JSON order mixed up

Question

I ve a problem trying to make my page printing out the JSONObject in the order i want  In my code  I entered this   JSONObject myObject   new JSONObject    myObject put  userid    User 1    myObject put  amount    24 23    myObject put  success    NO      However  when I see the display on my page  it gives   JSON formatted string     success   NO    userid   User 1    bid  24 23    I need it in the order of userid  amount  then success  Already tried re-ordering in the code  but to no avail  I ve also tried  append    need some help here thanks

User · Answer

u can retain the order  if u use JsonObject that belongs to com google gson  D  JsonObject responseObj   new JsonObject    responseObj addProperty  userid    User 1    responseObj addProperty  amount    24 23    responseObj addProperty  success    NO      Usage of this JsonObject doesn t even bother using Map lt    CHEERS

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Real answer can be found in specification  json is unordered  However as a human reader I ordered my elements in order of importance  Not only is it a more logic way  it happened to be easier to read  Maybe the author of the specification never had to read JSON  I do   So  Here comes a fix          I got really tired of JSON rearranging added properties     Specification states      An object is an unordered set of name value pairs     StackOverflow states     As a consequence  JSON libraries are free to rearrange the order of the elements as they see fit     I state     My implementation will freely arrange added properties  IN SEQUENCE ORDER     Why did I do it  Cause of readability of created JSON document      private static class OrderedJSONObjectFactory       private static Logger log   Logger getLogger OrderedJSONObjectFactory class getName         private static boolean setupDone   false      private static Field JSONObjectMapField   null       private static void setupFieldAccessor             if   setupDone                 setupDone   true              try                   JSONObjectMapField   JSONObject class getDeclaredField  map                    JSONObjectMapField setAccessible true                 catch  NoSuchFieldException ignored                    log warning  JSONObject implementation has changed  returning unmodified instance                                       private static JSONObject create             setupFieldAccessor            JSONObject result   new JSONObject            try               if  JSONObjectMapField    null                    JSONObjectMapField set result  new LinkedHashMap lt  gt                             catch  IllegalAccessException ignored             return result

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I found a  quot neat quot  reflection tweak on  quot the interwebs quot  that I like to share   origin  https   towardsdatascience com create-an-ordered-jsonobject-in-java-fb9629247d76  It is about to change underlying collection in org json JSONObject to an un-ordering one  LinkedHashMap  by reflection API  I tested succesfully  import java lang reflect Field  import java util LinkedHashMap  import org json JSONObject   private static void makeJSONObjLinear JSONObject jsonObject        try               Field changeMap   jsonObject getClass   getDeclaredField  quot map quot                changeMap setAccessible true               changeMap set jsonObject  new LinkedHashMap lt  gt                  changeMap setAccessible false             catch  IllegalAccessException   NoSuchFieldException e                e printStackTrace                       JSONObject requestBody   new JSONObject    makeJSONObjLinear requestBody    requestBody put  quot username quot   login   requestBody put  quot password quot   password            returned      quot username quot    quot billy 778 quot    quot password quot    quot          quot       unordered    instead of    quot password quot    quot          quot    quot username quot    quot billy 778 quot       ordered  by key

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I agree with the other answers  You cannot rely on the ordering of JSON elements   However if we need to have an ordered JSON  one solution might be to prepare a LinkedHashMap object with elements and convert it to JSONObject    Test def void testOrdered         Map obj   new LinkedHashMap       obj put  a    foo1       obj put  b   new Integer 100       obj put  c   new Double 1000 21       obj put  d   new Boolean true       obj put  e    foo2       obj put  f    foo3       obj put  g    foo4       obj put  h    foo5       obj put  x   null       JSONObject json    JSONObject  obj     logger info  Ordered Json    s   json toString         String expectedJsonString        a   foo1   b  100  c  1000 21  d  true  e   foo2   f   foo3   g   foo4   h   foo5          assertEquals expectedJsonString  json toString        JSONAssert assertEquals JSONSerializer toJSON expectedJsonString   json      Normally the order is not preserved as below    Test def void testUnordered         Map obj   new HashMap       obj put  a    foo1       obj put  b   new Integer 100       obj put  c   new Double 1000 21       obj put  d   new Boolean true       obj put  e    foo2       obj put  f    foo3       obj put  g    foo4       obj put  h    foo5       obj put  x   null       JSONObject json    JSONObject  obj     logger info  Unordered Json    s   json toString 3  3        String unexpectedJsonString        a   foo1   b  100  c  1000 21  d  true  e   foo2   f   foo3   g   foo4   h   foo5              string representation of json objects are different     assertFalse unexpectedJsonString equals json toString            json objects are equal     JSONAssert assertEquals JSONSerializer toJSON unexpectedJsonString   json      You may check my post too  http   www flyingtomoon com 2011 04 preserving-order-in-json html

User · Answer

JavaScript objects  and JSON  have no way to set the order for the keys  You might get it right in Java  I don t know how Java objects work  really  but if it s going to a web client or another consumer of the JSON  there is no guarantee as to the order of keys

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As all are telling you  JSON does not maintain  sequence  but array does  maybe this could convince you  Ordered JSONObject

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Not sure if I am late to the party but I found this nice example that overrides the JSONObject constructor and makes sure that the JSON data are output in the same way as they are added  Behind the scenes JSONObject uses the MAP and MAP does not guarantee the order hence we need to override it to make sure we are receiving our JSON as per our order  If you add this to your JSONObject then the resulting JSON would be in the same order as you have created it  import java io IOException  import java lang reflect Field  import java util LinkedHashMap  import org json JSONObject  import lombok extern java Log    Log public class JSONOrder        public static void main String   args  throws IOException            JSONObject jsontest   new JSONObject            try               Field changeMap   jsonEvent getClass   getDeclaredField  quot map quot                changeMap setAccessible true               changeMap set jsonEvent  new LinkedHashMap lt  gt                  changeMap setAccessible false             catch  IllegalAccessException   NoSuchFieldException e                log info e getMessage                       jsontest put  quot one quot    quot I should be first quot            jsonEvent put  quot two quot    quot I should be second quot            jsonEvent put  quot third quot    quot I should be third quot            System out println jsonEvent

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The main intention here is to send an ordered JSON object as response  We don t need javax json JsonObject to achieve that  We could create the ordered json as a string  First create a LinkedHashMap with all key value pairs in required order  Then generate the json in string as shown below   Its much easier with Java 8   public Response getJSONResponse         Map lt String  String gt  linkedHashMap   new LinkedHashMap lt  gt         linkedHashMap put  A    1        linkedHashMap put  B    2        linkedHashMap put  C    3         String jsonStr   linkedHashMap entrySet   stream                map x - gt         x getKey               x getValue                        collect Collectors joining                      return Response ok jsonStr  build        The response return by this function would be following    A   1   B   2   C   3

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Just add the order with this tag  JsonPropertyOrder    quot property1 quot    quot property2 quot

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Download  quot json simple 1 1 jar quot  from this https   code google com p json-simple downloads detail name json simple-1 1 jar amp can 2 amp q  And add the jar file to your lib folder using JSONValue you can convert LinkedHashMap to json string

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For Java code  Create a POJO class for your object instead of a JSONObject  and use JSONEncapsulator for your POJO class  that way order of elements depends on the order of getter setters in your POJO class  for eg  POJO class will be like  Class myObj  String userID  String amount  String success     getter setters in any order that you want   and where you need to send your json object in response  JSONContentEncapsulator lt myObj gt  JSONObject   new JSONEncapsulator lt myObj gt   myObject    JSONObject setObject myObj   return Response status Status OK  entity JSONObject  build      The response of this line will be   myObject      attributes order same as getter setter order

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For those who re using maven  please try com github tsohr json   lt  -- https   mvnrepository com artifact com github tsohr json -- gt   lt dependency gt       lt groupId gt com github tsohr lt  groupId gt       lt artifactId gt json lt  artifactId gt       lt version gt 0 0 1 lt  version gt   lt  dependency gt    It s forked from JSON-java but switch its map implementation with LinkedHashMap which  lemiorhan noted above

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Underscore-java uses linkedhashmap to store key value for json  I am the maintainer of the project   Map lt String  Object gt  myObject   new LinkedHashMap lt  gt     myObject put  userid    User 1    myObject put  amount    24 23    myObject put  success    NO     System out println U toJson myObject

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You cannot and should not rely on the ordering of elements within a JSON object   From the JSON specification at http   www json org      An object is an unordered set of   name value pairs   As a consequence  JSON libraries are free to rearrange the order of the elements as they see fit  This is not a bug

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from lemiorhan example i can solve with just change some line of lemiorhan s code use   JSONObject json   new JSONObject obj     instead of this   JSONObject json    JSONObject  obj   so in my test code is    Map item sub2   new LinkedHashMap    item sub2 put  name    flare    item sub2 put  val1    val1    item sub2 put  val2    val2    item sub2 put  size  102    JSONArray itemarray2   new JSONArray    itemarray2 add item sub2   itemarray2 add item sub2    just for test itemarray2 add item sub2    just for test   Map item sub1   new LinkedHashMap    item sub1 put  name    flare    item sub1 put  val1    val1    item sub1 put  val2    val2    item sub1 put  children  itemarray2    JSONArray itemarray   new JSONArray    itemarray add item sub1   itemarray add item sub1    just for test itemarray add item sub1    just for test  Map item root   new LinkedHashMap    item root put  name    flare    item root put  children  itemarray    JSONObject json   new JSONObject item root    System out println json toJSONString

[java] JSON order mixed up

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