Codable Swift

codable.swift

struct Coordinate: Codable {

    var latitude: Double
    var longitude: Double
}

struct Landmark: Codable {
    var name: String
    var foundingYear: Int
    var location: Coordinate
    var vantagePoints: [Coordinate]

    enum CodingKeys: String, CodingKey {
        case name
        case foundingYear = "founding_date"

        case location
        case vantagePoints = "vantage_points"
    }
}

let landmarkJson = """
{
    "name": "Yosemite National Park",
    "founding_date": 1890,
    "location": {
        "longitude": 37.74896,
        "latitude": -119.58851
    },
    "vantage_points": [
        {
            "longitude": 38.18491,
            "latitude": -119.88604
        },
        {
            "longitude": 37.49379,
            "latitude": -119.19545
        }
    ]
}
""".data(using: .utf8)!

let decoder = JSONDecoder()
let product = try decoder.decode(Landmark.self, from: landmarkJson)

print(product)

let encoder = JSONEncoder()
let r = try encoder.encode(product)
print(String(data: r, encoding: .utf8))