How do I pretty-print existing JSON data with Java

Question

I have a compact JSON string  and I want to format it nicely in Java without having to deserialize it first -- e g  just like jsonlint org does it   Are there any libraries out there that provides this   A similar solution for XML would also be nice

User · Accepted Answer

I think for pretty-printing something  it s very helpful to know its structure   To get the structure you have to parse it   Because of this  I don t think it gets much easier than first parsing the JSON string you have and then using the pretty-printing method toString mentioned in the comments above   Of course you can do similar with any JSON library you like

User · Answer

If you are using jackson you can easily achieve this with configuring a SerializationFeature in your ObjectMapper   com fasterxml jackson databind ObjectMapper mapper   new ObjectMapper     mapper configure SerializationFeature INDENT OUTPUT  true    mapper writeValueAsString  lt yourObject gt      Thats it

User · Answer

I fount a very simple solution    lt dependency gt       lt groupId gt com cedarsoftware lt  groupId gt       lt artifactId gt json-io lt  artifactId gt       lt version gt 4 5 0 lt  version gt   lt  dependency gt    Java code   import com cedarsoftware util io JsonWriter        String jsonString    json string plain text   System out println JsonWriter formatJson jsonString

User · Answer

In one line   String niceFormattedJson   JsonWriter formatJson jsonString    or  System out println JsonWriter formatJson jsonString toString        The json-io libray  https   github com jdereg json-io  is a small  75K  library with no other dependencies than the JDK   In addition to pretty-printing JSON  you can serialize Java objects  entire Java object graphs with cycles  to JSON  as well as read them in

User · Answer

Another way to use gson   String json String to print       Gson gson   new GsonBuilder   setPrettyPrinting   create    JsonParser jp   new JsonParser    return gson toJson jp parse json String to print      It can be used when you don t have the bean as in susemi99 s post

User · Answer

Underscore-java library has methods U formatJson json  and U formatXml xml   I am the maintainer of the project

User · Answer

int spacesToIndentEachLevel   2  new JSONObject jsonString  toString spacesToIndentEachLevel     Using org json JSONObject  built in to JavaEE and Android

User · Answer

Use gson  https   www mkyong com java how-to-enable-pretty-print-json-output-gson   Gson gson   new GsonBuilder   setPrettyPrinting   create    String json   gson toJson my bean     output       name    mkyong      age   35     position    Founder      salary   10000     skills          java        python        shell

[java] How do I pretty-print existing JSON data with Java?

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