Cannot find module 'http-simple-proxy' - although everything is set correctly - node.js

Question

I installed http-simple-proxy globally. I even have it as command in the shell. Then - I created a small JS file with the content from the README (the first section, Installation and basic usage), but when I run it with node {name-of-JS-file} - and it failed with:
$ node {name-of-JS-file}
internal/modules/cjs/loader.js:883
throw err;
^
Error: Cannot find module 'http-simple-proxy'
Require stack:
- {name-of-JS-file}
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)
at Function.Module._load (internal/modules/cjs/loader.js:725:27)
at Module.require (internal/modules/cjs/loader.js:952:19)
at require (internal/modules/cjs/helpers.js:88:18)
at Object.<anonymous> ({name-of-JS-file:3:23)
at Module._compile (internal/modules/cjs/loader.js:1063:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12) {
code: 'MODULE_NOT_FOUND',
requireStack: [ '{name-of-JS-file' ]
}
I have setup the necessary stuff correctly:
$ node -v
v14.16.0
$ npm -v
7.8.0
$ echo $NODE_PATH
/home/petar/.npm-packages
$ ls -la $NODE_PATH
total 24
drwxr-xr-x 6 petar users 4096 Oct 26 15:19 .
drwxr-xr-x 62 petar users 4096 Apr 21 21:22 ..
drwxr-xr-x 2 petar users 4096 Apr 21 20:56 bin
drwxr-xr-x 2 petar users 4096 Oct 19 2020 etc
drwxr-xr-x 3 petar users 4096 Oct 15 2020 lib
drwxr-xr-x 3 petar users 4096 Oct 26 15:19 share
$ which http-simple-proxy
/home/petar/.npm-packages/bin/http-simple-proxy
$ http-simple-proxy
usage: http-simple-proxy [options]
Starts a http-simple-proxy server using the specified command-line options
options:
--version
--config CONFIGFILE Configuration file (YAML or JSON)
--configloader JS-FILE Provide js file as config loader
--configloader-test Test config configloader by printing out its output
--watch Watch config for changes and automatically reload with zero downtime
--silent Silence the log output
--user USER User to drop privileges to once server socket is bound
--group GROUP Group to drop privileges to once server socket is bound
--show-rules Show all rules upon every config load
-h, --help You're staring at it
See https://github.com/gusnips/http-simple-proxy for further info
Any idea what the issue might be?

Answer 1

I installed http-simple-proxy globally.
Globally installed packages are not available for import/require from Node.js programs. You need to install it locally, or at least in the path to your project. Note that the README say to npm install --save http-simple-proxy and does not say to install it globally. Install it globally to get the executable available to your shell, but not to use in a Node.js program itself.