Gson is an Open Source 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.

Goals for Gson

• Provide easy to use mechanisms like toString() and constructor (factory method) to convert Java to JSON and vice-versa

• Allow pre-existing unmodifiable objects to be converted to and from JSON

• Allow custom representations for objects

• Support arbitrarily complex objects

• Generate compact and readable JSON output