Convert JSON String to Pretty Print JSON output using Jackson

Question

This is the JSON string I have     attributes     nm   ACCOUNT   lv     v    Id  null  State  null   vt   java util Map   cn  1    vt   java util Map   status   SUCCESS   lmd  13585    nm   PROFILE   lv     v    Party  null  Ads  null   vt   java util Map   cn  2    vt   java util Map   status   SUCCESS   lmd  41962      I need to convert the above JSON String into Pretty Print JSON Output  using Jackson   like below          attributes                            nm    ACCOUNT                lv                                            v                              Id   null                           State   null                                             vt    java util Map                        cn   1                                               vt    java util Map                status    SUCCESS                lmd   13585                                   nm    PROFILE              lv                                            v                              Party   null                           Ads   null                                             vt    java util Map                        cn   2                                               vt    java util Map                status    SUCCESS                lmd   41962                     Can anyone provide me an example based on my example above  How to achieve this scenario  I know there are lot of examples  but I am not able to understand those properly  Any help will be appreciated with a simple example   Updated   Below is the code I am using   ObjectMapper mapper   new ObjectMapper    System out println mapper defaultPrettyPrintingWriter   writeValueAsString jsonString      But this doesn t works with the way I needed the output as mentioned above   Here s is the POJO I am using for the above JSON   public class UrlInfo implements Serializable        private List lt Attributes gt  attribute      class Attributes        private String nm      private List lt ValueList gt  lv      private String vt      private String status      private String lmd       class ValueList       private String vt      private String cn      private List lt String gt  v      Can anyone tell me whether I got the right POJO for the JSON or not   Updated   String result   restTemplate getForObject url toString    String class    ObjectMapper mapper   new ObjectMapper    Object json   mapper readValue result  Object class    String indented   mapper defaultPrettyPrintingWriter   writeValueAsString json    System out println indented    This print statement show correct way I need  model addAttribute  response    indented      Below line prints out something like this   System out println indented          attributes             nm     ACCOUNT        error     null SYS00019CancellationException in CoreImpl fetchAttributes n java util concurrent CancellationException n tat java util concurrent FutureTask Sync innerGet FutureTask java 231  n tat java util concurrent FutureTask         status     ERROR            which is the way I needed to be shown  But when I add it to model like this   model addAttribute  response    indented      And then shows it out in a resultform jsp page like below        lt fieldset gt           lt legend gt Response  lt  legend gt               lt strong gt   response  lt  strong gt  lt br   gt        lt  fieldset gt    I get something like this      attributes         nm     ACCOUNT    error     null     SYS00019CancellationException in CoreImpl fetchAttributes n  java util concurrent CancellationException n tat  java util concurrent FutureTask Sync innerGet FutureTask java 231  n tat  java util concurrent FutureTask     status     ERROR          which I don t need  I needed the way it got printed out above  Can anyone tell me why it happened this way

User · Answer

You can achieve this using bellow ways  1  Using Jackson from Apache     String formattedData new ObjectMapper   writerWithDefaultPrettyPrinter    writeValueAsString YOUR JSON OBJECT    Import bellow class  import com fasterxml jackson databind ObjectMapper   It s gradle dependency is   compile  com fasterxml jackson core jackson-core 2 7 3  compile  com fasterxml jackson core jackson-annotations 2 7 3  compile  com fasterxml jackson core jackson-databind 2 7 3   2  Using Gson from Google String formattedData new GsonBuilder   setPrettyPrinting        create   toJson YOUR OBJECT    Import bellow class  import com google gson Gson   It s gradle is  compile  com google code gson gson 2 8 2   Here  you can also download correct updated version from repository

User · Answer

To indent any old JSON  just bind it as Object  like   Object json   mapper readValue input  Object class     and then write it out with indentation   String indented   mapper writerWithDefaultPrettyPrinter   writeValueAsString json     this avoids your having to define actual POJO to map data to   Or you can use JsonNode  JSON Tree  as well

User · Answer

The new way using Jackson 1 9  is the following   Object json   OBJECT MAPPER readValue diffResponseJson  Object class   String indented   OBJECT MAPPER writerWithDefaultPrettyPrinter                                   writeValueAsString json     The output will be correctly formatted

User · Answer

This looks like it might be the answer to your question   It says it s using Spring  but I think that should still help you in your case   Let me inline the code here so it s more convenient   import java io FileReader   import org codehaus jackson map ObjectMapper  import org codehaus jackson map ObjectWriter   public class Foo     public static void main String   args  throws Exception         ObjectMapper mapper   new ObjectMapper        MyClass myObject   mapper readValue new FileReader  input json    MyClass class          this is Jackson 1 x API only       ObjectWriter writer   mapper defaultPrettyPrintingWriter              IMPORTANT       for Jackson 2 x use the line below instead of the one above          ObjectWriter writer   mapper writer   withDefaultPrettyPrinter        System out println writer writeValueAsString myObject           class MyClass     String one    String   two    MyOtherClass three     public String getOne    return one     void setOne String one   this one   one     public String   getTwo    return two     void setTwo String   two   this two   two     public MyOtherClass getThree    return three     void setThree MyOtherClass three   this three   three      class MyOtherClass     String four    String   five     public String getFour    return four     void setFour String four   this four   four     public String   getFive    return five     void setFive String   five   this five   five

User · Answer

ObjectMapper readTree   can do this in one line  mapper readTree json  toPrettyString     Since readTree produces a JsonNode  this should pretty much always produce equivalent pretty-formatted JSON  as it JsonNode is a direct tree representation of the underlying JSON string  Prior to Jackson 2 10 The JsonNode toPrettyString   method was added  in Jackson 2 10   Prior to that  a second call to the ObjectMapper was needed to write the pretty formatted result  mapper writerWithDefaultPrettyPrinter            writeValueAsString mapper readTree json

User · Answer

The simplest and also the most compact solution  for v2 3 3   ObjectMapper mapper   new ObjectMapper    mapper enable SerializationFeature INDENT OUTPUT   mapper writeValueAsString obj

User · Answer

Since jackson-databind 2 10 JsonNode has the toPrettyString   method to easily format JSON  objectMapper    readTree  quot    quot      toPrettyString      From the docs   public String toPrettyString   Alternative to toString   that will serialize this node using Jackson default pretty-printer  Since  2 10

User · Answer

For Jackson 1 9  We can use the following code for pretty print   ObjectMapper objectMapper   new ObjectMapper    objectMapper enable SerializationConfig Feature INDENT OUTPUT

User · Answer

If you format the string and return object like RestApiResponse lt String gt   you ll get unwanted characters like escaping etc   n    quot   Solution is to convert your JSON-string into Jackson JsonNode object and return RestApiResponse lt JsonNode gt   ObjectMapper mapper   new ObjectMapper    JsonNode tree   objectMapper readTree jsonString   RestApiResponse lt JsonNode gt  response   new RestApiResponse lt  gt     apiResponse setData tree   return response

User · Answer

I think  this is the simplest technique to beautify the json data   String indented    new JSONObject Response   toString 4     where Response is a String   Simply pass the 4 indentSpaces  in toString   method   Note  It works fine in the android without any library  But in java you have to use the org json library

[java] Convert JSON String to Pretty Print JSON output using Jackson

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