GraphQL Load Testing

Test your GraphQL resolvers under pressure

Send realistic GraphQL queries and mutations at scale. Identify slow resolvers, N+1 query problems, and connection pool exhaustion before they affect users.

What you get

Queries, mutations, and subscriptions
Variable parameterization
Authentication header injection
Per-operation latency tracking
Complexity-based testing scenarios
Works with Apollo, Hasura, and any GraphQL server

graphql-test.js

import http from 'k6/http';
import { check } from 'k6';

export const options = { vus: 50, duration: '3m' };

const query = `
  query GetProducts($limit: Int!) {
    products(limit: $limit) {
      id
      name
      price
      reviews { rating }
    }
  }
`;

export default function () {
  const res = http.post('https://api.example.com/graphql', 
    JSON.stringify({ query, variables: { limit: 20 } }),
    { headers: { 'Content-Type': 'application/json' } }
  );
  check(res, {
    'status 200': (r) => r.status === 200,
    'no errors': (r) => !JSON.parse(r.body).errors,
  });
}

Frequently Asked Questions

Can I test GraphQL subscriptions?

k6 supports WebSocket connections, so you can test GraphQL subscriptions over WebSocket. Use the k6/ws module to establish and maintain subscription connections.

How do I test different query complexities?

Create separate test scenarios with varying query depths and field selections. Use k6 stages to gradually increase complexity and VU count to find your server's limits.