How can I decode partially double serialized json string using `Codable` protocol?

Question

How can I decode partially double serialized json string using Codable protocol?

    class Person : Codable {
        var name : String?
        var         


        

Answer 1

If you can't fix your double encoded json you can provide your own custom decoder method to your PerfectFamily class but I recommend using a struct:

---

struct Person: Codable {
    let name: String
    let hobby: String
}

---

struct PerfectFamily: Codable {
    let person: Person
    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        let person = try container.decode([String: String].self)["person"] ?? ""
        self.person = try JSONDecoder().decode(Person.self, from: Data(person.utf8))
    }
}

---

let json = "{\"person\":\"{\\\"name\\\":\\\"Mike\\\",\\\"hobby\\\":\\\"fishing\\\"}\"}"

do {
    let person = try JSONDecoder().decode(PerfectFamily.self, from: Data(json.utf8)).person
    print(person)   // "Person(name: "Mike", hobby: "fishing")\n"
} catch {
    print(error)
}