30+ Top Interview Questions and Answers (2024)

Ques 1

Explain the difference between GraphQL and REST.

GraphQL is a query language that allows clients to request the specific data they need, while REST is an architectural style that uses predefined endpoints to expose data. GraphQL provides more flexibility and efficiency in fetching data compared to REST.

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Ques 2

Explain GraphQL schemas and types.

A GraphQL schema defines the types of data that can be queried and the relationships between them. Types represent the shape of the data, and the schema serves as a contract between the client and the server regarding the structure of the API.

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Ques 3

Explain the concept of fragments in GraphQL.

Fragments in GraphQL allow you to define reusable sets of fields that can be included in multiple queries. They help in avoiding duplication of field definitions and make queries more modular.

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Ques 4

Differentiate between a query and a mutation in GraphQL.

A query is used to fetch data from the server, while a mutation is used to modify data on the server. Queries are read-only operations, and mutations are used for any operation that causes a change in the data.

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Ques 5

What is the role of directives in GraphQL?

Directives in GraphQL are used to modify the behavior of a field or an entire query. They provide a way to conditionally include or skip fields, apply transformations, and control the execution of a query.

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Ques 6

What is the purpose of the `context` object in GraphQL resolvers?

The `context` object in GraphQL resolvers is used to share contextual information, such as authentication details or database connections, among different parts of the application. It is often passed as an argument to resolvers.

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Ques 7

How does GraphQL handle circular dependencies in schemas?

GraphQL allows the use of forward and backward references in a schema, but circular dependencies can be resolved using lazy loading or by using the `GraphQLObjectType` constructor to create types that reference each other.

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Ques 8

Explain the concept of a union type in GraphQL.

A union type in GraphQL allows a field to return different types of objects. It is useful when a field can have multiple types, and the client needs to handle each type differently.

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Ques 9

What is the role of the `@deprecated` directive in GraphQL?

The `@deprecated` directive in GraphQL is used to mark a field or enum value as deprecated. It provides information to clients about the deprecation and suggests an alternative field or value to use.

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Ques 10

What is the purpose of the `fragment` keyword in GraphQL?

The `fragment` keyword in GraphQL is used to define reusable sets of fields that can be included in queries. Fragments help in organizing and reusing common field selections across multiple queries.

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Ques 11

What is the purpose of the `fetchPolicy` option in Apollo Client for GraphQL?

The `fetchPolicy` option in Apollo Client allows developers to control how queries are fetched and updated. It provides options like 'cache-first,' 'network-only,' and 'no-cache' to customize the caching behavior.

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Ques 12

What is the difference between a schema and a type in GraphQL?

A schema in GraphQL is a collection of types that define the structure of the API. Types, on the other hand, represent the shape of the data, including scalar types, object types, and custom types defined in the schema.

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Ques 13

What is the purpose of the `alias` feature in GraphQL queries?

The `alias` feature in GraphQL allows clients to rename the result of a field in the response. It is useful when multiple fields in a query have the same name or when clients want to provide a different name for clarity.

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Interview Questions and Answers

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Interview Questions and Answers

Intermediate / 1 to 5 years experienced level questions & answers

Explain the difference between GraphQL and REST.

Simpan untuk Revisi

Explain GraphQL schemas and types.

Simpan untuk Revisi

Explain the concept of fragments in GraphQL.

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Differentiate between a query and a mutation in GraphQL.

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What is the role of directives in GraphQL?

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What is the purpose of the `context` object in GraphQL resolvers?

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How does GraphQL handle circular dependencies in schemas?

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Explain the concept of a union type in GraphQL.

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What is the role of the `@deprecated` directive in GraphQL?

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What is the purpose of the `fragment` keyword in GraphQL?

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What is the purpose of the `fetchPolicy` option in Apollo Client for GraphQL?

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What is the difference between a schema and a type in GraphQL?

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What is the purpose of the `alias` feature in GraphQL queries?

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