REST vs GraphQL APIs: When to Use Each One

The choice between REST and GraphQL isn't about which is "better" — it's about which fits your use case. Let's look at the characteristics of each approach with practical examples.

REST: The Established Standard

// REST: Multiple endpoints, each with its own responsibility
GET /api/users           // List all users
GET /api/users/123       // Specific user
GET /api/users/123/posts // User 123's posts
POST /api/users          // Create user
PUT /api/users/123       // Update user
DELETE /api/users/123    // Delete user

Advantages of REST 1. **Simplicity**: Easy to understand and implement 2. **Caching**: HTTP cache works natively 3. **Tooling**: Mature, well-documented ecosystem 4. **Scalability**: Battle-tested in production

Disadvantages of REST 1. **Over-fetching**: Returns all fields even when you only need the name 2. **Under-fetching**: Multiple requests needed for related data 3. **Versioning**: Breaking changes affect clients

GraphQL: Declarative Flexibility

# GraphQL: One endpoint, flexible queries
query {
  user(id: "123") {
    name
    email
    posts {
      title
      createdAt
    }
  }
}

Advantages of GraphQL 1. **No Over/Under-fetching**: Get exactly what you need 2. **Strong Typing**: Schema is defined and validated 3. **Evolution**: Add fields without breaking clients 4. **Batching**: Solves N+1 problems automatically

Disadvantages of GraphQL 1. **Complexity**: Higher learning curve 2. **Caching**: Requires custom implementation 3. **File Uploads**: Needs specific solutions 4. **Rate Limiting**: More complex to implement

When to Use REST

- Public APIs: Simplicity for external developers - Simple resources: Direct CRUD operations - Mobile apps: HTTP cache is crucial - Microservices: Internal service communication

When to Use GraphQL

- Complex frontends: Multiple components with different data needs - Mobile applications: Reduce number of requests - Microservices: Aggregator pattern - Rapid evolution: Schema in constant change

Conclusion

The choice between REST and GraphQL depends on your specific context:

- REST for simplicity, caching, and a mature ecosystem - GraphQL for flexibility, efficiency, and rapid evolution - Hybrid to get the best of both worlds

There's no absolute "best" — only the right tool for the right problem.

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