AppRoutingModule file.

app-routing.module.ts

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { Routes, RouterModule } from '@angular/router';
import { AddUpdateRecipeComponent } from './components/add-update-recipe/add-update-recipe.component';
import { RecipeListComponent } from './components/recipe-list/recipe-list.component';

const routes: Routes = [
  { path: 'recipe-list', component: RecipeListComponent },
  { path: '', redirectTo: 'recipe-list', pathMatch: 'full' },
  { path: 'add-update-recipe/:id', component: AddUpdateRecipeComponent }
]

@NgModule({
  declarations: [],
  imports: [
    CommonModule,
    RouterModule.forRoot(routes)
  ],
  exports: [RouterModule]
})
export class AppRoutingModule { }