GraphQL vs REST: A Practical Guide from Beginner to Expert

REST uses URLs and HTTP methods; GraphQL uses a single endpoint and a query language. This guide goes from basics to expert design choices.

Beginner: What’s the Difference?

REST: Multiple endpoints (e.g. /users, /users/1). Client gets fixed responses; sometimes too much (over-fetching) or too little (under-fetching), so you call more endpoints.

GraphQL: One endpoint (e.g. /graphql). Client sends a query describing exactly the fields it needs; server returns only those.

1query {
2  user(id: 1) {
3    name
4    email
5    posts { title }
6  }
7}

Intermediate: Queries, Mutations, and Subscriptions

1mutation CreatePost($input: CreatePostInput!) {
2  createPost(input: $input) {
3    id
4    title
5    publishedAt
6  }
7}

REST equivalent: POST /posts with JSON body.

Advanced: N+1, Caching, and Security

Expert: When to Choose Which

| Use REST when | Use GraphQL when |

|---------------|------------------|

| Simple CRUD, cacheable resources | Complex, nested data needs |

| Public HTTP caching is important | Many clients with different shapes |

| Team is small and REST is enough | Mobile + web need different payloads |

Expert: Schema Design and Performance

Hybrid: Expose REST for key resources and GraphQL for flexible, product-driven APIs. Validate and format JSON with our [JSON Formatter](/tools/json-formatter/) tool.