# API Style Selection (2025)

> REST vs GraphQL vs tRPC - Hangi durumda hangisi?

## Decision Tree

```
Who are the API consumers?
│
├── Public API / Multiple platforms
│   └── REST + OpenAPI (widest compatibility)
│
├── Complex data needs / Multiple frontends
│   └── GraphQL (flexible queries)
│
├── TypeScript frontend + backend (monorepo)
│   └── tRPC (end-to-end type safety)
│
├── Real-time / Event-driven
│   └── WebSocket + AsyncAPI
│
└── Internal microservices
    └── gRPC (performance) or REST (simplicity)
```

## Comparison

| Factor                  | REST             | GraphQL      | tRPC         |
| ----------------------- | ---------------- | ------------ | ------------ |
| **Best for**            | Public APIs      | Complex apps | TS monorepos |
| **Learning curve**      | Low              | Medium       | Low (if TS)  |
| **Over/under fetching** | Common           | Solved       | Solved       |
| **Type safety**         | Manual (OpenAPI) | Schema-based | Automatic    |
| **Caching**             | HTTP native      | Complex      | Client-based |

## Selection Questions

1. Who are the API consumers?
2. Is the frontend TypeScript?
3. How complex are the data relationships?
4. Is caching critical?
5. Public or internal API?