Npm err! code e401

Error: npm ERR! code E401

This error is caused by a problem with authentication or authorization when trying to access a package from the npm registry.

The HTTP response status code 401 indicates that the request requires user authentication or the authenticated user does not have permission to access the requested resource.

To fix this error, you can try the following steps:

1. Check your npm login: Make sure you are logged in to npm with the correct credentials. Run the command npm login and enter your username and password.
2. Verify your access: Ensure that you have the necessary permissions to access the package you are trying to install. This may involve checking with the package owner or the registry administrators.
3. Use npm’s cache: Sometimes the cache can cause issues with package installation. Try clearing the cache by running npm cache clean --force and then try installing the package again.
4. Specify registry: If you are using a private registry, make sure to specify it in your package.json file or using the --registry flag when running npm commands.

Here’s an example of how to specify a registry in package.json:

    
"publishConfig": {
  "registry": "https://npm.example.com/"
}