The Pretty print JSON in Java tutorial shows you how to use Jackson pretty print for JSON Object and String in the console.
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Pretty Print JSON Object
Example to convert Object and jackson pretty print its output in JSON format.
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Student student = new Student(); //set student data student.setName("David"); student.setAge("35"); student.setCourses(new String[]{"Math","Foreign Language","Animal Biology"}); //print json format ObjectMapper mapper = new ObjectMapper(); System.out.println(mapper.writeValueAsString(student)); |
And the json output is in compact mode.
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{"name":"David","age":35,"courses":["Math","Foreign Language","Animal Biology"]} |
To enable jackson pretty print, use writerWithDefaultPrettyPrinter.
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ObjectMapper mapper = new ObjectMapper(); System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(student)); |
And here is pretty output
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{ "name": "David", "age": 35, "courses": [ "Math", "Foreign Language", "Animal Biology" ] } |
Pretty Print JSON String
Now we can try to use writerWithDefaultPrettyPrinter again .
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String jsonString = "{"name":"David","age":35,"courses":["Math","Foreign Language","Animal Biology"]}"; System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(jsonString)); |
Here is output:
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"{"name":"David","age":35,"courses":["Math","Foreign Language","Animal Biology"]}" |
And not what we want, json string is still in compact mode. We solve it by using a bit tricky that bind the JSON string to Object class before pretty print it.
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String jsonString = "{"name":"David","age":35,"courses":["Math","Foreign Language","Animal Biology"]}"; Object jsonObject = mapper.readValue(jsonString, Object.class); System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(jsonObject)); |
And here is pretty output
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{ "name": "David", "age": 35, "courses": [ "Math", "ForeignLanguage", "AnimalBiology" ] } |
That’s it. This Pretty print JSON in Java tutorial is quite simple by using Jackson framework. You can get JSON pretty print with good tool online Pretty Print JSON
