//It is generally nicest to make the variables in your codable types optional, so your decoding can still succeed
//  even if the JSON is missing 1 or more fields

struct MyCodableType: Codable {
  var myVar1: String?
  var myVar2: [Bool]?
  var myVar3: SomeOtherCodableType?

  //A CodingKeys enum is required if your variable names don't match the JSON names, case-sensitive.
  //  The cases here should match your clientside variable names, and the associated values should match the JSON
  enum CodingKeys: String, CodingKey {
    case myVar1 = "JSONThing"
    case myVar2 = "OtherJSONThing"
    case myVar4 = "YetAnother"
  }
}

struct SomeOtherCodableType: Codable {
 var bestFood: String?
}