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https://github.com/freshos/arrow

🏹 Parse JSON with style
https://github.com/freshos/arrow

arrow decoding freshos ios json json-parsing mapping micro-framework objectmapper simple swift swiftyjson type-inference unbox

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🏹 Parse JSON with style

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README 

        
![Arrow](https://raw.githubusercontent.com/freshOS/Arrow/master/banner.png)



# Arrow



[![Language: Swift 6](https://img.shields.io/badge/language-swift6-f48041.svg?style=flat)](https://developer.apple.com/swift)

![Platform: iOS 8+](https://img.shields.io/badge/platform-iOS%208%2B-blue.svg?style=flat)

[![SPM compatible](https://img.shields.io/badge/SPM-compatible-4BC51D.svg?style=flat)](https://swift.org/package-manager)

[![Build Status](https://app.bitrise.io/app/57b6b1b8959ef398/status.svg?token=WBTcuBRgfLeDB6-A3j7gFA)](https://app.bitrise.io/app/57b6b1b8959ef398)

[![codebeat badge](https://codebeat.co/badges/f037ac0c-b3d9-4132-9fca-64150a908113)](https://codebeat.co/projects/github-com-freshos-arrow)

[![License: MIT](http://img.shields.io/badge/license-MIT-lightgrey.svg?style=flat)](https://github.com/freshOS/Arrow/blob/master/LICENSE)

![Release version](https://img.shields.io/github/release/freshos/Arrow.svg)



[Reason](#reason) - [Example](#example) - [Installation](#installation)



```swift

identifier <-- json["id"]

name <-- json["name"]

stats <-- json["stats"]

```



Because parsing JSON in Swift is full of **unecessary if lets, obvious casts and nil-checks**  

*There must be a better way*



## Try it



Arrow is part of [freshOS](https://freshos.github.io/) iOS toolset. Try it in an example App! Download Starter Project



## How

By using a simple arrow operator that takes care of the boilerplate code for us.  

Json mapping code becomes **concise** and **maintainable** ❤️



## Why use Arrow

- [x] Infers types

- [x] Leaves your models clean

- [x] Handles custom & nested models

- [x] Dot and array syntax

- [x] Pure Swift, Simple & Lightweight



## Example



### Swift Model

```swift

struct Profile {

    var identifier = 0

    var name = ""

    var link:NSURL?

    var weekday:WeekDay = .Monday

    var stats = Stats()

    var phoneNumbers = [PhoneNumber]()

}

```

### JSON File

```json

{

    "id": 15678,

    "name": "John Doe",

    "link": "https://apple.com/steve",

    "weekdayInt" : 3,

    "stats": {

        "numberOfFriends": 163,

        "numberOfFans": 10987

    },

    "phoneNumbers": [{

                     "label": "house",

                     "number": "9809876545"

                     }, {

                     "label": "cell",

                     "number": "0908070656"

                     }, {

                     "label": "work",

                     "number": "0916570656"

    }]

}

```



### Before (Chaos)

```swift

var profile = Profile()



// Int

if let id = json["id"] as? Int {

    profile.identifier = id

}  

// String

if let name = json["name"] as? String {

    profile.name = name

}

// NSURL

if let link = json["link"] as? String, url = NSURL(string:link)  {

    profile.link = link

}

// Enum

if let weekdayInt = json["weekdayInt"] as? Int, weekday = WeekDay(rawValue:weekdayInt) {

    profile.weekday = weekday

}

// Custom nested object

if let statsJson = json["stats"] as? AnyObject {

    if let numberOfFans = statsJson["numberOfFans"] as? Int {

        profile.stats.numberOfFans = numberOfFans

    }

    if let numberOfFriends = statsJson["numberOfFriends"] as? Int {

        profile.stats.numberOfFriends = numberOfFriends

    }

}

// Array of custom nested object

if let pns = json["phoneNumbers"] as? [AnyObject] {

    for pn in pns {

        phoneNumbers.append(PhoneNumber(json: pn))

    }

}

```



### After  🎉🎉🎉

```swift

extension Profile:ArrowParsable {

    mutating func deserialize(_ json: JSON) {

        identifier <-- json["id"]

        link <-- json["link"]

        name <-- json["name"]

        weekday <-- json["weekdayInt"]

        stats <- json["stats"]

        phoneNumbers <-- json["phoneNumbers"]

    }

}

```



### Usage

```swift

let profile = Profile()

profile.deserialize(json)

```



## Installation

The Swift Package Manager (SPM) is now the official way to install `Arrow`. The other package managers are now deprecated as of `5.1.2` and won't be supported in future versions.



#### Swift Package Manager



`Xcode` > `File` > `Swift Packages` > `Add Package Dependency...` > `Paste` `https://github.com/freshOS/Arrow`



#### Carthage - Deprecated

```

github "freshOS/Arrow"

```

#### CocoaPods - Deprecated

```

target 'MyApp'

pod 'Arrow'

use_frameworks!

```



## How Does That Work



Notice earlier we typed :



```swift

stats <-- json["stats"]

```

That's because we created and extension "Stats+Arrow.swift" enabling us to use the Arrow Operator



```swift

//  Stats+Arrow.swift



import Foundation



extension Stats:ArrowParsable {

    mutating func deserialize(json: JSON) {

        numberOfFriends <-- json["numberOfFriends"]

        numberOfFans <-- json["numberOfFans"]

    }

}

```



## Flexible you said



- DO I have to use the <-- for my sub models

- Nope, you could write it like so if you wanted :



```swift

stats.numberOfFriends <-- json["stats.numberOfFriends"]

stats.numberOfFans <-- json["stats.numberOfFans"]

```



## Date Parsing



### Globally



```swift

// Configure Global Date Parsing with one of those

Arrow.setDateFormat("yyyy-MM-dd'T'HH:mm:ssZZZZZ")

Arrow.setUseTimeIntervalSinceReferenceDate(true)

Arrow.setDateFormatter(aDateFormatter)



// Then later dates can be parsed form custom date format or timestamps automatically 🎉

let json:JSON = JSON(["date": "2013-06-07T16:38:40+02:00", "timestamp": 392308720])

date1 <-- json["date"]

date2 <-- json["timestamp"]

```



### On a per-key basis

```swift

createdAt <-- json["created_at"]?.dateFormat("yyyy-MM-dd'T'HH:mm:ssZZZZZ")

createdAt <-- json["created_at"]?.dateFormatter(aCustomDateFormatter)

```

Just provide it on a case per case basis ! 🎉



## Accessing JSON values



### Nested values



```swift

value <-- json["nested.nested.nested.nestedValue"]

```



### Object at index

```swift

value <-- json[12]

```



### Combine both

```swift

value <-- json[1]?["someKey"]?[2]?["something.other"]

```



### Looping on Array

```swift

if let collection = json.collection {

    for jsonEntry in collection {

        //Do something

    }

}

```



## Swift Version



- Swift 2 -> version [**2.0.3**](https://github.com/freshOS/Arrow/releases/tag/2.0.3)

- Swift 3 -> version [**3.0.5**](https://github.com/freshOS/Arrow/releases/tag/3.0.5)

- Swift 4 -> version [**4.0.0**](https://github.com/freshOS/Arrow/releases/tag/4.0.0)

- Swift 4.1 -> version [**4.1.0**](https://github.com/freshOS/Arrow/releases/tag/4.1.0)

- Swift 4.2 -> version [**4.2.0**](https://github.com/freshOS/Arrow/releases/tag/4.2.0)

- Swift 5.0 -> version [**5.0.0**](https://github.com/freshOS/Arrow/releases/tag/5.0.0)

- Swift 5.1 -> version [**5.1.0**](https://github.com/freshOS/Arrow/releases/tag/5.1.0)

- Swift 5.1.3 -> version [**5.1.1**](https://github.com/freshOS/Arrow/releases/tag/5.1.1)

- Swift 5.3 -> version [**6.0.0**](https://github.com/freshOS/Arrow/releases/tag/6.0.0)



## Acknowledgements

This wouldn't exist without [YannickDot](https://github.com/YannickDot), [Damien-nd](https://github.com/damien-nd) and [maxkonovalov](https://github.com/maxkonovalov)



### Backers

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