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# SwiftyJSON[](https://github.com/Carthage/Carthage)   [](https://houndci.com)SwiftyJSON makes it easy to deal with JSON data in Swift.Platform | Build Status---------| --------------|*OS | [](https://travis-ci.org/SwiftyJSON/SwiftyJSON) |[Linux](https://github.com/IBM-Swift/SwiftyJSON) | [](https://travis-ci.org/IBM-Swift/SwiftyJSON) |1. [Why is the typical JSON handling in Swift NOT good](#why-is-the-typical-json-handling-in-swift-not-good)2. [Requirements](#requirements)3. [Integration](#integration)4. [Usage](#usage)- [Initialization](#initialization)- [Subscript](#subscript)- [Loop](#loop)- [Error](#error)- [Optional getter](#optional-getter)- [Non-optional getter](#non-optional-getter)- [Setter](#setter)- [Raw object](#raw-object)- [Literal convertibles](#literal-convertibles)- [Merging](#merging)5. [Work with Alamofire](#work-with-alamofire)6. [Work with Moya](#work-with-moya)7. [SwiftyJSON Model Generator](#swiftyjson-model-generator)> [中文介绍](http://tangplin.github.io/swiftyjson/)## Why is the typical JSON handling in Swift NOT good?Swift is very strict about types. But although explicit typing is good for saving us from mistakes, it becomes painful when dealing with JSON and other areas that are, by nature, implicit about types.Take the Twitter API for example. Say we want to retrieve a user's "name" value of some tweet in Swift (according to [Twitter's API](https://developer.twitter.com/en/docs/tweets/timelines/api-reference/get-statuses-home_timeline)).The code would look like this:```swiftif let statusesArray = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [[String: Any]],let user = statusesArray[0]["user"] as? [String: Any],let username = user["name"] as? String {// Finally we got the username}```It's not good.Even if we use optional chaining, it would be messy:```swiftif let JSONObject = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [[String: Any]],let username = (JSONObject[0]["user"] as? [String: Any])?["name"] as? String {// There's our username}```An unreadable mess--for something that should really be simple!With SwiftyJSON all you have to do is:```swiftlet json = JSON(data: dataFromNetworking)if let userName = json[0]["user"]["name"].string {//Now you got your value}```And don't worry about the Optional Wrapping thing. It's done for you automatically.```swiftlet json = JSON(data: dataFromNetworking)let result = json[999999]["wrong_key"]["wrong_name"]if let userName = result.string {//Calm down, take it easy, the ".string" property still produces the correct Optional String type with safety} else {//Print the errorprint(result.error)}```## Requirements- iOS 8.0+ | macOS 10.10+ | tvOS 9.0+ | watchOS 2.0+- Xcode 8## Integration#### CocoaPods (iOS 8+, OS X 10.9+)You can use [CocoaPods](http://cocoapods.org/) to install `SwiftyJSON` by adding it to your `Podfile`:```rubyplatform :ios, '8.0'use_frameworks!target 'MyApp' dopod 'SwiftyJSON', '~> 4.0'end```#### Carthage (iOS 8+, OS X 10.9+)You can use [Carthage](https://github.com/Carthage/Carthage) to install `SwiftyJSON` by adding it to your `Cartfile`:```github "SwiftyJSON/SwiftyJSON" ~> 4.0```If you use Carthage to build your dependencies, make sure you have added `SwiftyJSON.framework` to the "Linked Frameworks and Libraries" section of your target, and have included them in your Carthage framework copying build phase.#### Swift Package ManagerYou can use [The Swift Package Manager](https://swift.org/package-manager) to install `SwiftyJSON` by adding the proper description to your `Package.swift` file:```swift// swift-tools-version:4.0import PackageDescriptionlet package = Package(name: "YOUR_PROJECT_NAME",dependencies: [.package(url: "https://github.com/SwiftyJSON/SwiftyJSON.git", from: "4.0.0"),])```Then run `swift build` whenever you get prepared.#### Manually (iOS 7+, OS X 10.9+)To use this library in your project manually you may:1. for Projects, just drag SwiftyJSON.swift to the project tree2. for Workspaces, include the whole SwiftyJSON.xcodeproj## Usage#### Initialization```swiftimport SwiftyJSON``````swiftlet json = JSON(data: dataFromNetworking)```Or```swiftlet json = JSON(jsonObject)```Or```swiftif let dataFromString = jsonString.data(using: .utf8, allowLossyConversion: false) {let json = JSON(data: dataFromString)}```#### Subscript```swift// Getting a double from a JSON Arraylet name = json[0].double``````swift// Getting an array of string from a JSON Arraylet arrayNames = json["users"].arrayValue.map {$0["name"].stringValue}``````swift// Getting a string from a JSON Dictionarylet name = json["name"].stringValue``````swift// Getting a string using a path to the elementlet path: [JSONSubscriptType] = [1,"list",2,"name"]let name = json[path].string// Just the samelet name = json[1]["list"][2]["name"].string// Alternativelylet name = json[1,"list",2,"name"].string``````swift// With a hard waylet name = json[].string``````swift// With a custom waylet keys:[JSONSubscriptType] = [1,"list",2,"name"]let name = json[keys].string```#### Loop```swift// If json is .Dictionaryfor (key,subJson):(String, JSON) in json {// Do something you want}```*The first element is always a String, even if the JSON is an Array*```swift// If json is .Array// The `index` is 0..<json.count's string valuefor (index,subJson):(String, JSON) in json {// Do something you want}```#### Error##### SwiftyJSON 4.xSwiftyJSON 4.x introduces an enum type called `SwiftyJSONError`, which includes `unsupportedType`, `indexOutOfBounds`, `elementTooDeep`, `wrongType`, `notExist` and `invalidJSON`, at the same time, `ErrorDomain` are being replaced by `SwiftyJSONError.errorDomain`.Note: Those old error types are deprecated in SwiftyJSON 4.x and will be removed in the future release.##### SwiftyJSON 3.xUse a subscript to get/set a value in an Array or DictionaryIf the JSON is:* an array, the app may crash with "index out-of-bounds."* a dictionary, it will be assigned to `nil` without a reason.* not an array or a dictionary, the app may crash with an "unrecognised selector" exception.This will never happen in SwiftyJSON.```swiftlet 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"}``````swiftlet 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"}``````swiftlet 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"}```#### Optional getter```swift// NSNumberif let id = json["user"]["favourites_count"].number {// Do something you want} else {// Print the errorprint(json["user"]["favourites_count"].error!)}``````swift// Stringif let id = json["user"]["name"].string {// Do something you want} else {// Print the errorprint(json["user"]["name"].error!)}``````swift// Boolif let id = json["user"]["is_translator"].bool {// Do something you want} else {// Print the errorprint(json["user"]["is_translator"].error!)}``````swift// Intif let id = json["user"]["id"].int {// Do something you want} else {// Print the errorprint(json["user"]["id"].error!)}...```#### Non-optional getterNon-optional getter is named `xxxValue````swift// If not a Number or nil, return 0let id: Int = json["id"].intValue``````swift// If not a String or nil, return ""let name: String = json["name"].stringValue``````swift// If not an Array or nil, return []let list: Array<JSON> = json["list"].arrayValue``````swift// If not a Dictionary or nil, return [:]let user: Dictionary<String, JSON> = json["user"].dictionaryValue```#### Setter```swiftjson["name"] = JSON("new-name")json[0] = JSON(1)``````swiftjson["id"].int = 1234567890json["coordinate"].double = 8766.766json["name"].string = "Jack"json.arrayObject = [1,2,3,4]json.dictionaryObject = ["name":"Jack", "age":25]```#### Raw object```swiftlet rawObject: Any = json.object``````swiftlet rawValue: Any = json.rawValue``````swift//convert the JSON to raw NSDatado {let rawData = try json.rawData()//Do something you want} catch {print("Error \(error)")}``````swift//convert the JSON to a raw Stringif let rawString = json.rawString() {//Do something you want} else {print("json.rawString is nil")}```#### Existence```swift// shows you whether value specified in JSON or notif json["name"].exists()```#### Literal convertiblesFor more info about literal convertibles: [Swift Literal Convertibles](http://nshipster.com/swift-literal-convertible/)```swift// StringLiteralConvertiblelet json: JSON = "I'm a json"``````swift/ /IntegerLiteralConvertiblelet json: JSON = 12345``````swift// BooleanLiteralConvertiblelet json: JSON = true``````swift// FloatLiteralConvertiblelet json: JSON = 2.8765``````swift// DictionaryLiteralConvertiblelet json: JSON = ["I":"am", "a":"json"]``````swift// ArrayLiteralConvertiblelet json: JSON = ["I", "am", "a", "json"]``````swift// With subscript in arrayvar json: JSON = [1,2,3]json[0] = 100json[1] = 200json[2] = 300json[999] = 300 // Don't worry, nothing will happen``````swift// With subscript in dictionaryvar json: JSON = ["name": "Jack", "age": 25]json["name"] = "Mike"json["age"] = "25" // It's OK to set Stringjson["address"] = "L.A." // Add the "address": "L.A." in json``````swift// Array & Dictionaryvar json: JSON = ["name": "Jack", "age": 25, "list": ["a", "b", "c", ["what": "this"]]]json["list"][3]["what"] = "that"json["list",3,"what"] = "that"let path: [JSONSubscriptType] = ["list",3,"what"]json[path] = "that"``````swift// With other JSON objectslet user: JSON = ["username" : "Steve", "password": "supersecurepassword"]let auth: JSON = ["user": user.object, // use user.object instead of just user"apikey": "supersecretapitoken"]```#### MergingIt is possible to merge one JSON into another JSON. Merging a JSON into another JSON adds all non existing values to the original JSON which are only present in the `other` JSON.If both JSONs contain a value for the same key, _mostly_ this value gets overwritten in the original JSON, but there are two cases where it provides some special treatment:- In case of both values being a `JSON.Type.array` the values form the array found in the `other` JSON getting appended to the original JSON's array value.- In case of both values being a `JSON.Type.dictionary` both JSON-values are getting merged the same way the encapsulating JSON is merged.In case, where two fields in a JSON have a different types, the value will get always overwritten.There are two different fashions for merging: `merge` modifies the original JSON, whereas `merged` works non-destructively on a copy.```swiftlet original: JSON = ["first_name": "John","age": 20,"skills": ["Coding", "Reading"],"address": ["street": "Front St","zip": "12345",]]let update: JSON = ["last_name": "Doe","age": 21,"skills": ["Writing"],"address": ["zip": "12342","city": "New York City"]]let updated = original.merge(with: update)// [// "first_name": "John",// "last_name": "Doe",// "age": 21,// "skills": ["Coding", "Reading", "Writing"],// "address": [// "street": "Front St",// "zip": "12342",// "city": "New York City"// ]// ]```## String representationThere are two options available:- use the default Swift one- use a custom one that will handle optionals well and represent `nil` as `"null"`:```swiftlet dict = ["1":2, "2":"two", "3": nil] as [String: Any?]let json = JSON(dict)let representation = json.rawString(options: [.castNilToNSNull: true])// representation is "{\"1\":2,\"2\":\"two\",\"3\":null}", which represents {"1":2,"2":"two","3":null}```## Work with [Alamofire](https://github.com/Alamofire/Alamofire)SwiftyJSON nicely wraps the result of the Alamofire JSON response handler:```swiftAlamofire.request(url, method: .get).validate().responseJSON { response inswitch response.result {case .success(let value):let json = JSON(value)print("JSON: \(json)")case .failure(let error):print(error)}}```We also provide an extension of Alamofire for serializing NSData to SwiftyJSON's JSON.See: [Alamofire-SwiftyJSON](https://github.com/SwiftyJSON/Alamofire-SwiftyJSON)## Work with [Moya](https://github.com/Moya/Moya)SwiftyJSON parse data to JSON:```swiftlet provider = MoyaProvider<Backend>()provider.request(.showProducts) { result inswitch result {case let .success(moyaResponse):let data = moyaResponse.datalet json = JSON(data: data) // convert network data to jsonprint(json)case let .failure(error):print("error: \(error)")}}```## SwiftyJSON Model GeneratorTools to generate SwiftyJSON Models* [JSON Cafe](http://www.jsoncafe.com/)* [JSON Export](https://github.com/Ahmed-Ali/JSONExport)