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NPM–401 error when restoring packages from an Azure DevOps Artifacts NPM registry

I had to make some changes to an Angular application, so I cloned the app and ran ‘npm install’. This failed with the following error message:

npm WARN tar ENOENT: no such file or directory, open 'D:\Projects\CMS\Bridges.CMS.SPA\node_modules\.staging\dayjs-f8637d82\plugin\weekOfYear.d.ts'

npm WARN tar ENOENT: no such file or directory, open 'D:\Projects\CMS\Bridges.CMS.SPA\node_modules\.staging\dayjs-f8637d82\plugin\weekYear.d.ts'

npm ERR! code E401

npm ERR! Unable to authenticate, need: Bearer authorization_uri=https://login.windows.net/<guid>, Basic realm="https://pkgsprodsu3weu.app.pkgs.visualstudio.com/", TFS-Federated   

Some packages should be downloaded from our own NPM registry hosted in Azure DevOps Artifacts. As I couldn’t authenticate succesfully this resulted in a 401 error.

To solve this I first had to install the vsts-npm-auth package:

PS D:\Projects\cms\ui\CMS\Bridges.CMS.SPA> npm install -g vsts-npm-auth

C:\Users\bart\AppData\Roaming\npm\vsts-npm-auth -> C:\Users\bart\AppData\Roaming\npm\node_modules\vsts-npm-auth\bin\vsts-npm-auth.exe

+ vsts-npm-auth@0.41.0

added 1 package from 1 contributor in 1.947s

Then I could login and create the required .npmrc file by executing the following command:

PS D:\Projects\cms\ui\CMS\Bridges.CMS.SPA> vsts-npm-auth -config .npmrc

vsts-npm-auth v0.41.0.0

-----------------------

Creating npmrc file. Path: C:\Users\bart\.npmrc

Getting new credentials for source:https://pkgs.dev.azure.com/<my-organization>/<my-project>/_packaging/bridges/npm/registry/, scope:vso.packaging_write vso.drop_write

More information: https://docs.microsoft.com/en-us/azure/devops/artifacts/npm/npmrc?view=azure-devops

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