Kudu npm install failed

I'm getting a very strange error when trying to deploy my project with kudu on Azure.

I have build my project with dotnet with VueJs. I have used the following template "https://github.com/MarkPieszak/aspnetcore-Vue-starter"

I have tried setting the WEBSITE_NODE_DEFAULT_VERSION to a few different version now without any luck.

Here are the out from Kudu:

Command: "D:\home\site\deployments\tools\deploy.cmd"
Handling ASP.NET Core Web Application deployment.
  Restore completed in 735.88 ms for D:\home\site\repository\projectx.csproj.
Microsoft (R) Build Engine version 15.9.20+g88f5fadfbe for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restore completed in 345.52 ms for D:\home\site\repository\projectx.csproj.
  projectx -> D:\home\site\repository\bin\Release\netcoreapp2.1\projectx.dll
  projectx -> D:\home\site\repository\bin\Release\netcoreapp2.1\projectx.Views.dll
  NPM Installing dependencies...
  npm WARN package.json assert@1.4.1 assert is also the name of a node core module.
  npm WARN package.json buffer@4.9.1 buffer is also the name of a node core module.
  npm WARN package.json events@1.1.1 events is also the name of a node core module.
  npm WARN package.json indexof@0.0.1 No repository field.
  npm WARN package.json punycode@2.1.1 punycode is also the name of a node core module.
  npm WARN package.json querystring@0.2.0 querystring is also the name of a node core module.
  npm WARN package.json string_decoder@1.1.1 string_decoder is also the name of a node core module.
  npm WARN package.json url@0.11.0 url is also the name of a node core module.
  npm WARN package.json util@0.10.4 util is also the name of a node core module.
  npm WARN package.json vue-template-es2015-compiler@1.6.0 No repository field.
EXEC : npm ERR! error : Method Not Allowed [D:\home\site\repository\projectx.csproj]
  npm ERR!     at errorResponse (D:\Program Files (x86)\npm\1.4.28\node_modules\npm\lib\cache\add-named.js:260:10)
  npm ERR!     at D:\Program Files (x86)\npm\1.4.28\node_modules\npm\lib\cache\add-named.js:203:12
  npm ERR!     at saved (D:\Program Files (x86)\npm\1.4.28\node_modules\npm\node_modules\npm-registry-client\lib\get.js:167:7)
  npm ERR!     at Object.oncomplete (fs.js:108:15)
  npm ERR! If you need help, you may report this *entire* log,
  npm ERR! including the npm and node versions, at:
  npm ERR!     <http://github.com/npm/npm/issues>

  npm ERR! System Windows_NT 6.2.9200
  npm ERR! command "node" "D:\\Program Files (x86)\\npm\\1.4.28\\node_modules\\npm\\bin\\npm-cli.js" "install" "--ignore-scripts"
  npm ERR! cwd D:\home\site\repository
  npm ERR! node -v v0.10.40
  npm ERR! npm -v 1.4.28
  npm ERR! code E405
D:\home\site\repository\projectx.csproj(25,5): error MSB3073: The command "npm install --ignore-scripts" exited with code 1.
Failed exitCode=1, command=dotnet publish "D:\home\site\repository\projectx.csproj" --output "D:\local\Temp\8d65c86f4c7808a" --configuration Release
An error has occurred during web site deployment.
\r\nD:\Program Files (x86)\SiteExtensions\Kudu\79.11121.3655\bin\Scripts\starter.cmd "D:\home\site\deployments\tools\deploy.cmd"

Anybody who has a idea? The project runs fine on my computer.

According to your error information, your issue was caused by the incorrect Node version obviously. The one of the prerequisites of GitHub repo you used is NodeJS >= 8.9.4, but now it's v0.10.40 on your Azure WebApp. As you said, the WEBSITE_NODE_DEFAULT_VERSION setting has beed added, but it seems not work.

I followed the document to add the same setting and click Save on Azure portal as the figure below, then immediately my kudu console restarted and check my node & npm version which be correct.

So my suggestion is:

Please check your WEBSITE_NODE_DEFAULT_VERSION setting whether be added in the correct field.
You can try to restart your Azure WebApp manually to make the change works.