4 
let encoder = JSONEncoder()

do {
   let encodData = try encoder.encode("test string") // same as Int type
   print(encodData) // nil
} catch let err {
   print(err.localizedDescription) // The data couldn’t be written because it isn’t in the correct format.
}

how to encode these type value

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1 Answer 1

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The top-level (root) JSON object can only be an array or dictionary. For example:

do {
    let encoder = JSONEncoder()
    let encodData = try encoder.encode(["test string"])
    print(String(data: encodData, encoding: .utf8)!) 
    // ["test string"]

} catch {
    print(error.localizedDescription)
}
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