gson Tutorial

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

Source code of Gson is available on Github.

User guide