Question 1

How to implement a GraphQL server in Node.js?

Accepted Answer

Use the reference implementation graphql-js or frameworks like Apollo Server. Start by defining a schema with types and resolvers, as shown in the Star Wars example, then handle queries and mutations. The spec provides the foundation, but tooling adds convenience.

Question 2

GraphQL vs REST: which should I use?

Accepted Answer

GraphQL excels for flexible, client-driven APIs with complex data needs, reducing over-fetching. REST is better for simple, cacheable CRUD operations or when leveraging existing HTTP infrastructure. Choose based on your API's complexity and client requirements.

Question 3

Can GraphQL handle real-time data with subscriptions?

Accepted Answer

Yes, GraphQL supports subscriptions for real-time updates, but it's an extension to the core spec and requires additional server-side handling. Implementations vary, so check your chosen framework's documentation for setup details.

Question 4

How to optimize GraphQL queries for performance?

Accepted Answer

Use query batching, caching at the resolver level, and tools like DataLoader to avoid N+1 query problems. Also, limit query depth and complexity, as the spec allows validation rules to enforce this.

Question 5

Is GraphQL good for microservices?

Accepted Answer

GraphQL can act as an aggregation layer in microservices, fetching data from multiple sources. However, it introduces a single point of failure and requires careful schema stitching or federation, which adds complexity.

Question 6

What are the best practices for GraphQL schema design?

Accepted Answer

Start with a clear type system, use interfaces for shared fields, and mark non-null fields wisely. Evolve schemas with deprecations instead of breaking changes, and leverage introspection for documentation, as outlined in the spec.

GraphQL

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