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+# Data fetching with resources
+
+The Angular Router integrates with Angular signals through the `resources` route configuration. This allows you to fetch data reactively using `Resource` APIs.
+
+## Why use route resources?
+
+Route resources offer several advantages over traditional [data resolvers](/guide/routing/data-resolvers):
+
+- **Parallel execution**: Route resources across all matched routes load concurrently instead of one route at a time.
+- **Non-blocking data loading**: Use `nonBlocking()` to activate the route immediately and render loading skeletons or UI states while data loads in the background.
+- **Reload without renavigation**: Call `.reload()` on individual resources or update signal parameters to refresh data without rerunning guards or rematching routes.
+- **Reactive data fetching**: Resources integrate directly with Angular signals, automatically re-evaluating when signal dependencies change and exposing reactive status signals like `isLoading()` and `error()`.
+
+## Enabling route resources
+
+To enable route resources, provide `withRouterResources()` to your router configuration:
+
+```ts
+import {provideRouter, withComponentInputBinding, withRouterResources} from '@angular/router';
+
+bootstrapApplication(App, {
+  providers: [provideRouter(routes, withComponentInputBinding(), withRouterResources())],
+});
+```
+
+TIP: Enable `withComponentInputBinding()` so the router can bind resolved resources directly to component inputs.
+
+## Defining route resources
+
+You define resources on a route with the `resources` function. The function runs in an injection context, so you can use `inject()` to access services, API clients, or stores directly inside the route definition.
+
+```angular-ts
+import {Component, inject, input, resource} from '@angular/core';
+import {Routes} from '@angular/router';
+import {UserService} from './user.service';
+
+const routes: Routes = [
+  {
+    path: 'user/:id',
+    component: UserProfile,
+    resources: (ctx) => {
+      const userService = inject(UserService);
+      return {
+        user: resource({
+          params: () => ctx.params()['id'],
+          loader: ({params: id}) => userService.getUser(id),
+        }),
+      };
+    },
+  },
+];
+
+@Component({
+  template: `<p>User: {{ user().name }}</p>`,
+})
+export class UserProfile {
+  // The router binds only the value for blocking resources.
+  user = input.required<User>();
+}
+```
+
+### The `ResourceContext` object
+
+The `resources` function receives a `ResourceContext` that provides access to reactive route signals: `params`, `queryParams`, `fragment`, and `data`.
+
+### Supported resource implementations
+
+The `resources` function can return any Angular `Resource` implementation, such as `resource()`, `rxResource()`, or a custom resource.
+
+```ts
+import {Routes} from '@angular/router';
+import {rxResource} from '@angular/core/rxjs-interop';
+
+const routes: Routes = [
+  {
+    path: 'user/:id',
+    component: UserProfile,
+    resources: (ctx) => ({
+      user: rxResource({
+        params: () => ctx.params()['id'],
+        stream: ({params: id}) => fetchUserObservable(id),
+      }),
+    }),
+  },
+];
+```
+
+NOTE: `rxResource` uses the `stream` property instead of `loader` to accept a function that returns an Observable.
+
+The `resources` function can also be `async` and return a `Promise` if you need to perform asynchronous setup or dynamic imports before configuring resources:
+
+```ts
+resources: async (ctx) => {
+  const {fetchUserData} = await import('./user-api');
+  return {
+    user: resource({
+      params: () => ctx.params()['id'],
+      loader: ({params: id}) => fetchUserData(id),
+    }),
+  };
+},
+```
+
+## Fine-grained change tracking with signals
+
+A resource tracks the signals that its `params` function reads. Read the exact value you need so that the resource refetches only when that value changes:
+
+```ts
+resources: (ctx) => ({
+  products: resource({
+    // Tracks only the 'category' query parameter
+    params: () => ctx.queryParams()['category'],
+    loader: ({params: category}) => fetchProducts(category),
+  }),
+}),
+```
+
+A navigation that changes an unrelated query parameter, such as `?sort=desc` or `?page=2`, leaves `category` unchanged, so the resource does not refetch.
+
+TIP: Read specific properties, such as `ctx.params()['id']`, instead of returning an entire parameters object, such as `ctx.params()`. The router creates a new object on every navigation, so returning the whole object refetches the resource even when the individual values are unchanged.
+
+## Parallel execution
+
+Data resolvers execute sequentially from parent route to child route. If a parent route resolver takes 200ms and a child route resolver takes 300ms, the navigation is blocked for 500ms.
+
+Route resources across the matched route hierarchy run concurrently, so the same navigation completes in 300ms, the time of the slowest resource.
+
+## Blocking and non-blocking resources
+
+By default, every resource returned from `resources` is blocking: the router waits until the data is fully loaded before it activates the route and the component.
+
+For a blocking resource, the router binds the resolved value to the component input, so the input type is `T` instead of `Resource<T>`. The component never observes a `loading` state because the router blocks navigation until the resource loads, and it never observes an `error` state because the router cancels the navigation when the resource errors.
+
+To handle loading states in the UI instead, wrap the resource in `nonBlocking()`. The router activates the component immediately and binds the full `Resource<T>` object to the component input, which gives you access to `isLoading()`, `error()`, and the other resource signals.
+
+```angular-ts
+import {Component, input, Resource, resource} from '@angular/core';
+import {Routes, nonBlocking} from '@angular/router';
+
+const routes: Routes = [
+  {
+    path: 'reports',
+    component: Reports,
+    resources: () => ({
+      reportData: nonBlocking(
+        resource({
+          loader: () => fetchHeavyReportData(),
+        }),
+      ),
+    }),
+  },
+];
+
+@Component({
+  template: `
+    @if (reportData().isLoading()) {
+      <p>Loading...</p>
+    } @else if (reportData().error()) {
+      <p>Error loading report.</p>
+    } @else if (reportData().hasValue()) {
+      <report-view [data]="reportData().value()" />
+    }
+  `,
+})
+export class Reports {
+  reportData = input.required<Resource<ReportData>>();
+}
+```
+
+NOTE: If a blocking resource errors, the router cancels the navigation and emits a `NavigationError` event. A resource wrapped in `nonBlocking()` completes the navigation and exposes the failure through its `error()` signal.
+
+### Redirecting from a resource
+
+If a blocking resource needs to redirect the user (for example, if an item is not found), throw a `RedirectCommand` inside the resource loader. The router cancels the current navigation and redirects to the specified URL:
+
+```ts
+import {inject, resource} from '@angular/core';
+import {RedirectCommand, Router, Routes} from '@angular/router';
+
+const routes: Routes = [
+  {
+    path: 'user/:id',
+    component: UserProfile,
+    resources: (ctx) => {
+      const router = inject(Router);
+
+      return {
+        user: resource({
+          params: () => ctx.params()['id'],
+          loader: async ({params: id}) => {
+            const user = await fetchUser(id);
+            if (!user) {
+              throw new RedirectCommand(router.parseUrl('/not-found'));
+            }
+            return user;
+          },
+        }),
+      };
+    },
+  },
+];
+```
+
+## Reloading resources without renavigation
+
+With data resolvers, refetching data requires a route navigation (for example, navigating with `onSameUrlNavigation: 'reload'`), which rematches routes and reruns guards and resolvers.
+
+Route resources support two ways to refresh data in place:
+
+1. **Programmatic reload**: Call `.reload()` on the `Resource` instance.
+2. **Reactive reload**: Update a signal that the resource's `params` function reads, such as an application filter or state signal, which reruns the loader.
+
+Because the router binds only the value of a blocking resource to a component input, read the `Resource` instance from `ActivatedRoute` or `ActivatedRouteSnapshot` when you need to call `.reload()` or inspect status signals:
+
+```angular-ts
+import {Component, inject, input} from '@angular/core';
+import {ActivatedRoute} from '@angular/router';
+
+@Component({
+  template: `
+    <p>User: {{ user().name }}</p>
+    <button (click)="refreshUser()">Refresh</button>
+  `,
+})
+export class UserProfile {
+  user = input.required<User>();
+  private userResource = inject(ActivatedRoute).resources?.['user'];
+
+  refreshUser() {
+    // Reloads only this specific resource without renavigating the route
+    this.userResource?.reload();
+  }
+}
+```
+
+## Transitional states during pending navigations
+
+While a navigation is pending, the router freezes the resources that it exposes on `ActivatedRoute`, which masks intermediate `loading` and `reloading` states.
+
+If you navigate from `/user/1` to `/user/2` and the router reuses the `UserProfile` component, the component keeps rendering the data from `/user/1` until `/user/2` resolves. The router then unfreezes the resources and the UI transitions directly to the new data with no loading flash.
+
+The router exposes these resources as read-only, even when the `resources` function returns a writable resource such as `resource()`. You can read the resource signals and call `reload()`, but not `set()` or `update()`. A `reload()` call during an active navigation or during rollback recovery returns `false` so that it cannot interrupt the router's transition tracking.
+
+### Rollback recovery on cancellation
+
+If a navigation is cancelled (for example, by a guard), the router reverts the state tree to the previous state. This reversion can cause the resource's signal dependencies, such as route parameters, to revert to their previous values.
+
+Because the parameters changed back, the resource might automatically trigger a new load to fetch data for the old parameters. To prevent flashing a loading state for data that was already visible, the router retains the previous resource snapshot in the UI until the resource has settled in the reverted state.
+
+TIP: Forward the `abortSignal` provided by the resource loader to your asynchronous calls (like `fetch`). When the router rolls back parameters or supersedes navigations, the pending request is cleanly aborted: `loader: ({params: id, abortSignal}) => fetchUser(id, {signal: abortSignal})`.