It is commonly used for transmitting data in web applications (e.g., sending some data from the server to the client, so it can be displayed on a web page, or vice versa). JavaScript Object Notation (JSON) is a standard text-based format for representing structured data based on JavaScript object syntax.
You can use any Json API for this, for example Jackson JSON API. If you need to convert a file containing Json text to a readable format, you need to convert that to an Object and implement toString() method(assuming converting to Java object) to print or write to another file in a much readabe format. How do I convert a JSON file to readable?
How do you convert JSON to Excel using Excel?