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2026-07-29 16:01
GraphQL

Nested Query

QueryParseValidateMedium
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What you will learn

  • N+1 query problem: one outer query triggering N inner queries — detect via resolver tracing
  • Query depth limits are your production safety net — test that deep queries are rejected
  • Circular relations require explicit termination — assert that A→B→A terminates, not stack-overflows

Description

Fetch related data in a single query (user with orders).

Test Scenario

const query = `
  query {
    user(id: "1") {
      name
      orders {
        id
        total
        items {
          product {
            name
            price
          }
        }
      }
    }
  }
`;
Endpoint/api/graphql

Testing Tips

  • •Traverse relationships in one query
  • •Avoid N+1 query problem
  • •Use fragments for reusability
// Playwright API Testing - GraphQL
import { test, expect } from '@playwright/test';


test('GraphQL query', async ({ request }) => {
  const response = await request.post('/api/graphql', {
    data: {
      query: `
        query {
          users {
            id
            name
            email
          }
        }
      `
    }
  });


  expect(response.ok()).toBeTruthy();
  const { data } = await response.json();
  expect(data.users).toBeDefined();
});

Challenge ID: graphql-nested-query

2 frameworks available

API Playground

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Endpoint: /api/graphql

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