Debugging & Troubleshooting Interview Questions

Essential tools include: Angular DevTools, Chrome DevTools, Source Maps, Augury (legacy), console methods, debugger statement. VS Code debugging extensions. Browser developer tools for network, performance analysis.

Debug change detection using: enableDebugTools(), profiler, zones visualization. Check for unnecessary triggers, performance impacts. Analyze component update cycles, implement proper change detection strategy.

Debug memory leaks using: Chrome Memory profiler, heap snapshots, timeline recording. Check subscription cleanup, component destruction. Monitor memory usage patterns, implement proper unsubscribe patterns.

Debug routing through Router events logging, Router state inspection. Check guard conditions, route configurations. Analyze navigation lifecycle, implement proper route tracing.

Performance debugging using: Chrome Performance tools, Angular profiler, network tab. Analyze bundle sizes, rendering times, bottlenecks. Monitor CPU usage, implement performance optimizations.

Debug HTTP through Network tab, HttpInterceptors logging. Monitor request/response cycles, analyze headers/payloads. Check error responses, implement proper request tracking.

Production debugging through: error logging services, source maps, monitoring tools. Implement proper error tracking, user feedback collection. Analyze production logs, error patterns.

Debug DI through provider configuration checks, injection tree analysis. Verify service providers, scope issues. Check circular dependencies, implement proper provider debugging.

Template debugging through: browser inspection, Angular DevTools. Check bindings, expressions, structural directives. Analyze template syntax, implement proper debugging statements.

State debugging through: Redux DevTools, state logging, action tracing. Monitor state changes, action effects. Analyze state mutations, implement proper state tracking.

Async debugging through: async/await breakpoints, observable debugging. Monitor promise chains, subscription flows. Analyze async timing issues, implement proper async tracking.

Form debugging through form state inspection, validation checks. Monitor form controls, error states. Analyze validation rules, implement proper form debugging.

Build issues debugging through: build logs, configuration checks. Verify dependencies, version conflicts. Analyze build errors, implement proper build debugging.

Lazy loading debugging through: network monitoring, chunk loading analysis. Check module configurations, route setup. Analyze loading patterns, implement proper chunk tracking.

Component interaction debugging through: input/output tracking, service communication monitoring. Check component hierarchy, event propagation. Analyze component communication patterns.

AOT debugging through: compilation errors analysis, template checking. Verify syntax compatibility, type checking. Analyze compilation process, implement proper AOT debugging.

Security debugging through: CORS analysis, XSS checks, authentication flow verification. Monitor security headers, implement proper security debugging.

SSR debugging through: server logs, hydration checks. Verify platform-specific code, state transfer. Analyze rendering process, implement proper SSR debugging.

Zone.js debugging through: zone hooks monitoring, async operation tracking. Check zone contexts, patched methods. Analyze zone behavior, implement proper zone debugging.

i18n debugging through: translation key checks, locale loading verification. Monitor translation process, cultural formatting. Analyze localization issues, implement proper i18n debugging.

Optimization debugging through: bundle analysis, performance profiling. Check optimization configurations, tree-shaking. Analyze build optimization, implement proper performance debugging.

PWA debugging through: service worker inspection, cache analysis. Verify manifest configuration, offline behavior. Analyze PWA features, implement proper PWA debugging.

Test debugging through: test runner inspection, assertion analysis. Check test setup, mock configurations. Analyze test environment, implement proper test debugging.

Accessibility debugging through: ARIA validation, screen reader testing. Check semantic markup, keyboard navigation. Analyze accessibility requirements, implement proper a11y debugging.

CSS debugging through: style inspection, layout analysis. Check style encapsulation, view encapsulation. Analyze styling issues, implement proper CSS debugging.

WebSocket debugging through: connection state monitoring, message logging. Verify connection lifecycle, error handling. Analyze real-time communication, implement proper WebSocket debugging.

Library debugging through: integration verification, API usage analysis. Check compatibility issues, version conflicts. Analyze library behavior, implement proper integration debugging.

Environment debugging through: configuration file analysis, variable checking. Verify environment setup, build configurations. Analyze environment-specific issues, implement proper config debugging.

Browser compatibility debugging through: cross-browser testing, feature detection. Check polyfills, browser-specific issues. Analyze compatibility requirements, implement proper browser debugging.