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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: ```swift if 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: ```swift if 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: ```swift let 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. ```swift let 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 error print(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`: ```ruby platform :ios, '8.0' use_frameworks! target 'MyApp' do pod '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 Manager You 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:4.0 import PackageDescription let 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 tree 2. for Workspaces, include the whole SwiftyJSON.xcodeproj ## Usage #### Initialization ```swift import SwiftyJSON ``` ```swift let json = JSON(data: dataFromNetworking) ``` Or ```swift let json = JSON(jsonObject) ``` Or ```swift if let dataFromString = jsonString.data(using: .utf8, allowLossyConversion: false) { let json = JSON(data: dataFromString) } ``` #### Subscript ```swift // Getting a double from a JSON Array let name = json[0].double ``` ```swift // Getting an array of string from a JSON Array let arrayNames = json["users"].arrayValue.map {$0["name"].stringValue} ``` ```swift // Getting a string from a JSON Dictionary let name = json["name"].stringValue ``` ```swift // Getting a string using a path to the element let path: [JSONSubscriptType] = [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 ``` ```swift // With a hard way let name = json[].string ``` ```swift // With a custom way let keys:[JSONSubscriptType] = [1,"list",2,"name"] let name = json[keys].string ``` #### Loop ```swift // If json is .Dictionary for (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 value for (index,subJson):(String, JSON) in json { // Do something you want } ``` #### Error ##### SwiftyJSON 4.x SwiftyJSON 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.x Use a subscript to get/set a value in an Array or Dictionary If 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. ```swift 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" } ``` ```swift 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" } ``` ```swift 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" } ``` #### Optional getter ```swift // NSNumber if let id = json["user"]["favourites_count"].number