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Xcode playground - Swift 4 not receiving the JSON data

Hi I am working in Xcode playground and trying to use API http-get request using URLSession with the dummy data from jsonplaceholder website.

See code below. The code doesn't return an error but I was expecting data in "usableData" and print it. And the data is :

URL: http://jsonplaceholder.typicode.com/users/1 { Status Code: 200, Headers {n "Access-Control-Allow-Credentials" = (n truen );n "CF-Cache-Status" = (n HITn );n "CF-RAY" = (n "445f3d1003761d3e-MEL"n );n "Cache-Control" = (n "public, max-age=14400"n );n Connection = (n "keep-alive"n );n "Content-Encoding" = (n gzipn );n "Content-Type" = (n "application/json; charset=utf-8"n );n Date = (n "Mon, 06 Aug 2018 05:52:38 GMT"n );n Etag = (n "W/"1fd-+2Y3G3w049iSZtw5t1mzSnunngE""n );n Expires = (n "Mon, 06 Aug 2018 09:52:38 GMT"n );n Pragma = (n "no-cache"n );n Server = (n cloudflaren );n "Transfer-Encoding" = (n Identityn );n Vary = (n "Origin, Accept-Encoding"n );n Via = (n "1.1 ve…"

I was expecting some JSON formated data along the lines of :


"id": 1,
"name": "Leanne Graham",
"username": "Bret",
"email": "Sincere@april.biz",
"address":
"street": "Kulas Light",
"suite": "Apt. 556",
"city": "Gwenborough",
"zipcode": "92998-3874",
"geo":
"lat": "-37.3159",
"lng": "81.1496"

,
"phone": "1-770-736-8031 x56442",
"website": "hildegard.org",
"company":
"name": "Romaguera-Crona",
"catchPhrase": "Multi-layered client-server neural-net",
"bs": "harness real-time e-markets"




At this phase I am only interested in getting the data and not parsing it yet.

What am I doing wrong? Any help is welcome. thank you.

---- START CODE ---------------

import PlaygroundSupport
import Foundation
PlaygroundPage.current.needsIndefiniteExecution = true

let urlString = URL(string:"http://jsonplaceholder.typicode.com/users/1")

if let url = urlString
let task = URLSession.shared.dataTask(with: url) (data, response, error) in
if error != nil
print()
else
if let usableData = data
print(usableData) //JSONSerialization



task.resume()



"509 bytes"

if let usableData

data

2 Answers
2

You have to use Foundation class, NSJSONSerialization for converting json data which you get from your api into an object. So you can use line below:

let usableData = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &error) as NSDictionary
print(usableData)


Codable

JSONDecoder

NSJSONSerialization

Codable

Your code is fine. If you want to see the JSON data printed as a String, you need to convert the bytes from data to a String:

data

if let usableData = data
let str = String(bytes: data, encoding: .utf8)
print("(String(describing: str))") // just for debug output



Note that this is not necessary for parsing, you'd do something along the lines of

struct User: Codable
let id: Int
let name, username, email: String
let address: Address
let phone, website: String
let company: Company


struct Address: Codable
let street, suite, city, zipcode: String
let geo: Geo


struct Geo: Codable
let lat, lng: String


struct Company: Codable
let name, catchPhrase, bs: String


if let usableData = data
try
let user = try JSONDecoder().decode(User.self, from: data)
catch
print("(error)"




for that

print("(String(describing: str))")

nil

print(str!)

data

http://jsonplaceholder.typicode.com/users/1

describing

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