CODEWITHSUNDEEP
asp.net-coreasp.net-core-mvcasp.net-core-webapicreate-react-app
Norman W
Norman W

Reputation: 21

ASP.NET Core with React error - The npm script 'start' exited

I am creating a new asp.net core project in VS 2019. It's a web app in core v5 with React. I have NodeJS v14 installed. When I run the project once I create it, I get this error:

The npm script 'start' exited without indicating that the create-react-app server was listening for requests

I haven't changed any line of code and this is the result of the scaffolding.

Upvotes: 0

Views: 1309

Answers (1)

Gonzalo Carmenado
Gonzalo Carmenado

Reputation: 114

Your problem is probably your "ASPNETCORE_ENVIRONMENT" variable in Development enviroment. If you look your Startup.cs file, you will find this lines:

if (env.IsDevelopment())
{
   spa.UseReactDevelopmentServer(npmScript: "start");
}

When you upload that code to a server with the developmen variable, the angular CLI cannot be launched a second time, so it crashes and gives that error message. You can substitute it for:

 #if DEBUG
    spa.UseReactDevelopmentServer(npmScript: "start");
 #endif

I recommend this second option, since if you use the first one, the application will stop working locally.

Upvotes: 1

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