swift struct to json

swift parse json

let string = #"{"name": "watashi", "number": 42, "pi": 3.141592, "array": [2, 3, 5, 7, 11, 13]}"#

let data = string.data(using: .utf8)!
let object = try! JSONSerialization.jsonObject(with: data, options: [])

let jsonObject = object as! [String: Any]

let nameField   = jsonObject["name"]    as? String
let numberField = jsonObject["number"]  as? Int
let piField     = jsonObject["pi"]      as? Double
let arrayField  = jsonObject["array"]   as? [Any]

print("The name argument is \(nameField)")
print("The number is \(numberField)")
print("The value of pi is \(piField)")
print("the array value is \(arrayField)")

Posted by: Guest on February-12-2020

struct Sentence : Codable { let sentence : String let lang : String } let sentences = [Sentence(sentence: "Hello world", lang: "en"), Sentence(sentence: "Hallo Welt", lang: "de")] do { let jsonData = try JSONEncoder().encode(sentences) let jsonString = String(data: jsonData, encoding: .utf8)! print(jsonString) // [{"sentence":"Hello world","lang":"en"},{"sentence":"Hallo Welt","lang":"de"}] // and decode it back let decodedSentences = try JSONDecoder().decode([Sentence].self, from: jsonData) print(decodedSentences) } catch { print(error) }

func json(from object:Any) -> String? { guard let data = try? JSONSerialization.data(withJSONObject: object, options: []) else { return nil } return String(data: data, encoding: String.Encoding.utf8) }

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