Convert Json to Array in Swift 5

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All the examples I find are using dictionary types, for example: user: x, book: y

but how can I convert this type of Json which doesn't contain a key?

["1","137","56","56"]

This is of type String?

I tried:

struct Candidate: Decodable {
    var S: String?
}

let chainsAllowed = ["1","137","56","56"]

let jsonObjectData = chainsAllowed.data(using: .utf8)!
let candidate = try? JSONDecoder().decode(
    Candidate.self,
    from: jsonObjectData
)

but I get nil. How can I convert it into an array?

Thanks

swift
1 Answers

Do this:

import Foundation

let chainsAllowed = #"["1","137","56","56"]"#

let jsonObjectData = chainsAllowed.data(using: .utf8)
let candidate = try? JSONDecoder().decode(
    [String].self,
    from: jsonObjectData!
)

print(candidate!)

Output:

["1", "137", "56", "56"]

For your information: An array is actually perfectly valid JSON. In fact, a JSON text can be any of false / null / true / object / array / number / string. See https://datatracker.ietf.org/doc/html/rfc8259#section-2

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