GraphQL Interview Questions: Tips to Prepare

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We'll discuss some common GraphQL interview questions and provide tips on how to prepare and excel in your next GraphQL interview.
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GraphQL is a powerful query language that enables developers to build efficient and flexible APIs. With its increasing popularity, more and more companies are adopting GraphQL to enhance their APIs. As a result, there is a growing demand for GraphQL developers in the job market.

Why is GraphQL so popular?

Before diving into the interview questions, it's essential to understand why GraphQL is so popular. Here are some reasons why:

  • Efficiency: GraphQL reduces the number of API requests required to fetch data, resulting in faster and more efficient data retrieval.

  • Flexibility: GraphQL allows developers to query only the data they need, enabling them to build flexible and dynamic APIs that can adapt to changing requirements.

  • Type Safety: GraphQL has a strongly typed schema that ensures data consistency and provides clear documentation.

  • Real-time capabilities: GraphQL supports real-time data with subscriptions, making it an excellent choice for building reactive applications.

Common GraphQL Interview Questions

  • What is GraphQL? - This is a fundamental question that you must be able to answer. Be sure to explain the basics of GraphQL, including its benefits and how it differs from REST.

  • What is a GraphQL schema? - The schema is the foundation of a GraphQL API, and it defines the available types of data and operations. Explain what a schema is, its components, and how it is used to validate queries.

  • What are resolvers? - Resolvers are functions that resolve a specific field on a GraphQL object. Be prepared to explain how resolvers work, their purpose, and how they can be used to handle complex queries.

  • What is a mutation in GraphQL? - Mutations are operations that modify data on the server. Be sure to explain how mutations work, their syntax, and their purpose in a GraphQL API.

  • What are subscriptions in GraphQL? - Subscriptions allow clients to receive real-time updates from a GraphQL API. Be prepared to explain how subscriptions work, their syntax, and how they can be used to build reactive applications.

  • What is the difference between a query and a mutation? - Queries are operations that retrieve data from the server, while mutations modify data on the server. Be prepared to explain the difference between the two and provide examples.

  • How does GraphQL handle authentication and authorization? - GraphQL does not have built-in support for authentication and authorization. Be prepared to explain different authentication and authorization mechanisms and how they can be integrated with a GraphQL API.

Tips to Prepare and Excel in a GraphQL Interview

Here are some tips to help you prepare for your next GraphQL interview:

  • Know the basics: Make sure you have a solid understanding of the basics of GraphQL, including its benefits, syntax, and how it differs from REST.

  • Practice with sample projects: Build sample projects to practice implementing GraphQL APIs and resolving queries. This will help you gain hands-on experience and improve your understanding of GraphQL.

  • Be familiar with the tools: Familiarize yourself with the tools commonly used in GraphQL development, such as GraphQL Playground, Apollo Server, and Prisma.

  • Stay up to date: Keep up with the latest developments in GraphQL, including new features and best practices.

  • Highlight your experience: Be sure to highlight your experience with GraphQL in your resume and during the interview. Provide examples of projects you've worked on and your contributions to them.


GraphQL is an exciting technology that offers developers powerful tools for building efficient and flexible APIs. As more and more companies adopt GraphQL, the demand for skilled GraphQL developers is increasing. By understanding the basics of GraphQL, common interview questions, and following the tips mentioned above, you can prepare yourself for a successful GraphQL interview.

Remember to practice, stay up to date, and showcase your experience during the interview. With the right preparation and attitude, you can excel in your next GraphQL interview and land your dream job.

If you're looking for more resources to prepare for your GraphQL interview, check out the following links:

Best of luck with your GraphQL interview!