how to retrive JSON data by using swift -

i retrieving datas json using swift. new json. don't how retrieve nested values. previous question issue raised, while retriving datas json using swift . got clarified. new me. json format below. kindly guide me.

json response formats:

{  "salutation": {                 "id": 1,                 "salutation": "mr"                 }, "firstname": "aaa", "middlename": "bbb", "lastname": "c", "employeeid": "rd484",  "station": {                 "id": 86,                 "stationcode": null,                 "stationname": "ddd",                 "subdivision": null,                 "address": null                 }, "subdivsion": {                 "id": 11,                 "divisioncode": "11",                 "divisiondesc": "eee",                 "division": null                 } } 

//my attempt:

 var maindict = nsdictionary() //global declaration   var session = nsurlsession.sharedsession()   //now create nsmutablerequest object using url object  let request = nsmutableurlrequest(url: url!)  request.httpmethod = "post" //set http method post   var err: nserror?  request.httpbody = nsjsonserialization.datawithjsonobject(parameters, options: nil, error: &err) // pass dictionary nsdata object , set request body    request.addvalue("application/json", forhttpheaderfield: "content-type")   request.addvalue("application/json", forhttpheaderfield: "accept")   var task = session.datataskwithrequest(request, completionhandler: {data, response, error -> void in   println("response: \(response)")   self.maindict = nsjsonserialization.jsonobjectwithdata(data, options: nsjsonreadingoptions.mutablecontainers, error: nil) [string: anyobject]   var err: nserror?   var json = nsjsonserialization.jsonobjectwithdata(data, options: .mutableleaves, error: &err) as? nsdictionary    // did jsonobjectwithdata constructor return error? if so, log error console   if(err != nil) {   println(err!.localizeddescription)   let jsonstr = nsstring(data: data, encoding: nsutf8stringencoding)   //println("error not parse json: '\(jsonstr)'")   }   else {   // jsonobjectwithdata constructor didn't return error. but, should still   // check , make sure json has value using optional binding.   if let parsejson = json {    // okay, parsedjson here, let's value 'success' out of   var success = parsejson["success"] as? int   println("succes: \(success)")    self.datafromjson() //method calling    }   else {   // woa, okay json object nil, went worng. maybe server isn't running?   let jsonstr = nsstring(data: data, encoding: nsutf8stringencoding)   println("error not parse json: \(jsonstr)")   //println("authentication failed")    }   }  })    task.resume()   func datafromjson()     {      println("main dict values: \(maindict)") //printing values      let dataarray = maindict["firstname"] as? [string:anyobject]         println("firstname values: \(dataarray)") // printing nil values     } 

your data structure not begin array time, dictionary. structure is:

root dictionary -> "salutation" -> dictionary
root dictionary -> "station" -> dictionary
root dictionary -> "subdivsion" -> dictionary

let's want access "id" of "salutation", then:

// exemple of how download, surely have own way func getjson(url: nsurl) {     let session = nsurlsession.sharedsession()     let request = nsurlrequest(url: url)     let task = session.datataskwithrequest(request){         (data, response, downloaderror) -> void in         if let error = downloaderror {             println(error.localizeddescription)         } else {             var jsonerror: nserror?              // cast result dictionary             if let dict = nsjsonserialization.jsonobjectwithdata(data, options: nil, error: &jsonerror) as? [string: anyobject] {                  // print dictionary check contents                 println(dict)                  if let salutationdictionary = dict["salutation"] as? [string: anyobject] {                      if let id = salutationdictionary["id"] as? int {                          println(id)                      }                  }              }             if jsonerror != nil {                 println(jsonerror)             }         }     }     task.resume() } 

edit:

my friend, code mess... suggest cleaning when you've got errors, helps debug. anyway, here's corrected version of new code. pay attention how maindict declared on first line. also, had 1 unnecessary call nsjsonserialization, simplified it. note: sake of example, i've included datafromjson function code directly inside if let parsejson ..., of course doesn't mean have same.

var maindict: [string: anyobject]?  var session = nsurlsession.sharedsession() //let parameters = ...  let request = nsmutableurlrequest(url: your_url!) request.httpmethod = "post"  var err: nserror? request.httpbody = nsjsonserialization.datawithjsonobject(parameters, options: nil, error: &err) request.addvalue("application/json", forhttpheaderfield: "content-type") request.addvalue("application/json", forhttpheaderfield: "accept")  var task = session.datataskwithrequest(request, completionhandler: {data, response, error -> void in      println("response: \(response)")      var err: nserror?     maindict = nsjsonserialization.jsonobjectwithdata(data, options: nil, error: &err) as? [string: anyobject]      if err != nil {          println(err!.localizeddescription)      } else {          if let parsejson = maindict {              var success = parsejson["success"] as? int             println("succes: \(success)")              println("main dict values: \(maindict)")             let firstname = maindict!["firstname"] as? string             println("firstname: \(firstname)")          }         else {              let jsonstr = nsstring(data: data, encoding: nsutf8stringencoding)             println("error not parse json: \(jsonstr)")          }     } })  task.resume() 

please pay attention details , study modifications comparing attempt. answer has been tested on own server , works, can use working base.