$ npm install -g tj/serve

Usage: serve [options] [dir]
Options:
  -h, --help                output usage information
  -V, --version             output the version number
  -o, --open                opens a browser window to this server
  -a, --auth <user>:<pass>  specify basic auth credentials
  -F, --format <fmt>        specify the log format string
  -p, --port <port>         specify the port [3000]
  -r, --root <root>         specify the root directory []
      --https-port <port>   specify the port [3443]
  -H, --hidden              enable hidden file serving
  -S, --no-stylus           disable stylus rendering
  -J, --no-jade             disable jade rendering
      --no-less             disable less css rendering
  -I, --no-icons            disable icons
  -L, --no-logs             disable request logging
  -D, --no-dirs             disable directory serving
  -f, --favicon <path>      serve the given favicon
  -C, --cors                allows cross origin access serving
  -s, --https               also serve over https
      --key                 key file path for https
      --cert                certificate file for https
      --ca                  CA certificate file for https
      --compress            gzip or deflate the response
      --exec <cmd>          execute command on each request

 $ curl https://local:3000/ -H "Accept: text/plain"
 bin
 History.md
 node_modules
 package.json
 Readme.md

$ curl https://local:3000/Readme.md
 # serve
 ...

$ curl https://local:3000/ -H "Accept: application/json"
["bin","History.md","node_modules","package.json","Readme.md"]