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Use Angular signals for synchronous values and derived state, services or a feature-scoped store to own state shared across components, and NgRx Store when application-wide coordination needs explicit actions, reducers, and selectors. Keep each piece of state with the narrowest owner that can serve its consumers; use RxJS for stream-shaped asynchronous work rather than treating signals as a replacement for streams.
Start by deciding who owns the state
State management is primarily a question of ownership and lifetime, not a contest to find one tool for every value. A component can own a value used only by its own interface. When multiple components need the same state or operations, put ownership behind a service or feature-scoped store. Reserve root-level state for information that genuinely needs to be shared across the application.
A useful boundary is for components to express user intent and render state, while the service or store owns writable state and the operations that change it. Consumers can receive read-only signals or selectors instead of being allowed to modify the source of truth directly. This is an architectural pattern, not a rule Angular mandates.
Match provider scope to the state’s lifetime
- Component scope: Keep ephemeral presentation state, such as whether one component’s panel is expanded, in that component.
- Feature or route scope: Use a service or SignalStore provided at the component or route boundary when state is shared within that feature and should follow its lifecycle.
- Application scope: Provide state at the root only when it must remain shared across unrelated parts of the application.
Angular services are reusable units commonly used for data fetching and business logic. NgRx SignalStore also supports component, route, and root provider scopes. See the Angular services guide and NgRx SignalStore guide.
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Use signals for current values and derived state
A signal wraps a value and notifies interested consumers when that value changes. A writable signal is a source of truth: update it with set or update. A computed signal derives a value from other signals and is read-only. For example, a feature can store a selected quantity in a writable signal and derive a subtotal with computed, rather than keeping a second writable subtotal that must be synchronized.
Angular tracks signal reads in reactive contexts, including templates. When a template reads a signal, Angular registers that component as a dependency and can mark it for update when the signal changes. Signals represent the current value; they are not general-purpose event streams. See the Angular Signals guide and Signals essentials.
Update objects and arrays deliberately
Angular signals use referential equality through Object.is() by default. When state contains an object or array, prefer an immutable replacement or update pattern so the signal receives a new reference when the value changes. Mutating an existing object in place can leave its reference unchanged and therefore fail to represent a new signal value as expected.
Keep effects at the imperative boundary
Do not use an effect to copy one signal into another merely to keep derived state in sync. Use computed() for derived values or linkedSignal() when a writable value needs to be linked to another reactive value. Angular describes effects as a last resort for reactive logic and recommends them for synchronizing signals with imperative, non-signal systems, such as storage, logging, custom DOM behavior, or third-party renderers. The Angular effects guide explains the distinction.
Signal dependency tracking is synchronous: reads made after an asynchronous boundary are not tracked as dependencies of the earlier reactive context. For asynchronous signal-based data, consider Angular’s resource APIs where appropriate, and account for server-side rendering and serialized TransferState, particularly for user-specific data. See the Angular resources guide.
Keep RxJS for stream-shaped asynchronous work
Signals and RxJS can coexist. Use RxJS when the work benefits from stream operators and time-based orchestration—for example, debouncing a search query, cancelling a previous request when a newer query arrives, or combining asynchronous sources. If a component or other consumer benefits from signal semantics, bridge the stream at that boundary with Angular’s @angular/core/rxjs-interop APIs.
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toSignal subscribes to its Observable immediately, so creating one can start the Observable’s side effects. Treat that subscription as part of the design, not as a passive conversion. Angular also provides toObservable for the opposite direction. The Angular RxJS interop guide documents both.
NgRx SignalStore’s rxMethod illustrates how stream operators such as debounceTime, distinctUntilChanged, and switchMap can handle query-driven loading while the store presents signal-based state. Signals do not make RxJS obsolete, and RxJS does not require every UI consumer to work directly with Observables.
Choose between a feature store and global NgRx Store
A service or feature-scoped SignalStore is often enough when state and its operations belong to one feature boundary. NgRx Store is an explicit global-state architecture built around actions, reducers, and selectors; NgRx describes it as mainly for application-wide state and recommends local state for local concerns. NgRx’s SHARI framework provides a practical check for whether shared state deserves that coordination:
- Shared: Is the state used across multiple parts of the application?
- Hydrated: Does it need to be restored or hydrated?
- Available: Must it still be available after navigating away and returning to a route?
- Retrieved: Does obtaining it involve side effects?
NgRx also identifies many interactions, multiple data sources, or service-managed state that has become difficult to coordinate as reasons Store may help. These are decision signals, not a rule that a particular application size requires NgRx. See the NgRx Store guide and NgRx Store rationale.
Compare the real trade-offs
| Approach | Best fit | Consider another approach when |
|---|---|---|
| Component signals | State is local to one component, especially transient presentation state and synchronous derivations. | Several unrelated consumers need the same source of truth or operations. |
| Service or feature SignalStore | State and behavior are shared within a feature or route boundary, with a lifecycle that can be scoped there. | Coordination has expanded across the application, or explicit global action and reducer structure is valuable. |
| NgRx Store | State is broadly shared and needs explicit coordination, including concerns such as hydration, route re-entry, or side-effectful retrieval. | The state is local and a global architecture would add maintenance overhead without solving a real coordination need. |
RxJS is not a separate ownership scope in this comparison: it is often the right tool for asynchronous stream behavior inside a component, service, or store. Choose based on consumer distribution, lifecycle, asynchronous complexity, persistence or hydration needs, desire for traceable actions, and the team’s familiarity with the architecture. No universal performance threshold follows from these criteria.
NgRx SignalStore offers a signal-native structured option: its guide shows state, computed values, and methods composed together, protects state from external modification by default, and supports component, route, or root provision. Its RxJS integration is available for more complex asynchronous methods. That can be a useful middle ground when a feature needs a deliberate store boundary without adopting global NgRx Store.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose route loading by navigation behavior
Use a route resolver when essential data should be fetched before route activation; Angular’s resolver guide notes that resolvers can access route-level services. For applications using Signals, Angular also points to route resources as an option for reactive loading. Choose according to whether navigation should wait for essential data and how the feature represents loading, rather than treating resolvers and resources as universal competitors. See the Angular route resolver guide.
Check version-sensitive defaults before applying them
Angular’s roadmap material says zoneless change detection became stable and the default in 2026, and OnPush became the default change-detection strategy. These are release-sensitive defaults: check the roadmap and the documentation for the Angular version your project actually uses before relying on them. The Angular roadmap is the relevant status source.
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