Codable4.swift

struct Photo: Codable
{
    //...Other properties (described in Code Snippet - 1)...
    
    //This property is not included in the CodingKeys enum and hence will not be encoded/decoded.
    var format: String = "png"
    
    enum CodingKeys: String, CodingKey
    {
        case title = "name"
        case url = "link"
        case isSample
        case metaData
        case type
        case size
    }
}