Lua CJSON is a Lua C module that provides fast JSON parsing and encoding support for Lua.
Project homepage: http://www.kyne.com.au/~mark/software/lua-cjson.php
OpenResty includes its own fork of this library, however. The repository of OpenResty's fork is on GitHub:
This library is enabled by default. You can specify the
--without-lua_cjson option to OpenResty's
./configure script to explicitly disable it.