Why Am I Getting an 'EPERM: operation not permitted' Error When Using npm on Windows?

"EPERM: operation not permitted" Error on Windows with npm

Issue

While attempting to execute npm commands on Windows OS after setting the prefix path using npm config set prefix /usr/local, users encounter an "EPERM: operation not permitted" error.

Cause

The npm config set prefix /usr/local command is not suitable for Windows systems, as the path /usr/local is not a standard directory in Windows. This command incorrectly set the prefix variable to C:Program Files (x86)Gitlocal, which requires administrator privileges to access and modify.

Solution

1. Run Command Prompt as Administrator: Open an elevated Command Prompt window (Run as administrator).

2. Edit npm Configuration:

   a. Execute the command npm config edit.
   b. Notepad will open the npm configuration file.
   c. Locate the prefix variable and change its value to a suitable location, such as C:UsersAppDataRoamingnpm (adjust the User Name accordingly).

3. Save Changes: Save and close the configuration file.
4. Restart npm: Close and restart Command Prompt without administrator privileges.
5. Verify Operation: Attempt to run npm commands as usual. The "EPERM" error should no longer occur.

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