The debate isn't about which is 'better'—it's about where the complexity should live. Do you want it in the API definition (GraphQL) or the client request (REST)?
The Over-Fetching Problem
In a traditional REST API, requesting a product often returns a massive JSON payload containing data the mobile app doesn't need—like full HTML descriptions or internal vendor IDs. This is 'Over-fetching,' and it kills mobile performance.
GET /api/products/123 → Returns 50 fields (even if you only need 2)
The GraphQL Solution: Precise Data Fetching
GraphQL allows the frontend to specify exactly what it needs. This reduces payload size and eliminates the 'N+1 problem' where the client has to make five different API calls to render a single page.
query {{ product(id: "123") {{ name, price, thumbnail }} }} → Returns ONLY those 3 fields
The 'Hidden' Cost of GraphQL
GraphQL isn't a silver bullet. It introduces significant complexity in **caching**. Because every request is a POST to a single endpoint, standard CDN caching doesn't work. You must implement Persisted Queries or specialized edge caches to avoid overloading your server.
The Verdict:
Use GraphQL for complex, data-heavy frontends (Next.js/Flutter) where flexibility is key. Use REST for simple, high-cacheable public APIs or internal microservices where predictability is priority.
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