Code snippets — Graphql Vs Rest

snippet-2.txt

# One request instead of 5
query DashboardData {
  currentUser {
    name
    recentOrders(limit: 10) {
      id
      total
      status
      items { name quantity }
    }
    notifications(unread: true) {
      message
      createdAt
    }
  }
}

snippet.js

// Without DataLoader — N+1 queries
const resolvers = {
  Post: {
    author: (post) => User.findById(post.authorId) // 1 query per post!
  }
}

// With DataLoader — 1 batched query
const userLoader = new DataLoader(async (ids) => {
  const users = await User.findAll({ where: { id: ids } });
  return ids.map(id => users.find(u => u.id === id));
});

const resolvers = {
  Post: {
    author: (post) => userLoader.load(post.authorId)
  }
}

snippet.sh

# REST is easy to explore and debug
curl -X GET https://api.example.com/users/42 \
  -H "Authorization: Bearer token123"

snippet.txt

# Client asks for exactly what it needs
query {
  user(id: "42") {
    name
    email
    posts(last: 5) {
      title
      createdAt
    }
  }
}