Hello!
After failing to find any good, and easy to use nginx config formatter,
I decided to roll out my own
https://nginxbeautifier.com

you can also install it locally on your box using the instructions found on my github page
https://github.com/vasilevich/nginxbeautifier

hope you find it useful!
if you have any issuses please open an issuse/pull request on my github page
thanks!