ASP.NET Core 3 and React

Understanding the frontend entry point

We have a good clue as to where the entry point is from our examination of the Startup class in the ASP.NET Core backend. In the Configure method, the SPA middleware is set up with the source path as ClientApp:

app.UseSpa(spa =>{  spa.Options.SourcePath = "ClientApp";  if (env.IsDevelopment())  {    spa.UseReactDevelopmentServer(npmScript: "start");  }});

If we look in the ClientApp folder, we'll see a file called package.json. This is a file that is often used in React apps and contains information about the project, its npm dependencies, and the scripts that can be run to perform tasks.

npm is a popular package manager for JavaScript. The dependencies in package.json reference packages in the npm registry. ...