Awesome Open Source
Awesome Open Source


GitRoyalty Platform: iOS, macOS, watchOS, tvOS Language: Swift 4.2 License: MIT


DynamicJSON is a dynamically typed JSON parser built upon the new @dynamicMemberLookup feature introduced by Chris Lattner in Swift 4.2. This allows us to access arbitrary object members which are resolved at runtime, allowing Swift to be as flexible as JavaScript when it comes to JSON.


if let jsonObject = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any],
   let user = jsonObject["user"] as? [String: Any],
   let username = user["username"] as? String {
	// ...


let username = JSON(data).user.username.string


Support DynamicJSON's contributors with a monthly subscription on to install this package.

Subscribe on GitRoyalty
* comes with a 2 week free trial and can be cancelled anytime


1. Initialize 🐣

Throw Anything into a JSON object to get started

let json = JSON(Data())
           JSON(["key": "value"])
           JSON(["element", 1])
           JSON("Hello world")

...or cast a literal as JSON

let json = "Hello world" as JSON
           123 as JSON
           [1, 2, 3] as JSON

let user: JSON = [
	"username": "Saoud",
	"age": 21,
	"address": [
	    "zip": "12345",
	    "city": "San Diego"

2. Drill in ⛏

Treat JSON objects like you're in JavaScript Land

let dictionary = json.dictionary
let array = json[0].cars.array
let string = json.users[1].username.string
let nsnumber =
let double = json[3][1].height.double
let int = json[0]
let bool = json.biography.isHuman.bool

Note how JSON doesn't actually have properties like cars or users, instead it uses dynamic member lookup to traverse through its associated JSON data to find the object you're looking for.

In case you have a key that's an actual property of JSON, like number or description for example, just use the string subscript accessor like so:

let number =["number"].number
let description = json.user.biography["description"].string

3. Have fun 🤪

JSON conforms to Comparable

let json1 = JSON(jsonData1)
let json2 = JSON(jsonData2)

// Equality applies to all types (Dictionary, Array, String, NSNumber, Bool, NSNull)
let isEqual = json1 == json2

// Less/greater than only applies to NSNumbers (Double, Int) and Strings
let isLessThan = json1 < json2
let isLessThanOrEqual = json1 <= json2
let isGreaterThan = json1 > json2
let isGreaterThanOrEqual = json1 >= json2

Pretty print for debug purposes


Convert to raw object

let anyObject = json.object

Convert to Data

let data = // optionally specify options...


DynamicJSON uses the MIT license. Please file an issue if you have any questions or if you'd like to share how you're using DynamicJSON.


DynamicJSON is in its infancy, but provides the barebones of a revolutionary new way to work with JSON in Swift. Please feel free to send pull requests of any features you think would add to DynamicJSON and its philosophy.


Contact me by email [email protected], or by twitter @sdrzn. Please create an issue if you come across a bug or would like a feature to be added.

Notable Mentions

Get A Weekly Email With Trending Projects For These Topics
No Spam. Unsubscribe easily at any time.
Swift (94,824
Ios (19,591
Macos (9,195
Swift4 (1,452
Ios Swift (1,160
Tvos (742
Watchos (591
Swift4 2 (42
Related Projects