How can I resolve cannot find module npm-cli.js error? - node.js

Question

My npm has worked well, however today it shows an error saying,
Error: Cannot find module 'C:\Users\mrsim\node_modules\npm\bin\npm-cli.js'
My npm worked well just an hour ago. I typed "npm start" inside of VSCode to start my react-app and it worked very well!
This nightmare started when I created server folder and typed "npm install express".
Normally when I typed "npm install express" in the terminal, it automatically created node-modules folder and package.json for me without any problem, but none of these appear.
To solve this problem I repair node first, and didn't worked.
Next I changed my environment variable, and didn't worked.
Next I used
"SET PATH=C:\Program Files\Nodejs;%PATH%" this sentence in the terminal, and didn't worked.
node:internal/modules/cjs/loader:936
throw err;
^
Error: Cannot find module 'C:\Users\mrsim\node_modules\npm\bin\npm-cli.js'
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
at Function.Module._load (node:internal/modules/cjs/loader:778:27)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
at node:internal/main/run_main_module:17:47 {
code: 'MODULE_NOT_FOUND',
requireStack: []
}
node:internal/modules/cjs/loader:936
throw err;
^
Error: Cannot find module 'C:\Users\mrsim\node_modules\npm\bin\npm-cli.js'
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
at Function.Module._load (node:internal/modules/cjs/loader:778:27)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
at node:internal/main/run_main_module:17:47 {
code: 'MODULE_NOT_FOUND',
requireStack: []
}
This is error message appear on terminal. If i go to that directory, i cannot find npm.cli.js
What should I do...?

Answer 1

Okay, it seems like you installed the npm module in a wrong directory. To fix, this follow the following steps,
Open File Explorer and go in this directory,
C:\Users\mrsim\
You will see a folder named "node_modules". Delete it completely.
Now open up your command prompt
Copy your project directory and paste the following:-
cd <project_dir>
Run,
npm install express
Now it should be installed in the correct directory!

Answer 2

Go to the path that have Appdata\local or Appdata\roaming
Delete the npm and npm cache folder in both
Get back in terminal, Run npm install again, will see a new path ex: npm notice
Run npm install -g npm#8.15.0 to update!
Install the new path and ready to go
This solved my problems.