Authentication & Security Interview Questions
Comprehensive authentication & security interview questions and answers for Apollo GraphQL. Prepare for your next job interview with expert guidance.
Questions Overview
1. How do you implement authentication in Apollo Client?
Basic2. What are the best practices for token management?
Moderate3. How do you handle authorization in queries and mutations?
Advanced4. What is the role of Apollo Link in security?
Moderate5. How do you implement secure file uploads?
Advanced6. What are security considerations for cache?
Advanced7. How do you handle OAuth integration?
Advanced8. What are CORS considerations in Apollo Client?
Moderate9. How do you implement role-based access control?
Advanced10. What are security best practices for mutations?
Moderate11. How do you handle session management?
Moderate12. What are security implications of persisted queries?
Advanced13. How do you implement secure websocket connections?
Advanced14. What are security considerations for error handling?
Moderate15. How do you implement rate limiting?
Advanced16. What are security best practices for local state?
Moderate17. How do you handle secure data persistence?
Advanced18. What are security considerations for fragments?
Advanced19. How do you implement secure file downloads?
Moderate20. What are security implications of client directives?
Advanced1. How do you implement authentication in Apollo Client?
BasicAuthentication through HTTP headers, context setup. Use Apollo Link for token management. Features: JWT handling, session management. Implement token refresh, secure storage.
2. What are the best practices for token management?
ModerateToken management through secure storage, automatic refresh. Implement token rotation, expiration handling. Features: JWT validation, secure transmission. Consider security implications.
3. How do you handle authorization in queries and mutations?
AdvancedAuthorization through directives, field-level checks. Implement role-based access, permission validation. Features: context-based auth, error handling. Ensure proper access control.
4. What is the role of Apollo Link in security?
ModerateApollo Link manages request/response pipeline. Add authentication headers, handle errors. Features: token injection, request modification. Essential for security implementation.
5. How do you implement secure file uploads?
AdvancedSecure uploads through proper validation, token verification. Implement file type checks, size limits. Features: multipart requests, progress tracking. Consider security measures.
6. What are security considerations for cache?
AdvancedCache security through proper data handling, sensitive info protection. Implement cache policies, access control. Features: data encryption, secure storage. Prevent data leaks.
7. How do you handle OAuth integration?
AdvancedOAuth integration through proper flow implementation, token management. Handle authorization code, access tokens. Features: refresh flow, state management. Ensure secure authentication.
8. What are CORS considerations in Apollo Client?
ModerateCORS handling through proper server configuration, client setup. Implement request headers, preflight handling. Features: origin validation, credential handling. Ensure secure cross-origin requests.
9. How do you implement role-based access control?
AdvancedRBAC through directives, context checks. Implement permission system, role validation. Features: hierarchical roles, permission inheritance. Ensure proper authorization.
10. What are security best practices for mutations?
ModerateMutation security through proper validation, authorization checks. Implement input sanitization, access control. Features: data validation, error handling. Prevent unauthorized modifications.
11. How do you handle session management?
ModerateSession management through proper storage, expiration handling. Implement session tokens, refresh mechanism. Features: session validation, secure storage. Ensure secure user sessions.
12. What are security implications of persisted queries?
AdvancedPersisted queries security through proper whitelisting, validation. Implement query registry, access control. Features: query verification, cache security. Prevent query injection.
13. How do you implement secure websocket connections?
AdvancedSecure websockets through proper authentication, token validation. Implement connection params, protocol security. Features: connection lifecycle, error handling. Ensure secure real-time communication.
14. What are security considerations for error handling?
ModerateError security through proper message handling, stack trace protection. Implement error masking, logging strategy. Features: error sanitization, security logging. Prevent sensitive information exposure.
15. How do you implement rate limiting?
AdvancedRate limiting through proper configuration, request tracking. Implement throttling logic, error responses. Features: limit enforcement, user identification. Prevent abuse and DOS attacks.
16. What are security best practices for local state?
ModerateLocal state security through proper encryption, access control. Implement secure storage, data handling. Features: sensitive data protection, secure operations. Prevent client-side vulnerabilities.
17. How do you handle secure data persistence?
AdvancedSecure persistence through proper encryption, storage strategy. Implement secure cache, local storage. Features: data protection, access control. Ensure secure client-side storage.
18. What are security considerations for fragments?
AdvancedFragment security through proper access control, type checking. Implement fragment masking, permission validation. Features: field-level security, type restrictions. Prevent unauthorized data access.
19. How do you implement secure file downloads?
ModerateSecure downloads through proper authentication, access validation. Implement token verification, stream handling. Features: file access control, secure transfer. Ensure secure file delivery.
20. What are security implications of client directives?
AdvancedDirective security through proper validation, execution control. Implement directive restrictions, permission checks. Features: directive scope, security boundaries. Prevent directive misuse.