GraphQL vs REST APIs - Which One Should You Choose?

A comparison of REST and GraphQL API approaches - understanding when to use each.

The Great API Debate

If you've been building web applications, you've likely encountered the REST vs GraphQL debate. Both are powerful approaches to building APIs, but they solve problems differently. Let's break down when each shines.

REST: The Battle-Tested Standard

REST (Representational State Transfer) has been the dominant API paradigm for over two decades. It's built around resources and HTTP methods:

GET    /users/123        → Fetch user
POST   /users            → Create user
PUT    /users/123        → Update user
DELETE /users/123        → Delete user

REST excels when:

• You have simple, resource-based data models
• Caching is critical (HTTP caching works out of the box)
• Your team is familiar with traditional HTTP semantics
• You're building public APIs with predictable access patterns

GraphQL: Precision Data Fetching

GraphQL flips the script. Instead of multiple endpoints, you have one endpoint and ask for exactly what you need:

query {
  user(id: "123") {
    name
    email
    posts(last: 5) {
      title
      publishedAt
    }
  }
}

GraphQL excels when:

• You have complex, interconnected data
• Mobile apps need to minimize data transfer
• Frontend teams want autonomy from backend changes
• You're aggregating data from multiple sources

The Over-fetching Problem

Consider fetching a user profile with their recent posts. With REST:

GET /users/123           → Returns ALL user fields
GET /users/123/posts     → Returns ALL post fields
GET /users/123/followers → Returns ALL follower data

That's 3 round trips and potentially megabytes of unused data. With GraphQL:

query {
  user(id: "123") {
    name
    avatar
    posts(limit: 3) { title }
    followersCount
  }
}

One request. Only the fields you need.

When REST Still Wins

Don't count REST out. It's still the better choice for:

1. File uploads - GraphQL's handling of binary data is awkward
2. Simple CRUD apps - Why add complexity?
3. Public APIs - REST's predictability makes documentation easier
4. Caching-heavy applications - HTTP caching is mature and well-understood

The Verdict

There's no universal winner. Many successful companies use both:

• GitHub uses GraphQL for their v4 API but kept REST for v3
• Shopify offers both REST and GraphQL APIs
• Netflix uses GraphQL for their internal microservices

My recommendation: Start with REST for simple projects. Consider GraphQL when you find yourself creating custom endpoints for specific UI needs, or when mobile performance becomes critical.

The best API is the one your team can build, maintain, and evolve effectively.