What is a GraphQL schema and why is it important?

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GraphQL Interview Questions

  1. [JUNIOR] What is GraphQL and why is it used?
  2. [JUNIOR] How does GraphQL differ from REST?
  3. [JUNIOR] What is a GraphQL query and how is it structured?
  4. [JUNIOR] What is a GraphQL mutation?
  5. [JUNIOR] What is a GraphQL schema and why is it important?
  6. [JUNIOR] What is a resolver in GraphQL?
  7. [MID] How does GraphQL handle over-fetching and under-fetching of data compared to REST?
  8. [SENIOR] What is the N+1 problem in GraphQL and how do you mitigate it?
  9. [JUNIOR] What is the difference between queries, mutations, and subscriptions in GraphQL?
  10. [JUNIOR] What are the primary benefits of using GraphQL over REST?
  11. [JUNIOR] What is a GraphQL subscription and how does it work?
  12. [MID] How do you implement pagination in a GraphQL API?
  13. [MID] How do you handle errors in GraphQL?
  14. [MID] How do you implement authentication in a GraphQL API?
  15. [SENIOR] How do you implement batching and caching in GraphQL resolvers?
  16. [SENIOR] What are the security risks associated with GraphQL and how do you address them?
  17. [SENIOR] How do you optimize GraphQL query performance with large datasets?
  18. [JUNIOR] What are fragments in GraphQL and how are they used?
  19. [JUNIOR] What are GraphQL directives and how are they used?
  20. [JUNIOR] What are the main components of a GraphQL schema?
  21. [MID] What does it mean that GraphQL is strongly typed and how does the type system work?
  22. [MID] How is caching implemented in GraphQL?
  23. [MID] How does authorization work in GraphQL?
  24. [MID] What is introspection in GraphQL and what are its benefits and drawbacks?
  25. [MID] How do you use variables in GraphQL queries?
  26. [MID] What are input types in GraphQL and how are they used?
  27. [SENIOR] What is schema stitching in GraphQL and when would you use it?
  28. [SENIOR] What is Apollo Federation and what are its benefits in a microservices architecture?
  29. [SENIOR] How do you handle API versioning and backward compatibility in GraphQL?
  30. [SENIOR] How can GraphQL be used with a microservices architecture?
  31. [SENIOR] How would you design a GraphQL schema for a complex system with multiple entities?
  32. [EXPERT] How does DataLoader work internally and what are its limitations for solving the N+1 problem?
  33. [EXPERT] How do you implement query complexity analysis and depth limiting to prevent abuse?
  34. [JUNIOR] What is the difference between scalar types and object types in GraphQL?
  35. [MID] What is a GraphQL interface and when would you use it?
  36. [MID] What are union types in GraphQL and when would you use them?
  37. [MID] What is the significance of non-nullable types in GraphQL?
  38. [MID] What is the role of the context object in GraphQL resolvers?
  39. [MID] How do you handle nested queries and deeply nested data in GraphQL?
  40. [SENIOR] What are persisted queries in GraphQL and why would you use them?
  41. [SENIOR] How would you implement custom scalar types in GraphQL?
  42. [SENIOR] How would you migrate an existing REST API to GraphQL?
  43. [SENIOR] What is relay-style cursor-based pagination and how does it differ from offset-based pagination?
  44. [SENIOR] What strategies do you use for error handling in GraphQL resolvers?
  45. [EXPERT] What are the trade-offs between schema-first and code-first approaches to GraphQL development?
  46. [EXPERT] How would you implement field-level authorization in a GraphQL schema?
  47. [MID] What is the purpose of the __typename field in GraphQL?
  48. [MID] What is the purpose of the @deprecated directive in GraphQL?
  49. [MID] What tools and frameworks can be used to build GraphQL APIs on the server side?
  50. [SENIOR] How do you implement file uploading in GraphQL?
  51. [SENIOR] What is resolver middleware in GraphQL and how is it used?
  52. [SENIOR] How would you handle data aggregation in GraphQL?
  53. [SENIOR] How do you ensure backward compatibility when evolving a GraphQL schema?
  54. [EXPERT] What is schema delegation and how does it work in a federated GraphQL setup?
  55. [EXPERT] How do you implement distributed tracing and monitoring for GraphQL APIs in production?
  56. [MID] What is the function of the extend keyword in GraphQL?
  57. [SENIOR] How do you mock a GraphQL server for frontend development?
  58. [EXPERT] How would you compare GraphQL subscriptions to other real-time solutions like WebSockets and Server-Sent Events?
  59. [EXPERT] How do you optimize GraphQL queries specifically for mobile applications with constrained bandwidth?
  60. [EXPERT] How do you handle localization and internationalization in a GraphQL API?
  61. [EXPERT] What are the edge cases and challenges when implementing custom directives in GraphQL?