API / GraphQL Interview Questions

How is GraphQL different from REST?

Single endpoint instead of multiple endpoints
Client controls data shape
No over-fetching or under-fetching
Strongly typed schema

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What is GraphQL? Is GraphQL based on Database Technology? How GraphQL uses the data loading process? Advantages of GraphQL over REST API. What is Over-fetching in GraphQL? What is Under-fetching in GraphQL? How to perform Error Handling in GraphQL? What type of response you get using a GraphQL query? Advantages of GraphQL. Disadvantages of GraphQL. Explain GraphQL Schema. name: String! Is this a valid field type in GraphQL? What does an exclamation mark after a field's type indicate in GraphQL? What is SDL in GraphQL? What are the main operations that GraphQL supports? What is a mutation in GraphQL? Difference between a mutation and a query in GraphQL. What are scalar types in GraphQL? What is an exclamation point (!) in GraphQL? What are resolvers in GraphQL? Supported GraphQL Data types. How is GraphQL different from REST? What are the main components of GraphQL? What is a Subscription in GraphQL? What is N+1 Problem in GraphQL? What is DataLoader? What is Schema Stitching? What is Federation? How is Error Handling done in GraphQL? Is GraphQL strongly typed? What are Directives in GraphQL? What is the difference between Schema Stitching and Federation?

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