Codable with renamed parameters

Codable+RenamedParameters.swift

import UIKit

struct Country: Codable {
    let name: String
    let capital: String
    let alternateSpellings: [String]
    
    enum CodingKeys: String, CodingKey {
        case name
        case capital
        
        // Map `altSpellings` from JSON to proper property name `alternateSpellings`
        case alternateSpellings = "altSpellings"
    }
}

let jsonData: Data = """
{
    "name": "United States of America",
    "capital": "Washington, D.C.",
    "callingCodes": ["1"],
    "region": "Americas",
    "subregion": "Northern America",
    "population": 323947000,
    "area": 9629091,
    "borders": ["CAN", "MEX"],
    "altSpellings": ["US", "USA","United States of America"]
}
""".data(using: .utf8)!

let country = try! JSONDecoder().decode(Country.self, from: jsonData)

print("Country alternate spellings: \(country.alternateSpellings)")