How to Fix the 'EPERM: operation not permitted' Error When Setting npm Prefix on Windows?

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

When attempting to modify the npm configuration on Windows by running npm config set prefix /usr/local, users may encounter an "EPERM: operation not permitted" error.

This issue occurs due to the specified path (/usr/local) being invalid on Windows systems. The prefix configuration parameter should not be set to non-Windows paths.

To resolve the error, it is necessary to reset the prefix variable to an appropriate value:

1. Run Command Prompt as Administrator: To access the required directories, run a Command Prompt window with elevated privileges (as administrator).
2. Edit npm Configuration: Type npm config edit to open the npm configuration in a text editor (such as Notepad).
3. Modify Prefix Value: Locate the prefix variable and change its value to a valid Windows path, such as C:UsersAppDataRoamingnpm. Save the changes.
4. Reset Prefix: Run npm config set prefix C:UsersAppDataRoamingnpm again to reset the prefix value.

By following these steps, the "EPERM: operation not permitted" error should be resolved, and npm commands can be executed normally.

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