This pure Lua library reimplements part of the ngx_lua module's Nginx API for Lua with LuaJIT FFI and installs the new FFI-based Lua API into the ngx.* and ndk.* namespaces used by the ngx_lua module. In addition, this Lua library implements any significant new Lua APIs of the ngx_lua module as proper Lua modules, like ngx.semaphore and ngx.balancer. The FFI-based Lua API can work with LuaJIT's JIT compiler. ngx_lua's default API is based on the standard Lua C API, which will never be JIT compiled and the user Lua code is always interpreted (slowly).