Swift 4 JSON Decodable with multidimensional and multitype array

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As you said, your json array is multi-type but you are trying to decode all into String. Default conformance of String to Decodable does not allow that. The only solution comes into my mind is to introduce new type.

struct IntegerOrString: Decodable {
    var value: Any

    init(from decoder: Decoder) throws {
        if let int = try? Int(from: decoder) {
            value = int
            return
        }

        value = try String(from: decoder)
    }
}

struct ChildrenTable: Decodable {
    var values: [[IntegerOrString]]?
}

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