Nuax is a micro-framework based on OpenResty to write simple JSON web services.

Example:

# nginx.conf
http {
server {
    listen 80;

    location / {
    content_by_lua '
        local app = require "nuax"

        app:get("/hello/:name", function(request, response)
            response.json = {Hello=request.urlmatch.name}
        end)

        app.main()
    '
    }
  }

Of course you can separate the Lua code into its own module and use content_by_lua_file.

To build your app, all you have to do is define HTTP methods (like app:get()) and routes (like "/hello/:name") combos.

When app.main() is called through Nginx's root location it will try to find a corresponding match. If any is found, a Request object is built using Nginx's request environment and a Response object is prepared.

From there, all you have to do is fill response.json with whatever JSON data you want to send back to the user.

Your Lua functions can access everything OpenResty has to offer of course and use whatever libraries you want.