Convert Json string to Json object in Swift 4

Question

I try to convert JSON string to a JSON object but after JSONSerialization the output is nil in JSON   Response String       form id   3465   canonical name     df SAWERQ     form name     Activity 4 with Images     form desc   null     I try to convert this string with my code below   let jsonString   response result value let data  Data    jsonString  data using   utf8  let json    try  JSONSerialization jsonObject with  data  options       as   String AnyObject   print json     Empty Data

User · Answer

I used below code and it s working fine for me    let jsonText    quot    quot userName  quot    quot Bhavsang  quot   quot  var dictonary NSDictionary       if let data   jsonText dataUsingEncoding NSUTF8StringEncoding                  do               dictonary    try NSJSONSerialization JSONObjectWithData data  options    allowFragments   as   String AnyObject                       if let myDictionary   dictonary                                   print  quot  User name is    myDictionary  quot userName quot     quot                                 catch let error as NSError                            print error

User · Answer

Using JSONSerialization always felt unSwifty and unwieldy  but it is even more so with the arrival of Codable in Swift 4  If you wield a  String Any  in front of a simple struct it will     hurt  Check out this in a Playground   import Cocoa  let data        form id   3465   canonical name     df SAWERQ     form name     Activity 4 with Images     form desc   null    data using   utf8    struct Form  Codable       let id  Int     let name  String     let description  String       private enum CodingKeys  String  CodingKey           case id    form id          case name    form name          case description    form desc           do       let f   try JSONDecoder   decode  Form  self  from  data      print f      print f 0     catch       print error      With minimal effort handling this will feel a whole lot more comfortable  And you are given a lot more information if your JSON does not parse properly

User · Answer

The problem is that you thought your jsonString is a dictionary  It s not    It s an array of dictionaries   In raw json strings  arrays begin with   and dictionaries begin with       I used your json string with below code    let string        form id   3465   canonical name     df SAWERQ     form name     Activity 4 with Images     form desc   null    let data   string data using   utf8   do       if let jsonArray   try JSONSerialization jsonObject with  data  options    allowFragments  as   Dictionary lt String Any gt                print jsonArray     use the json here            else           print  bad json           catch let error as NSError       print error      and I am getting the output       form desc    lt null gt    form name   Activity 4 with Images   canonical name   df SAWERQ   form id   3465

User · Answer

I tried the solutions here  and as   String AnyObject  worked for me   do      if let json   stringToParse data using  String Encoding utf8           if let jsonData   try JSONSerialization jsonObject with  json  options   allowFragments  as   String AnyObject               let id   jsonData  id   as  String                                  catch       print error localizedDescription

[ios] Convert Json string to Json object in Swift 4

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