GraphQL Assignment-4

Basic Questions

  1. Create a resolver getUser(id) that throws an error if user not found.
  2. Add try…catch around a resolver fetching products and return a safe error message.
  3. Write mutation createPost that throws error if title field is empty.
  4. Add error code “INVALID_INPUT” when a mutation registerUser gets invalid email.
  5. Log all GraphQL errors to console using a custom format.
  6. Configure Morgan to log every GraphQL request path.
  7. Use Winston to log failed mutations in a log file.
  8. Build a login mutation that signs JWT after checking hardcoded credentials.
  9. Protect getProfile query using middleware that validates JWT from headers.
  10. Write a resolver deleteComment(id) that is only accessible if the user is logged in.
  11. Add middleware that rejects a request if JWT is missing.
  12. Restrict getAllUsers query so only ADMIN can access it.
  13. Add role-based check in updateUser mutation (user can update only their own data).
  14. Return error “UNAUTHORIZED” when a non-admin tries to delete another user.
  15. Setup a subscription messageAdded for new chat messages.
  16. Trigger subscription when mutation sendMessage is executed.
  17. Test two clients: one sending message, other subscribed to receive updates.
  18. Add subscription orderStatusUpdated(orderId) for order tracking.
  19. Build subscription userJoinedChat(roomId) to notify when a user joins.
  20. Test subscription by simulating multiple users joining the same chat room.

 Intermediate  Questions

  1. Implement centralized error formatter returning {code, message, path}.
  2. Add validation error for age < 18 in mutation createAccount.
  3. Simulate DB connection error in a resolver and handle gracefully.
  4. Write custom class ValidationError and use it in a resolver.
  5. Configure Winston to log only errors with severity level “error”.
  6. Use Morgan to log request body for debugging input issues.
  7. Add resolver that validates unique username before inserting into DB.
  8. Create JWT tokens with expiry time and reject expired tokens.
  9. Implement middleware to decode JWT and attach user to context.
  10. Restrict salary field in Employee type – only ADMIN can see it.
  11. Add role-based access so MANAGER can view team, but not edit.
  12. Implement query me that fetches logged-in user data from JWT.
  13. Write updatePassword mutation that requires valid JWT.
  14. Add role-based authorization: deletePost only for AUTHOR or ADMIN.
  15. Create typingIndicator(chatId) subscription when user starts typing.
  16. Implement subscription stockPriceUpdated(symbol) that streams stock updates.
  17. Build subscription commentAdded(postId) with filtering by postId.
  18. Secure subscription connection by validating JWT at handshake.
  19. Add subscription notificationReceived(userId) to deliver user-specific notifications.
  20. Build real-time leaderboard subscription scoreUpdated(gameId).

 Advanced Questions

  1. Implement GraphQL directive @auth(role:”ADMIN”) to auto-protect resolvers.
  2. Add custom error class TokenExpiredError and handle expired JWT differently.
  3. Implement refresh token mutation refreshToken with rotation logic.
  4. Build field-level auth middleware so different roles see different subsets of fields.
  5. Add real-time subscription auctionBidPlaced(itemId) with highest bid updates.
  6. Create scalable chat app with messageAdded(roomId) subscription.
  7. Log subscription failures with Winston (unauthorized connections).
  8. Implement federation-style role checks for multiple GraphQL services.
  9. Add subscription deliveryLocationUpdated(orderId) for live order tracking map.
  10. Implement role-based subscription userReported visible only to ADMIN.