):(String, JSON) in json {
   //Do something you want
}

//If json is .Array
//The `index` is 0..<json.count's string value
for (index,subJson):(String, JSON) in json {
    //Do something you want
}

let json = JSON(["name", "age"])
if let name = json[999].string {
    //Do something you want
} else {
    print(json[999].error) // "Array[999] is out of bounds"
}

let json = JSON(["name":"Jack", "age": 25])
if let name = json["address"].string {
    //Do something you want
} else {
    print(json["address"].error) // "Dictionary["address"] does not exist"
}

let json = JSON(12345)
if let age = json[0].string {
    //Do something you want
} else {
    print(json[0])       // "Array[0] failure, It is not an array"
    print(json[0].error) // "Array[0] failure, It is not an array"
}

if let name = json["name"].string {
    //Do something you want
} else {
    print(json["name"])       // "Dictionary[\"name"] failure, It is not an dictionary"
    print(json["name"].error) // "Dictionary[\"name"] failure, It is not an dictionary"
}

//NSNumber
if let id = json["user"]["favourites_count"].number {
   //Do something you want
} else {
   //Print the error
   print(json["user"]["favourites_count"].error)
}

//String
if let id = json["user"]["name"].string {
   //Do something you want
} else {
   //Print the error
   print(json["user"]["name"])
}

//Bool
if let id = json["user"]["is_translator"].bool {
   //Do something you want
} else {
   //Print the error
   print(json["user"]["is_translator"])
}

//Int
if let id = json["user"]["id"].int {
   //Do something you want
} else {
   //Print the error
   print(json["user"]["id"])
}
...

//If not a Number or nil, return 0
let id: Int = json["id"].intValue

//If not a String or nil, return ""
let name: String = json["name"].stringValue

//If not a Array or nil, return []
let list: Array<JSON> = json["list"].arrayValue

//If not a Dictionary or nil, return [:]
let user: Dictionary<String, JSON> = json["user"].dictionaryValue

json["name"] = JSON("new-name")
json[0] = JSON(1)

json["id"].int =  1234567890
json["coordinate"].double =  8766.766
json["name"].string =  "Jack"
json.arrayObject = [1,2,3,4]
json.dictionary = ["name":"Jack", "age":25]

let jsonObject: AnyObject = json.object

if let jsonObject: AnyObject = json.rawValue

//convert the JSON to raw NSData
if let data = json.rawData() {
    //Do something you want
}

//convert the JSON to a raw String
if let string = json.rawString() {
    //Do something you want
}

//shows you whether value specified in JSON or not
if json["name"].isExists()

//StringLiteralConvertible
let json: JSON = "I'm a json"

//IntegerLiteralConvertible
let json: JSON =  12345

//BooleanLiteralConvertible
let json: JSON =  true

//FloatLiteralConvertible
let json: JSON =  2.8765

//DictionaryLiteralConvertible
let json: JSON =  ["I":"am", "a":"json"]

//ArrayLiteralConvertible
let json: JSON =  ["I", "am", "a", "json"]

//NilLiteralConvertible
let json: JSON =  nil

//With subscript in array
var json: JSON =  [1,2,3]
json[0] = 100
json[1] = 200
json[2] = 300
json[999] = 300 //Don't worry, nothing will happen

//With subscript in dictionary
var json: JSON =  ["name": "Jack", "age": 25]
json["name"] = "Mike"
json["age"] = "25" //It's OK to set String
json["address"] = "L.A." // Add the "address": "L.A." in json

//Array & Dictionary
var json: JSON =  ["name": "Jack", "age": 25, "list": ["a", "b", "c", ["what": "this"]]]
json["list"][3]["what"] = "that"
json["list",3,"what"] = "that"
let path = ["list",3,"what"]
json[path] = "that"

Alamofire.request(.GET, url).validate().responseJSON { response in
    switch response.result {
    case .Success:
        if let value = response.result.value {
          let json = JSON(value)
          print("JSON: \(json)")
        }
    case .Failure(let error):
        print(error)
    }
}