npm - EPERM: operation not permitted on Windows

I ran

npm config set prefix /usr/local

After running that command, When trying to run any npm commands on Windows OS I keep getting the below.

Error: EPERM: operation not permitted, mkdir 'C:\Program Files (x86)\Git\local'
at Error (native)

Have deleted all files from

C:\Users\<your username>\.config\configstore\

It did not work.

Any suggestion ?

Running this command was my mistake.

npm config set prefix /usr/local

Path /usr/local is not for windows. This command changed the prefix variable at 'C:\Program Files (x86)\Git\local'

To access and make a change to this directory I need to run my cmd as administrator.

So I did:

1. Run cmd as administrator
2. Run npm config edit (You will get notepad editor)
3. Change prefix variable to C:\Users\<User Name>\AppData\Roaming\npm

Then npm start works in a normal console.

This is occurring because windows is not giving permission to the user to create a folder inside system drive. To solve this:

Right Click

The Folder > Properties > Security Tab

Click on Edit to change Permissions > Select the user and give Full Control to that user.

Sometimes, all that's required is to stop the dev server before installing/updating packages.

I solved the problem by changing windows user access for the project folder:

Here is a screenshot: http://prntscr.com/djdn0g