How to block access to a specific directory?

Question

Nginx

There are web applications in php. Inside it there is a directory with js files. But they are implemented through nodeJs.
How to completely close access to this directory and the files in it.
After all, there are a lot of things in those files, for example, a connection to the database, and in general, there is no hunting somehow, so that everyone would know the architecture of my application.

Answer 1

https://httpd.apache.org/docs/2.4/mod/mod_authz_co...

<Directory /path/to/dir>
Require all denied
</Directory>

Closes access to the directory.

Answer 2

If Apache can still create .htaccess with contents deny from all
Nginx in config:
location /path {
deny all;
}