formatter
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About The JSON Formatter was created to help with debugging. As data expressed as JSON is often written without line breaks to save space, it became extremely difficult to actually read and make sense of it. This tool hopes to solve the problem by formatting and validating JSON data so that it is easy to read and debug by human beings. This third major iteration of the JSON Formatter & Validator has been immensely improved by users suggestions.
JSON Formatter (& Validator!)
Gson is a Java library that can be used to convert Java Objects into their JSON representation. It can also be used to convert a JSON string to an equivalent Java object. Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of. There are a few open-source projects that can convert Java objects to JSON. However, most of them require that you place Java annotations in your classes; something that you can not do if you do not have access to the source-code. Most also do not fully support the use of Java Generics.
gson - Google Code
Welcome to SOJO -
The intention for this project is a Java framework, that convert JavaBeans in a simplified representation. So it is easy and uniform to handle and control the access to JavaBeans properties. The goal of the SOJO project is to provide a library to convert object graphs into a specific structure (manages cycle detection, as well).