GraphQL Interview Questions Your Guide to Success
GraphQL is a modern API query language enabling clients to request exactly what they need. Jobpe offers interview questions covering schemas, queries, mutations, and subscriptions.
graphql
- API
What is GraphQL and how does it differ from REST?
GraphQL is a query language for APIs that allows clients to request exactly the data they need, unlike REST which...
Explain the core components of a GraphQL schema.
A GraphQL schema defines types, queries, mutations, and subscriptions that describe what data clients can request or modify.
How does GraphQL handle real-time data?
GraphQL supports real-time updates through subscriptions, enabling clients to receive data changes as they happen.
What are resolvers in GraphQL?
Resolvers are functions that handle fetching the data for a specific field in a query.
Describe how GraphQL enables efficient data fetching.
Clients specify exactly what data they need, reducing over-fetching and under-fetching of data.
How do you handle errors in GraphQL?
Errors are returned in a structured way alongside data, allowing clients to handle partial success or failure gracefully.
What are the differences between queries, mutations, and subscriptions?
Queries fetch data, mutations modify data, and subscriptions listen for real-time updates.
Explain how GraphQL supports schema stitching or federation.
Schema stitching and federation allow combining multiple GraphQL services into a unified API.
What are some security concerns with GraphQL and how are they mitigated?
Concerns include query complexity and injection; mitigated by query depth limiting, rate limiting, and validation.
How do you optimize performance in GraphQL APIs?
Techniques include caching, batching requests, and avoiding expensive resolvers.
API
What is GraphQL and how does it differ from REST?
GraphQL is a query language for APIs that allows clients to request exactly the data they need, unlike REST which often returns fixed data structures.
Explain the core components of a GraphQL schema.
A GraphQL schema defines types, queries, mutations, and subscriptions that describe what data clients can request or modify.
How does GraphQL handle real-time data?
GraphQL supports real-time updates through subscriptions, enabling clients to receive data changes as they happen.
What are resolvers in GraphQL?
Resolvers are functions that handle fetching the data for a specific field in a query.
Describe how GraphQL enables efficient data fetching.
Clients specify exactly what data they need, reducing over-fetching and under-fetching of data.
How do you handle errors in GraphQL?
Errors are returned in a structured way alongside data, allowing clients to handle partial success or failure gracefully.
What are the differences between queries, mutations, and subscriptions?
Queries fetch data, mutations modify data, and subscriptions listen for real-time updates.
Explain how GraphQL supports schema stitching or federation.
Schema stitching and federation allow combining multiple GraphQL services into a unified API.
What are some security concerns with GraphQL and how are they mitigated?
Concerns include query complexity and injection; mitigated by query depth limiting, rate limiting, and validation.
How do you optimize performance in GraphQL APIs?
Techniques include caching, batching requests, and avoiding expensive resolvers.
