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20 interview questions on GraphQLfor developers (2026)

Test your technical skills before an interview of GraphQL with 20 corrected questions. Beginner, Intermediate or Expert level.

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20 questions
Easy
1 vote54 runs0 comment

Using inline fragments for different types in GraphQL

IT Architect
Anasat Apr 19, 2024
Easy
1 vote51 runs0 comment

Create a new review and return its details

IT Architect
Anasat Apr 19, 2024
Easy
0 vote57 runs0 comment

What will be the result of this GraphQL query if the user has no posts?

IT Architect
Maxime Javauxat Nov 26, 2024
Medium
0 vote48 runs0 comment

How to handle errors in GraphQL?

IT Architect
Anasat Apr 19, 2024
Easy
0 vote48 runs0 comment

GraphQL is a query language for your API.

IT Architect
Anasat Apr 19, 2024
Medium
0 vote48 runs0 comment

What are variables in GraphQL?

IT Architect
Anasat Apr 19, 2024
Easy
0 vote47 runs0 comment

What is the main role of a "resolver" in GraphQL?

IT Architect
functions
Maxime Javauxat Nov 26, 2024
Easy
0 vote47 runs0 comment

What are the possible types of a GraphQL field?

IT Architect
Anasat Apr 19, 2024
Medium
0 vote46 runs0 comment

Write a GraphQL query to get all users with the role USER

IT Architect
Anasat Apr 19, 2024
Easy
0 vote46 runs0 comment

What are the differences between interfaces and unions in GraphQL?

IT Architect
Anasat Apr 19, 2024
Easy
0 vote46 runs0 comment

What is the purpose of interfaces in GraphQL?

IT Architect
Anasat Apr 19, 2024
Medium
0 vote45 runs0 comment

What is the role of the schema in GraphQL?

IT Architect
schema
data types
queries
mutations
Maxime Javauxat Nov 26, 2024
Easy
0 vote44 runs0 comment

What was the business need that drove Facebook to develop GraphQL?

IT Architect
mobile
optimization
Dragon parfaitat Nov 28, 2024
Easy
0 vote44 runs0 comment

What is a "mutation" in GraphQL?

IT Architect
operations
data
Maxime Javauxat Nov 26, 2024
Easy
0 vote39 runs0 comment

What does a subscription in GraphQL allow you to do?

IT Architect
real-time
updates
Maxime Javauxat Nov 26, 2024
Expert
-1 vote66 runs
3 comments

What is the type of the return value of a GraphQL query?

IT Architect
Anasat Apr 19, 2024
Easy
-1 vote64 runs
1 comment

What is the main advantage of GraphQL over REST?

IT Architect
data
Maxime Javauxat Nov 26, 2024
Easy
-1 vote51 runs
1 comment

What is the response to this GraphQL query?

IT Architect
Maxime Javauxat Nov 26, 2024
Easy
-2 votes47 runs
3 comments

What is a GraphQL schema?

IT Architect
Anasat Apr 19, 2024
Easy
-2 votes46 runs
3 comments

What are variables in GraphQL?

IT Architect
Anasat Apr 19, 2024