Testing, Performance & Deployment
Angular Best Practices
Most Angular review feedback comes down to the same habits: keep components thin, put logic in services, prefer the async pipe over manual subscriptions, use OnPush with immutable data, and lazy-load features.
What is Best Practices in Angular?
Most Angular review feedback comes down to the same habits: keep components thin, put logic in services, prefer the async pipe over manual subscriptions, use OnPush with immutable data, and lazy-load features.
Key points to remember
- Components render; services hold logic and state.
- Use the async pipe instead of subscribing in the component class.
- Turn on OnPush and treat inputs as immutable.
- Never call methods or getters from template bindings.
- Give every list a trackBy or track expression.
- Lazy-load feature routes and defer heavy widgets.
- Type every API response with an interface; avoid any.
- Keep secrets out of environment files — the bundle is public.
- Prefer standalone components, signals and the new control flow in new code.
- Handle loading, empty and error states for every asynchronous view.
Common mistakes with Best Practices
- A component holding HTTP calls, business rules and view logic together.
- Manual subscriptions without unsubscribing.
- OnPush combined with mutated objects, which silently stops updates.
Angular Best Practices— Interview Questions & FAQs
How should I structure a large Angular application?+
Group by feature, with each feature owning its components, services and routes, and lazy-load each feature route. Keep genuinely shared UI in a shared folder and app-wide singletons in core.