Simple and clean way to convert JSON string to Object in Swift

Question

I have been searching for days to convert a fairly simple JSON string to an object type in Swift but with no avail    Here is the code for web service call   func GetAllBusiness              Alamofire request  GET   http   MyWebService    responseString    request  response  string  error  in                  println string                 I have a swift struct Business swift   struct Business       var Id   Int   0     var Name          var Latitude          var Longitude          var Address          Here is my test service deployed               Id   1       Name    A        Latitude    -35 243256        Longitude    149 110701        Address   null               Id   2       Name    B        Latitude    -35 240592        Longitude    149 104843        Address   null               It would be a delight if someone guide me through this   Thanks

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For Swift 4  i wrote this extension using the Codable protocol   struct Business  Codable       var id  Int     var name  String    extension String        func parse lt D gt  to type  D Type  - gt  D  where D  Decodable            let data  Data   self data using   utf8            let decoder   JSONDecoder            do               let  object   try decoder decode type  from  data              return  object            catch               return nil                    var jsonString      n           n           id   72  n           name     Batata Cremosa    n            n           n           id   183  n           name     Caldeirada de Peixes    n            n           n           id   76  n           name     Batata com Cebola e Ervas    n            n           n           id   56  n           name     Arroz de forma    n          let businesses   jsonString parse to   Business  self

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Here s a sample for you to make things simpler and easier  My String data in my database is a JSON file that looks like this      stype   noun   sdsc   careless disregard for consequences   swds   disregard  freedom  impulse  licentiousness  recklessness  spontaneity  thoughtlessness  uninhibitedness  unrestraint  wantonness  wildness   anwds   restraint  self-restraint     stype   verb   sdsc   leave behind  relinquish   swds   abdicate  back out  bail out  bow out  chicken out  cop out  cut loose  desert  discard  discontinue  ditch  drop  drop out  duck  dump  dust  flake out  fly the coop  give up the ship  kiss goodbye  leave  leg it  let go  opt out  pull out  quit  run out on  screw  ship out  stop  storm out  surrender  take a powder  take a walk  throw over  vacate  walk out on  wash hands of  withdraw  yield   anwds   adopt  advance  allow  assert  begin  cherish  come  continue  defend  favor  go  hold  keep  maintain  persevere  pursue  remain  retain  start  stay  support  uphold     stype   verb   sdsc   leave in troubled state   swds   back out  desert  disown  forsake  jilt  leave  leave behind  quit  reject  renounce  throw over  walk out on   anwds   adopt  allow  approve  assert  cherish  come  continue  defend  favor  keep  pursue  retain  stay  support  uphold      To load this JSON String Data  follow these simple Steps  First  create a class for my MoreData Object like this   class  MoreData   public private set  var stype   String public private set  var sdsc   String public private set  var swds   String public private set  var anwds   String  init  stype   String  sdsc   String  swds   String  anwds   String         self stype   stype     self sdsc   sdsc     self swds   swds     self anwds   anwds      Second  create my String extension for my JSON String like this   extension  String   func toJSON   - gt  Any        guard let data   self data using   utf8  allowLossyConversion  false  else   return nil       return try  JSONSerialization jsonObject with  data  options   mutableContainers       Third  create My Srevices Class to handle my String Data like this   class Services   static let instance  Services   Services    func loadMoreDataByString byString  String  - gt   MoreData       var  myVariable    MoreData         guard let ListOf   byString toJSON   as    String  AnyObject   else   return            for object in ListOf           let stype    object  stype   as  String               let sdsc    object  sdsc   as  String                let swds    object  swds   as  String               let anwds    object  anwds   as  String                let myMoreData   MoreData stype   stype  sdsc   sdsc  swds   swds  anwds   anwds          myVariable append myMoreData            return myVariable      Finally  call this Function from the View Controller to load data in the table view like this       func handlingJsonStringData        moreData removeAll keepingCapacity  false      moreData    Services instance loadMoreDataByString byString  jsonString      print self moreData count      tableView reloadData

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let jsonString       id   123   Name     Munish       Convert String to NSData   var data  NSData  jsonString dataUsingEncoding NSUTF8StringEncoding     var error  NSError    Convert NSData to AnyObject  var jsonObject  AnyObject    NSJSONSerialization JSONObjectWithData data      options  NSJSONReadingOptions allZeros  error   amp error   println  Error     error     let id    jsonObject as  NSDictionary   id   as  Int  let name    jsonObject as  NSDictionary   name   as  String  println  Id     id     println  Name     name

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for swift 3 4  extension String       func toJSON   - gt  Any            guard let data   self data using   utf8  allowLossyConversion  false  else   return nil           return try  JSONSerialization jsonObject with  data  options   mutableContainers            Example Usage    let dict   myString toJSON   as   String AnyObject     can be any type here

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Here are some tips how to begin with simple example    Consider you have following JSON Array String  similar to yours  like    var list Array lt Business gt             left only 2 fields for demo   struct Business       var id   Int   0     var name                          var jsonStringAsArray      n               n               id   72  n               name     Batata Cremosa    n                            n               n               id   183  n               name     Caldeirada de Peixes    n                            n               n               id   76  n               name     Batata com Cebola e Ervas    n                            n               n               id   56  n               name     Arroz de forma    n                                      convert String to NSData         var data  NSData   jsonStringAsArray dataUsingEncoding NSUTF8StringEncoding           var error  NSError              convert NSData to  AnyObject          let anyObj  AnyObject    NSJSONSerialization JSONObjectWithData data  options  NSJSONReadingOptions 0               error   amp error          println  Error    error             convert  AnyObject  to Array lt Business gt       list   self parseJson anyObj                                func parseJson anyObj AnyObject  - gt  Array lt Business gt            var list Array lt Business gt                 if  anyObj is Array lt AnyObject gt                 var b Business   Business                for json in anyObj as Array lt AnyObject gt                b name    json  name   as AnyObject  as  String           to get rid of null              b id      json  id    as AnyObject  as  Int     0                                  list append b                  for               if        return list         func        EDIT   To get rid of null changed to   b name    json  name   as AnyObject  as  String        b id      json  id    as AnyObject  as  Int     0    See also Reference of Coalescing Operator  aka      Hope it will help you to sort things out

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As simple String extension should suffice   extension String        var parseJSONString  AnyObject             let data   self dataUsingEncoding NSUTF8StringEncoding  allowLossyConversion  false           if let jsonData   data                  Will return an object or nil if JSON decoding fails             return NSJSONSerialization JSONObjectWithData jsonData  options  NSJSONReadingOptions MutableContainers  error  nil            else                  Lossless conversion of the string was not possible             return nil                     Then   var jsonString      n           n           id   72  n           name     Batata Cremosa    n                        n           n           id   183  n           name     Caldeirada de Peixes    n                        n           n           id   76  n           name     Batata com Cebola e Ervas    n                        n           n           id   56  n           name     Arroz de forma    n                      let json  AnyObject    jsonString parseJSONString println  Parsed JSON    json     println  json 3     json  3         Output   Parsed JSON              id   72      name    Batata Cremosa                    id   183      name    Caldeirada de Peixes                    id   76      name    Batata com Cebola e Ervas                    id   56      name    Arroz de forma            json 3         id   56      name    Arroz de forma

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I wrote a library which makes working with json data and deserialization a breeze in Swift  You can get it here  https   github com isair JSONHelper  Edit  I updated my library  you can now do it with just this   class Business  Deserializable       var id  Int      var name    N A      This one has a default value       required init data   String  AnyObject             id  lt -- data  id           name  lt -- data  name            var businesses   Business     Alamofire request  GET   http   MyWebService    responseString    request  response  string  error  in     businesses  lt -- string     Old Answer   First  instead of using  responseString  use  response to get a response object  Then change your code to   func getAllBusinesses          Alamofire request  GET   http   MyWebService    response    request  response  data  error  in         var businesses   Business            businesses  lt -- data          if businesses    nil                  Data was not structured as expected and deserialization failed  do something            else                  Do something with your businesses array                       And you need to make a Business class like this   class Business  Deserializable       var id  Int      var name    N A      This one has a default value       required init data   String  AnyObject             id  lt -- data  id           name  lt -- data  name             You can find the full documentation on my GitHub repo  Have fun

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For Swift 4  I used  Passkit s logic but i had to update as per Swift 4    Step 1 Created extension for String Class  import UIKit   extension String               var parseJSONString  AnyObject                        let data   self data using  String Encoding utf8  allowLossyConversion  false               if let jsonData   data                                  Will return an object or nil if JSON decoding fails                 do                                       let message   try JSONSerialization jsonObject with  jsonData  options  mutableContainers                      if let jsonResult   message as  NSMutableArray                                               print jsonResult                           return jsonResult   Will return the json array output                                           else                                               return nil                                                         catch let error as NSError                                       print  An error occurred    error                        return nil                                             else                                  Lossless conversion of the string was not possible                 return nil                                   Step 2 This is how I used in my view controller  var jsonString      n           n           id   72  n           name     Batata Cremosa    n                        n           n           id   183  n           name     Caldeirada de Peixes    n                        n           n           id   76  n           name     Batata com Cebola e Ervas    n                        n           n           id   56  n           name     Arroz de forma    n                         Convert jsonString to jsonArray  let json  AnyObject    jsonString parseJSONString print  Parsed JSON    json     print  json 2     json  2       All credit goes to original user  I just updated for latest swift version

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Swift 4 parses JSON much more elegantly  Just adopt the codable protocol for your structure as per this simplified example    struct Business  Codable       let id  Int     let name  String     To parse the JSON array  you tell the decoder what the objects of the data array are  let parsedData   decoder decode  Business  self  from  data    Here s a full working example    import Foundation  struct Business  Codable       let id  Int     let name  String       Generating the example JSON data   let originalObjects    Business id  0  name   A    Business id  1  name   B    let encoder   JSONEncoder   let data   try  encoder encode originalObjects      Parsing the data   let decoder   JSONDecoder   let parsedData   try  decoder decode  Business  self  from  data    For more background  check out this excellent guide

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You can use swift quicktype io for converting JSON to either struct or class  Even you can mention version of swift to genrate code   Example JSON         message    Hello  World       Generated code   import Foundation  typealias Sample   OtherSample  struct OtherSample  Codable       let message  String       Serialization extensions  extension OtherSample       static func from json  String  using encoding  String Encoding    utf8  - gt  OtherSample            guard let data   json data using  encoding  else   return nil           return OtherSample from data  data             static func from data  Data  - gt  OtherSample            let decoder   JSONDecoder           return try  decoder decode OtherSample self  from  data             var jsonData  Data            let encoder   JSONEncoder           return try  encoder encode self             var jsonString  String            guard let data   self jsonData else   return nil           return String data  data  encoding   utf8           extension OtherSample       enum CodingKeys  String  CodingKey           case message

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It might be help someone  Similar example  This is our Codable class to bind data  You can easily create this class using SwiftyJsonAccelerator  class ModelPushNotificationFilesFile  Codable      enum CodingKeys  String  CodingKey       case url     case id     case fileExtension    quot file extension quot      case name        var url  String    var id  Int    var fileExtension  String    var name  String     init  url  String   id  Int   fileExtension  String   name  String         self url   url     self id   id     self fileExtension   fileExtension     self name   name        required init from decoder  Decoder  throws       let container   try decoder container keyedBy  CodingKeys self      url   try container decodeIfPresent String self  forKey   url      id   try container decodeIfPresent Int self  forKey   id      fileExtension   try container decodeIfPresent String self  forKey   fileExtension      name   try container decodeIfPresent String self  forKey   name          This is Json String     let jsonString    quot     quot name  quot    quot   quot    quot file extension  quot    quot   quot    quot id  quot  10684   quot url  quot    quot https       homepages cae wisc edu    ece533   images   tulips png  quot        quot name  quot    quot   quot    quot file extension  quot    quot   quot    quot id  quot  10684   quot url  quot    quot https       homepages cae wisc edu    ece533   images   arctichare png  quot        quot name  quot    quot   quot    quot file extension  quot    quot   quot    quot id  quot  10684   quot url  quot    quot https       homepages cae wisc edu    ece533   images   serrano png  quot        quot name  quot    quot   quot    quot file extension  quot    quot   quot    quot id  quot  10684   quot url  quot    quot https       homepages cae wisc edu    ece533   images   peppers png  quot        quot name  quot    quot   quot    quot file extension  quot    quot   quot    quot id  quot  10684   quot url  quot    quot https       homepages cae wisc edu    ece533   images   pool png  quot    quot   Here we convert to swift object     let jsonData   Data jsonString utf8           let decoder   JSONDecoder            do               let fileArray   try decoder decode  ModelPushNotificationFilesFile  self  from  jsonData              print fileArray              print fileArray 0  url            catch               print error localizedDescription

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For iOS 10  amp  Swift 3  using Alamofire  amp  Gloss   Alamofire request  http   localhost 8080 category en   responseJSON   response in  if let data   response data        if let categories    Category  from data  response data             self categories   categories          self categoryCollectionView reloadData         else            print  Casting error             else        print  Data is null           and here is the Category class  import Gloss  struct Category  Decodable        let categoryId  Int      let name  String      let image  String       init  json  JSON            self categoryId    categoryId   lt    json         self name    name   lt    json         self image    image   lt    json           IMO  this is by far the most elegant solution

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SWIFT4 -  Easy and elegant way of decoding JSON strings to Struct   First step - encode String to Data with  utf8 encoding   Than decode your Data to YourDataStruct   struct YourDataStruct  Codable    let type  id  String  init   json  String  using encoding  String Encoding    utf8  throws       guard let data   json data using  encoding  else           throw NSError domain   JSONDecoding   code  0  userInfo  nil            try self init data  data     init data  Data  throws       self   try JSONDecoder   decode YourDataStruct self  from  data                                                                             do   let successResponse   try WSDeleteDialogsResponse response      catch

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Using SwiftyJSON library  you could make it like   if let path   String   Bundle main path forResource   tiles   ofType   json         if let data   NSData contentsOfFile  path            let optData   try  JSON data  data as Data          guard let json   optData else               return                   for     object  in json               let name   object  name   stringValue             print name

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Use swiftyJson swiftyJson platform  ios   8 0  use frameworks   target  MyApp  do pod  SwiftyJSON      gt  4 0  end  Usage import SwiftyJSON  let json   JSON jsonObject   let id   json  quot Id quot   intValue let name   json  quot Name quot   stringValue let lat   json  quot Latitude quot   stringValue let long   json  quot Longitude quot   stringValue let address   json  quot Address quot   stringValue              print id  print name  print lat  print long  print address

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I like RDC s response  but why limit the JSON returned to have only arrays at the top level  I needed to allow a dictionary at the top level  so I modified it thus   extension String       var parseJSONString  AnyObject                let data   self dataUsingEncoding NSUTF8StringEncoding  allowLossyConversion  false           if let jsonData   data                          Will return an object or nil if JSON decoding fails             do                               let message   try NSJSONSerialization JSONObjectWithData jsonData  options  MutableContainers                  if let jsonResult   message as  NSMutableArray                       return jsonResult   Will return the json array output                   else if let jsonResult   message as  NSMutableDictionary                       return jsonResult   Will return the json dictionary output                   else                       return nil                                             catch let error as NSError                               print  An error occurred    error                    return nil                                 else                          Lossless conversion of the string was not possible             return nil

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