Using SWAPI to test out Codable (Encodable/Decodable) for JSON in Swift 4.2

Codable-Example.swift

import Foundation

// Struct conforming to Codable and utilizing the CodingKeys enum to set up parameter to match how API data is organized.
struct Character: Codable {
    let name: String
    let height: String
    let mass: String
    let hairColor: String
    
    enum CodingKeys: String, CodingKey {
        case name
        case height
        case mass
        case hairColor = "hair_color"
    }
}

// Function to download data from SWAPI with URLSession and decode the JSON into a Character struct instance.
func downloadSWAPIData() {
    let randomNum = Int.random(in: 1...88)
    let swapiUrl = URL(string: "https://swapi.co/api/people/\(randomNum)")!
    
    URLSession.shared.dataTask(with: swapiUrl) { (data, response, error) in
        guard error == nil else { return }
        
        guard let data = data else { return }
        
        do {
            let decoder = JSONDecoder()
            let decodedData = try decoder.decode(Character.self, from: data)
            // decodedData is of type Character
        } catch {
            print(error.localizedDescription)
        }
    }.resume()
}

downloadSWAPIData()

// Encoding a Character struct instance into a JSON object.
let character = Character(name: "Kylo Ren", height: "189", mass: "120", hairColor: "brown")

do {
    let encoder = JSONEncoder()
    let encodedData = try encoder.encode(character)
    // encodedData is now a JSON object.
} catch {
    print(error.localizedDescription)
}