I created new login component i add routes for login but when try to run this page i am getting No default engine was specified and no extension was provided.can you please help me out if i want to add new pages what can i do help me

Can you explain why doing npm install doesn't take care for the angular-cli issues and I have to manually mangle with the installation process? Especially on a mean seed repo.

Working fine when redirected from 'http://localhost:4000/books' to 'http://localhost:4000/book-details/5a504218db1db3121100c215' by clicking show-details

But when refresh 'http://localhost:4000/book-details/5a504218db1db3121100c215' page disappear and error shown:

Error: No default engine was specified and no extension was provided.
at new View (/Users/Username/Downloads/mean5/mean-stack-angular5-crud/node_modules/express/lib/view.js:61:11)
at Function.render (/Users/Username/Downloads/mean5/mean-stack-angular5-crud/node_modules/express/lib/application.js:570:12)
at ServerResponse.render (/Users/Username/Downloads/mean5/mean-stack-angular5-crud/node_modules/express/lib/response.js:1008:7)

i tried to console inside book-detail.component.ts

ngOnInit() {
console.log(this.route.snapshot.params['id']);
this.getBookDetail(this.route.snapshot.params['id']);
}

but nothing in shown in console.

Please help.

Initially Angular runs on localhost:4200. The server is configured to run on localhost:3000. However, after you create the book component and run localhost:3000 it shows the Angular page. How does that happen?
I tried to emulate your example with a new project but when I run localhost:3000 I get the REST API end point, not the Angular page.