Generate JSON string from NSDictionary in iOS

Question

I have a dictionary I need to generate a JSON string by using dictionary  Is it possible to convert it  Can you guys please help on this

User · Answer

NOTE  This answer was given before iOS 5 was released   Get the json-framework and do this    import  SBJsonWriter h        SBJsonWriter  jsonWriter     SBJsonWriter alloc  init    NSString  jsonString    jsonWriter stringWithObject myDictionary       jsonWriter release     myDictionary will be your dictionary

User · Answer

In Swift  I ve created the following helper function   class func nsobjectToJSON swiftObject  NSObject        var jsonCreationError  NSError      let jsonData  NSData   NSJSONSerialization dataWithJSONObject swiftObject  options  NSJSONWritingOptions PrettyPrinted  error   amp jsonCreationError        if jsonCreationError    nil           println  Errors    jsonCreationError              else              everything is fine and we have our json stored as an NSData object  We can convert into NSString         let strJSON   NSString    NSString data  jsonData  encoding  NSUTF8StringEncoding           println    strJSON

User · Answer

Here are categories for NSArray and NSDictionary to make this super-easy  I ve added an option for pretty-print  newlines and tabs to make easier to read     interface NSDictionary  BVJSONString  - NSString   bv jsonStringWithPrettyPrint  BOOL  prettyPrint   end       implementation NSDictionary  BVJSONString     - NSString   bv jsonStringWithPrettyPrint  BOOL  prettyPrint        NSError  error       NSData  jsonData    NSJSONSerialization dataWithJSONObject self                                                    options  NSJSONWritingOptions      prettyPrint   NSJSONWritingPrettyPrinted   0                                                       error  amp error         if    jsonData            NSLog    s  error         func    error localizedDescription           return               else           return   NSString alloc  initWithData jsonData encoding NSUTF8StringEncoding               end       interface NSArray  BVJSONString  -  NSString   bv jsonStringWithPrettyPrint  BOOL prettyPrint   end       implementation NSArray  BVJSONString  - NSString   bv jsonStringWithPrettyPrint  BOOL  prettyPrint       NSError  error      NSData  jsonData    NSJSONSerialization dataWithJSONObject self                                                        options  NSJSONWritingOptions   prettyPrint   NSJSONWritingPrettyPrinted   0                                                           error  amp error        if    jsonData            NSLog    s  error         func    error localizedDescription           return              else           return   NSString alloc  initWithData jsonData encoding NSUTF8StringEncoding            end

User · Answer

As of ISO7 at least you can easily do this with NSJSONSerialization

User · Answer

You can also do this on-the-fly by entering the following into the debugger  po   NSString alloc  initWithData  NSJSONSerialization dataWithJSONObject yourDictionary options 1 error nil  encoding 4

User · Answer

In Swift  version 2 0    class func jsonStringWithJSONObject jsonObject  AnyObject  throws - gt  String        let data  NSData    try  NSJSONSerialization dataWithJSONObject jsonObject  options  NSJSONWritingOptions PrettyPrinted       var jsonStr  String      if data    nil           jsonStr   String data  data   encoding  NSUTF8StringEncoding             return jsonStr

User · Answer

Now  no need third party classes ios 5 introduced Nsjsonserialization   NSString  urlString   Your url   NSString  urlUTF8    urlString stringByAddingPercentEscapesUsingEncoding NSUTF8StringEncoding   NSURL  url   NSURL alloc initWithString urlUTF8   NSURLRequest  request  NSURLRequest requestWithURL url    NSURLResponse  response   NSData  GETReply    NSURLConnection sendSynchronousRequest request returningResponse  amp response error nil    NSError  myError   nil   NSDictionary  res    NSJSONSerialization JSONObjectWithData GETReply options NSJSONReadingMutableLeaves   NSJSONReadingMutableContainers error  amp myError    Nslog       res     this code can useful for getting jsondata

User · Answer

Here is the Swift 4 version  extension NSDictionary   func toString   throws - gt  String        do           let data   try JSONSerialization data withJSONObject  self  options   prettyPrinted          return String data  data  encoding   utf8            catch  let error           throw error              Usage Example  do      let jsonString   try dic toString             catch  let error           print error localizedDescription          Or if you are sure it is valid dictionary then you can use  let jsonString   try  dic toString

User · Answer

Apple added a JSON parser and serializer in iOS 5 0 and Mac OS X 10 7  See NSJSONSerialization   To generate a JSON string from a NSDictionary or NSArray  you do not need to import any third party framework anymore   Here is how to do it   NSError  error   NSData  jsonData    NSJSONSerialization dataWithJSONObject dictionaryOrArrayToOutput                                                     options NSJSONWritingPrettyPrinted    Pass 0 if you don t care about the readability of the generated string                                                      error  amp error    if    jsonData        NSLog   Got an error       error     else       NSString  jsonString     NSString alloc  initWithData jsonData encoding NSUTF8StringEncoding

User · Answer

To convert a NSDictionary to a NSString   NSError   err  NSData   jsonData    NSJSONSerialization dataWithJSONObject myDictionary options 0 error  amp err    NSString   myString     NSString alloc  initWithData jsonData encoding NSUTF8StringEncoding

User · Answer

This will work in swift4 and swift5   let dataDict    the dictionary you want to convert in jsonString    let jsonData   try  JSONSerialization data withJSONObject  dataDict  options  JSONSerialization WritingOptions prettyPrinted   let jsonString   NSString data  jsonData  encoding  String Encoding utf8 rawValue   as String  print jsonString

User · Answer

public func jsonPrint   o  NSObject  spacing  String       after  String       before  String             let newSpacing   spacing              if o isArray             print before                if let a   o as  Array lt NSObject gt                for object in a                   jsonPrint object  spacing  newSpacing  after  object    a last              before  newSpacing                                  print spacing         after        else           if o isDictionary                 print before                    if let a   o as  Dictionary lt NSObject  NSObject gt                    for  key  val  in a                       jsonPrint val  spacing  newSpacing  after       before  newSpacing   key description                                                      print spacing         after            else               print before   o description   after                      This one is pretty close to original Objective-C print style

User · Answer

NSMutableDictionary  contentDictionary     NSMutableDictionary alloc init            contentDictionary setValue   a  forKey   b             contentDictionary setValue   c  forKey   d            NSData  data    NSJSONSerialization dataWithJSONObject contentDictionary options NSJSONWritingPrettyPrinted error nil           NSString  jsonStr     NSString alloc  initWithData data                                                   encoding NSUTF8StringEncoding

User · Answer

You can pass array or dictionary  Here  I am taking NSMutableDictionary   NSMutableDictionary  contentDictionary     NSMutableDictionary alloc init    contentDictionary setValue   a  forKey   b     contentDictionary setValue   c  forKey   d      To generate a JSON string from a NSDictionary or NSArray  You don t need to import any third party framework  Just use following code -  NSError  error   NSData  jsonData    NSJSONSerialization dataWithJSONObject contentDictionary    Here you can pass array or dictionary                     options NSJSONWritingPrettyPrinted    Pass 0 if you don t care about the readability of the generated string                     error  amp error   NSString  jsonString  if  jsonData        jsonString     NSString alloc  initWithData jsonData encoding NSUTF8StringEncoding         This is your JSON String       NSUTF8StringEncoding encodes special characters using an escaping scheme   else       NSLog   Got an error       error       jsonString          NSLog   Your JSON String is      jsonString

[ios] Generate JSON string from NSDictionary in iOS

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