InfiniteRecursion

recursion.swift

struct Foo {
    let json: [Any]
}
extension Foo: Decodable {
    enum Keys: String, CodingKey {
        case json
    }
    init(from decoder: Decoder) throws {
        let cont = try decoder.container(keyedBy: Keys.self)
        json = try cont.decode(Array<Any>.self, forKey: .json)
    }
}

let json = """
{
   "json": [[ "a", "b", "C" ]]
}
""".data(using: .utf8)!

let obj = try? JSONDecoder().decode(Foo.self, from: json)