Parsing JSON

Code Block 
import UIKit
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true
let url = URL(string: "https://api.nasa.gov/planetary/apod?api_key=DEMO_KEY")!
let task = URLSession.shared.dataTask(with: url) {
    (data, response, error) in
    if let data = data,
        let string = String(data: data, encoding: .utf8) {
        print(string)
    }
    PlaygroundPage.current.finishExecution()
}
task.resume()