How to convert Java Object to or from JSON using Jackson 2?

by Britni Oscar, updated on May 16, 2020 How to convert Java Object to or from JSON using Jackson 2?

Another Java tutorial on how to convert Java Object to or from JSON using Jackson 2 with an example

Programming is an art that cannot be learned without a cent percent concentration. If you do not have the ability to focus for hours and solve technically complex problems, it is not something you should attempt. JAVA is one of the programming languages that have been holding a dominant role for a long time. It is used in several niches including web development, server-side programming, and standalone applications.  JSON is a modern-day language and is commonly used for data transfer between a web-based application and the corresponding server.

If you want to convert a Java Object to JSON or vice versa using Jackson 2, here are the steps that have to be performed:

  1. To begin with, create the .JAR files of Jackson and add them to the required XML file.
  2. The second step is related to the creation of Plain Old Java Object (POJO). This has to be converted to JAVA Class for JSON.
  3. Initiate a JAVA Class and convert the class used in the Organization to JSON. For this activity, the object mapper class used in the Jackson API will come into play.
  4. Once all the three steps mentioned above have been completed, the process can be executed.


The use of JSON beautifier by Prepostseo helps in reducing compilation time

JSON is a complex programming platform to deal with. A developer related to this field needs to apply the highest concentration level to come up with robust applications. However, at times, even if the application has been developed properly, its performance particularly the compilation time is too much.

  • The time that a build requires executing depends on the file size. When you have a lot of whitespaces, unwanted functions, and other haphazardly written, the compilation time increases automatically. The best way to deal with it is by using a reliable code beautification tool like JSON beautifier by Prepostseo.com

Here is the process that you need to follow while using it:

1.    Upload / Paste source code

You can choose from the two code uploading options available. First of all, if you have a JSON file, browse for it and upload it. You can also copy the code from the source location and paste it in the given text box. The third option is writing the code from start in the text box and then beautifying it.

2.    Use beautified code

Once the code has been beautified, you can copy it and use it wherever required. This is a free tool so no charges would be applied.

3.    Examples

To see how his tool works, let us go through two examples:

Consider the following piece of code with extra spaces:

?var myJSON = '{"name":"David", "age":34, "city":"New York"}'; 

var myObj = JSON.parse(myJSON);

document.getElementById("demo").innerHTML = myObj.name;

The beautified version would look as follows:

var myJSON = '{"name":"David", "age":34, "city":"New York"}';
var myObj = JSON.parse(myJSON);
document.getElementById("demo").innerHTML = myObj.name;

Another example is shown below:

string json = @"{
   'CPU': 'Intel',
   'PSU': '500W',


   'Drives': [
     'DVD read/writer'
     /*(broken)*/,
     '500 gigabyte hard drive',
             
'200 gigabyte hard drive'
   ]
}"

The beautified form is shown below:

string json = @"{
   'CPU': 'Intel',
   'PSU': '500W',
   'Drives': [
     'DVD read/writer'
     /*(broken)*/,
     '500 gigabyte hard drive',
     '200 gigabyte hard drive'
   ]
}"


Cleanly formatted JSON code is a business requirement

There is no doubt that programming has some ethics and developers have to follow them. It is a fact that the biggest priority for any JSON programmer is making the code run. However, usually, when this task gets completed, the code is in a distorted form.  Usually, a final code copy has to be delivered to the client for record maintaining purposes. This is where you can use the JSON beautifier by Prepostseo so that the code can be converted to a presentable form.

  • Is using a JSON beautifier the best way out? It is not the only option but definitely the easiest one. The other option is that the developer should work on each line, remove white spaces, and then optimize the code. To start with, when you are dealing with thousands of lines of code, this is an impossible option. Even if a developer aims at completing this task, it would require hours while the beautifier would complete the same task in minutes.


Avoid unwanted code errors through a JSON beautifier

Removal of white spaces and code sorting manually is a very risky alternative. At times, programmers unintentionally delete key parts due to which the program stops running. If you have a deadline, this would be a huge problem to deal with. Instead of taking this risk, you can use any of the free-dependable tools like the JSON beautifier by Prepostseo. 

  • These tools are tailor-made for beautifying code and that too without creating any technical problems. JSON developers have to use all their concentration on developing the application and running it successfully. Beautifying the code is an added tension on their heads. Hence, using this dedicated application to improve code appearance is a much better alternative.


JSON beautifiers are simple to use

A person does not have to be necessarily a programmer for using this tool. It has a very simple process and users are only responsible for code uploading. They do not have to go through the JSON code or develop any kind of understanding. Thus, if you are related to business development or product management, you can easily complete this task and deliver the code copy to the client.

  • The time that the application would take to beautify the code is a varying factor.  Substandard tools can consume a long span and even go into a not responding mode. Therefore, a careful approach should be selected before making a selection.

Summing it up

Why is code beautifying such an important step which has to be completed? The run time of an application depends on the file size it has. Heavy sized soft wares take a long span to execute properly. If you are programming using JSON, a good JSON beautifier is needed. This is a smart tool that would run through the code and organize its appearance with perfection. For instance, if there are unnecessary spaces between subsequent lines, they would be removed. There is nothing tough about using them and no advanced programming knowledge is needed. However, these tools are immensely productive because they reduce the workload a programmer has to tolerate. Prior to submission, he does not have to work on the appearance in any way. Once the functional requirements have been completed and the application is running successfully, a good JSON beautifier can be used for automated code beautification.

That just the basic. If you need more deep learning about Java and Spring Framework you can take the following cheap course:

Thanks!

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