Suleman Ahmed

Suleman Ahmed - BlogUnderstanding REST vs GraphQL: Choosing the Right API Style

Designing API architectures is a core part of full-stack engineering. REST has been the dominant paradigm for years, but GraphQL offers a powerful alternative. Let's evaluate both approaches.

1. REST APIs: The Standard

REST (Representational State Transfer) is resource-based. You have multiple endpoints representing resources (e.g., /api/users, /api/posts), using standard HTTP methods (GET, POST, PUT, DELETE).

2. GraphQL: Client-Driven Queries

GraphQL uses a single endpoint (usually /graphql) and allows the client to define the structure of the data they need. This eliminates the over-fetching and under-fetching issues common in REST.

GraphQL Schema & Query Example

Here is how you define a type in GraphQL Schema definition language:

{"value":{"_key":"5cfc56e52079","_type":"code","code":"type Post {\n id: ID!\n title: String!\n content: String!\n author: User!\n}\n\ntype User {\n id: ID!\n name: String!\n email: String!\n}","filename":"","language":"graphql"},"isInline":false,"index":7}

If a client only needs the post title and the author's name, they can request exactly that:

{"value":{"_key":"c121d27622dc","_type":"code","code":"query GetPostWithAuthor($postId: ID!) {\n post(id: $postId) {\n title\n author {\n name\n }\n }\n}","filename":"","language":"javascript"},"isInline":false,"index":9}

Which One Should You Choose?

  • Choose REST if your application relies heavily on browser caching, simple crud routes, and standard HTTP tooling.
  • Choose GraphQL if your data is highly relational, you have multiple clients (web, mobile) needing different fields, and you want strong schema type safety.

In many modern applications, a hybrid approach is also common, exposing REST for public consumers and GraphQL for internal applications.