description GraphQL API Design Overview
GraphQL provides a powerful alternative to REST by allowing clients to request *exactly* the data they need in a single request. Mastery involves designing robust schemas, implementing resolvers efficiently, and understanding query complexity analysis. It solves the perennial problem of over-fetching (getting too much data) and under-fetching (requiring multiple round trips), leading to faster, more predictable client applications.
help GraphQL API Design FAQ
Why use GraphQL instead of REST for an API?
GraphQL lets clients request exactly the fields they need from a single endpoint, eliminating the over-fetching and multi-round-trip problems of REST. It was created at Facebook around 2012 and open-sourced in 2015, so the ecosystem is mature.
What is the N+1 problem in GraphQL and how do you solve it?
Because each field can have its own resolver, a single query can trigger one database hit per related object. The standard fix is batching with Facebook's open-source DataLoader library, which collapses those into grouped queries.
How do you stop clients from sending expensive or malicious queries?
You layer on query depth and complexity analysis, timeouts, and persisted queries, where only pre-approved query documents can execute. Apollo Server is the most common framework for implementing these controls.
Who actually uses GraphQL in production?
GitHub's public v4 API is GraphQL, and Shopify exposes its Storefront API in GraphQL as well. Facebook uses it internally, which is strong validation for API design interviews and portfolio projects.
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