ASP.NET Core 2.2 with React InvalidOperationException: Failed to start 'npm'

Question

I've made a website in ASP.NET COre 2.2 with React+Redux.

Locally in VS2019 works fine, but when I've moved to IIS10, where there is another ASP.NET Core WebAPI application that is correctly run, I get the error:

InvalidOperationException: Failed to start 'npm'

NodeJs is installed, and saved in C:\\Program Files\\NodeJs. If I run npm -v I correctly get the version.

The application pool of the website is currently running with the identity Local System

The Environment Variable is correctly set the right path, and even the error message can see it:

[1] Ensure that 'npm' is installed and can be found in one of the PATH directories. Current PATH enviroment variable is: C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Program Files\\dotnet\\;C:\\Program Files (x86)\\dotnet\\; C:\\Program Files\\nodejs\\; C:\\Windows\\system32\\config\\systemprofile\\AppData\\Local\\Microsoft\\WindowsApps Make sure the executable is in one of those directories, or update your PATH.

The stack is:

System.AggregateException: Se han producido uno o varios errores. ---> System.AggregateException: Se han producido uno o varios errores. ---> System.InvalidOperationException: Failed to start 'npm'. To resolve this:.

[1] Ensure that 'npm' is installed and can be found in one of the PATH directories.
    Current PATH enviroment variable is: C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\dotnet\;C:\Program Files (x86)\dotnet\;C:\Program Files\nodejs\;C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\WindowsApps
    Make sure the executable is in one of those directories, or update your PATH.

[2] See the InnerException for further details of the cause. ---> System.ComponentModel.Win32Exception: El nombre del directorio no es válido
   en System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo)
   en System.Diagnostics.Process.Start(ProcessStartInfo startInfo)
   en Microsoft.AspNetCore.NodeServices.Npm.NpmScriptRunner.LaunchNodeProcess(ProcessStartInfo startInfo)
   --- Fin del seguimiento de la pila de la excepción interna ---
   en Microsoft.AspNetCore.NodeServices.Npm.NpmScriptRunner.LaunchNodeProcess(ProcessStartInfo startInfo)
   en Microsoft.AspNetCore.NodeServices.Npm.NpmScriptRunner..ctor(String workingDirectory, String scriptName, String arguments, IDictionary`2 envVars)
   en Microsoft.AspNetCore.SpaServices.ReactDevelopmentServer.ReactDevelopmentServerMiddleware.<StartCreateReactAppServerAsync>d__3.MoveNext()
   --- Fin del seguimiento de la pila de la excepción interna ---
   en System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   en System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   en Microsoft.AspNetCore.SpaServices.ReactDevelopmentServer.ReactDevelopmentServerMiddleware.<>c.<Attach>b__2_0(Task`1 task)
   en System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
   en System.Threading.Tasks.Task.Execute()
   --- Fin del seguimiento de la pila de la excepción interna ---
   en System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   en Microsoft.AspNetCore.SpaServices.Extensions.Util.TaskTimeoutExtensions.<WithTimeout>d__1`1.MoveNext()
--- Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción ---
   en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   en Microsoft.AspNetCore.SpaServices.Extensions.Proxy.SpaProxy.<PerformProxyRequest>d__4.MoveNext()
--- Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción ---
   en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   en Microsoft.AspNetCore.Builder.SpaProxyingExtensions.<>c__DisplayClass2_0.<<UseProxyToSpaDevelopmentServer>b__0>d.MoveNext()
--- Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción ---
   en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   en Microsoft.AspNetCore.Builder.RouterMiddleware.<Invoke>d__4.MoveNext()
--- Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción ---
   en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   en Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.<Invoke>d__7.MoveNext()
--- Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción ---
   en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   en System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   en Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.<Invoke>d__7.MoveNext()
---> (Nº de excepción interna 0) System.AggregateException: Se han producido uno o varios errores. ---> System.InvalidOperationException: Failed to start 'npm'.

How can I fix it? I don't know what else to do...

Answer 1

This error related to npm cant located so you need to check your enviroment variable like this. Make sure when you go into nodejs folder you will npm file like this

So check in system variable

and in user variable