Essential GraphQL Interview Questions and Answers (2024)
- Q: What is GraphQL?
- Q: Is GraphQL a database?
- Q: What are the features/advantages of GraphQL?
- Q: What is a Resolver in GraphQL?
Q: What is GraphQL?
Ans:
GraphQL is an open source server-side technology developed by Facebook to optimize RESTful API calls, it is a query language for APIs and a runtime for fulfilling those queries with your existing data.
Q: Is GraphQL a database?
Ans:
GraphQL is often confused with a database technology. GraphQL is a query language for APIs, not databases.
Q: What are the features/advantages of GraphQL?
Ans:
- A need for more efficient data loading has been created by increased mobile use.
- A variety of different clients: REST makes it difficult to create an API that meets their needs as it returns a fixed data structure.
- Requirements for faster feature development: To make a change on the client side of REST, we always have to modify the server side to accommodate it which slows down product iterations.
- Great fit for complex systems and microservices.
- Fetching data with a single API call.
- No over- and under-fetching problems.
- Tailoring requests to your needs.
- Validation and type checking out-of-the-box.
- API evolution without versioning.
- Code-sharing: GraphQL fields used in different queries may be shared at a higher component level for re-use.
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Q: What is a Resolver in GraphQL?
Ans:
In GraphQL, a resolver is being used to handle queries and produce a response to the GraphQL query.
greeting:() => {
return "Hello !!!"
}
books:() => db.books.list()
bookIdById:(root,args,context,info) => {
return db.books.get(args.id);
}