Why node js not installed?

Question

I have a code like this:
```py
result = subprocess.run(
    ['node', './app/services/tiktok/urlebird/hash.js', video_url],
        capture_output=True, text=True
)
```
And also such a config, in the form of a **railway.json** file:
```json
{
    "$schema": "https://schema.up.railway.app/railway.schema.json",
    "build": {
        "builder": "NIXPACKS",
        "nixpacksPlan": {
            "providers": ["python"],
            "phases": {
                "setup": {
                    "nixPkgs": ["...", "nodejs"]
                }
            }
        }
    }
}
```
But every time it comes to executing **javascript** code - I get this error:
```
Traceback (most recent call last):

File "/opt/venv/lib/python3.11/site-packages/apscheduler/executors/base_py3.py", line 30, in run_coroutine_job

retval = await job.func(*job.args, **job.kwargs)

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "/app/app/services/tiktok/starter.py", line 22, in start

medias = await UrleBird().get_user_medias(user)

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "/app/app/services/tiktok/urlebird/crawler.py", line 67, in get_user_medias

result = subprocess.run(

^^^^^^^^^^^^^^^

File "/root/.nix-profile/lib/python3.11/subprocess.py", line 548, in run

with Popen(*popenargs, **kwargs) as process:

^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "/root/.nix-profile/lib/python3.11/subprocess.py", line 1026, in __init__

self._execute_child(args, executable, preexec_fn, close_fds,

File "/root/.nix-profile/lib/python3.11/subprocess.py", line 1955, in _execute_child

raise child_exception_type(errno_num, err_msg, err_filename)

FileNotFoundError: [Errno 2] No such file or directory: 'node'
```
I tried installing node through the site by selecting it under **Providers** in the settings, now tried through the config file and failed again. Please tell me what the problem is.