How do I get the compact form of pretty-printed JSON code?

Question

How do I make Jackson's build() method pretty-print its JSON output? Here is an example that pretty-prints the ugly form of JSON code. I need to take the nice version of JSON code then convet it to ugly fom. How can it be done? I need to convert this:

 {
   "one" : "AAA",
   "two" : [ "BBB", "CCC" ],
   "three" : {
     "four" : "DDD",
     "five" : [ "EEE", "FFF" ]
   }
 }

to this:

{"one":"AAA","two":["BBB","CCC"],"three":{"four":"DDD","five":["EEE","FFF"]}}

I tried to remove '\n', '\t', and ' ' characters; but there may be some of these characters in values so I can't do that. What else can be done?

Answer 1

Jackson allows you to read from a JSON string, so read the pretty-printed string back into Jackson and then output it again with pretty-print disabled.

See converting a String to JSON

Simple Example

    String prettyJsonString = "{ \"Hello\" : \"world\"}";
    ObjectMapper objectMapper = new ObjectMapper();
    JsonNode jsonNode = objectMapper.readValue(prettyJsonString, JsonNode.class);
    System.out.println(jsonNode.toString());

Requires

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.5.3</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.5.3</version>
</dependency>