[Solved] Parse complex json code

Question

The problem is merely that your structs look nothing at all like your JSON!

Your JSON is a dictionary whose keys have names like "-8802586561990153106-1804221538-5" and "8464567322535526441-1804221546-15". But I don’t see you declaring any struct that deals with those keys.

Then each of those turns out to be a dictionary with keys like "zug", "ankunft", and "abfahrt". But I don’t see you declaring any struct that deals with those keys either.

And then the "zug" has keys "klasse" and "nummer"; you don’t have those either.

And so on.

Either your structs must look exactly like your JSON, or else you must define CodingKeys and possibly also implement init(from:) to deal with any differences between your structs and your JSON. I suspect that the keys "-8802586561990153106-1804221538-5" and "8464567322535526441-1804221546-15" are unpredictable, so you will probably have to write init(from:) in order to deal with them.

For example, I was able to decode your JSON like this (I do not really recommend using try!, but we decoded without error and it’s just a test):

    struct Entry : Codable {
        let zug : Zug
        let ankunft : AnkunftAbfahrt
        let abfahrt : AnkunftAbfahrt
    }
    struct Zug : Codable {
        let klasse : String
        let nummer : String
    }
    struct AnkunftAbfahrt : Codable {
        let zeitGeplant : String
        let zeitAktuell : String
        let routeGeplant : [String]
    }
    struct Top : Decodable {
        var entries = [String:Entry]()
        init(from decoder: Decoder) throws {
            struct CK : CodingKey {
                var stringValue: String
                init?(stringValue: String) {
                    self.stringValue = stringValue
                }
                var intValue: Int?
                init?(intValue: Int) {
                    return nil
                }
            }
            let con = try! decoder.container(keyedBy: CK.self)
            for key in con.allKeys {
                self.entries[key.stringValue] = 
                    try! con.decode(Entry.self, forKey: key)
            }
        }
    }
    // d is a Data containing your JSON
    let result = try! JSONDecoder().decode(Top.self, from: d)

Accepted Answer