20 interview questions on GraphQL for developers (2025)

Easy

1 vote43 runs0 comment

Using inline fragments for different types in GraphQL

IT Architect

Anasat Apr 19, 2024

Easy

1 vote41 runs0 comment

Create a new review and return its details

IT Architect

Anasat Apr 19, 2024

Easy

0 vote47 runs0 comment

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

IT Architect

Maxime Javauxat Nov 26, 2024

Easy

0 vote40 runs0 comment

What are the possible types of a GraphQL field?

IT Architect

Anasat Apr 19, 2024

Medium

0 vote39 runs0 comment

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

IT Architect

Anasat Apr 19, 2024

Medium

0 vote39 runs0 comment

How to handle errors in GraphQL?

IT Architect

Anasat Apr 19, 2024

Easy

0 vote39 runs0 comment

What are the differences between interfaces and unions in GraphQL?

IT Architect

Anasat Apr 19, 2024

Easy

0 vote39 runs0 comment

What is the purpose of interfaces in GraphQL?

IT Architect

Anasat Apr 19, 2024

Easy

0 vote39 runs0 comment

GraphQL is a query language for your API.

IT Architect

Anasat Apr 19, 2024

Medium

0 vote39 runs0 comment

What are variables in GraphQL?

IT Architect

Anasat Apr 19, 2024

Easy

0 vote34 runs0 comment

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

IT Architect

mobile

optimization

Dragon parfaitat Nov 28, 2024

Easy

0 vote34 runs0 comment

What is a "mutation" in GraphQL?

IT Architect

operations

data

Maxime Javauxat Nov 26, 2024

Medium

0 vote34 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 vote33 runs0 comment

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

IT Architect

functions

Maxime Javauxat Nov 26, 2024

Easy

0 vote32 runs0 comment

What does a subscription in GraphQL allow you to do?

IT Architect

real-time

updates

Maxime Javauxat Nov 26, 2024

Expert

-1 vote58 runs

3 comments

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

IT Architect

Anasat Apr 19, 2024

Easy

-1 vote57 runs

1 comment

What is the main advantage of GraphQL over REST?

IT Architect

data

Maxime Javauxat Nov 26, 2024

Easy

-1 vote32 runs

1 comment

What is the response to this GraphQL query?

IT Architect

Maxime Javauxat Nov 26, 2024

Easy

-2 votes39 runs

3 comments

What are variables in GraphQL?

IT Architect

Anasat Apr 19, 2024

Easy

-2 votes39 runs

3 comments

What is a GraphQL schema?

IT Architect

Anasat Apr 19, 2024

20 interview questions on GraphQLfor developers (2025)

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

Using inline fragments for different types in GraphQL

Create a new review and return its details

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

What are the possible types of a GraphQL field?

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

How to handle errors in GraphQL?

What are the differences between interfaces and unions in GraphQL?

What is the purpose of interfaces in GraphQL?

GraphQL is a query language for your API.

What are variables in GraphQL?

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

What is a "mutation" in GraphQL?

What is the role of the schema in GraphQL?

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

What does a subscription in GraphQL allow you to do?

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

What is the main advantage of GraphQL over REST?

What is the response to this GraphQL query?

What are variables in GraphQL?

What is a GraphQL schema?