{"id":"46a33d0e-c9a4-436c-b6ac-bac672b00f98","shortId":"MqHEeh","kind":"skill","title":"k6-load-testing","tagline":"Comprehensive k6 load testing skill for API, browser, and scalability testing. Write realistic load scenarios, analyze results, and integrate with CI/CD.","description":"# k6 Load Testing\n\n## Overview\n\nk6 is a modern, developer-centric load testing tool that helps you write and execute performance tests for HTTP APIs, WebSocket endpoints, and browser scenarios. This skill provides comprehensive guidance on writing realistic load tests, configuring test scenarios (smoke, load, stress, spike, soak), analyzing results, and integrating with CI/CD pipelines.\n\nUse this skill when you need to validate system performance, identify bottlenecks, ensure SLA compliance, or catch performance regressions before deployment.\n\n---\n\n## When to Use This Skill\n\n- Use when you need to load test HTTP APIs, WebSocket endpoints, or browser scenarios\n- Use when setting up performance regression tests in CI/CD\n- Use when analyzing system behavior under various load conditions\n- Use when comparing performance between code changes\n- Use when validating SLA requirements and performance budgets\n\n---\n\n## k6 Basics\n\n### Installation\n\n```bash\n# macOS\nbrew install k6\n\n# Windows\nchoco install k6\n\n# Linux\nsudo gpg -k\nsudo gpg --no-default-keyring --keyring /usr/share/keyrings/k6-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys C5AD17C747E3415A3642D57D77C6C491D6AC1D69\necho \"deb [signed-by=/usr/share/keyrings/k6-archive-keyring.gpg] https://dl.k6.io/deb stable main\" | sudo tee /etc/apt/sources.list.d/k6.list\nsudo apt-get update\nsudo apt-get install k6\n```\n\n### Quick Start\n\n```javascript\n// simple-test.js\nimport http from 'k6/http';\nimport { check, sleep } from 'k6';\n\nexport const options = {\n  vus: 10,\n  duration: '30s',\n};\n\nexport default function () {\n  const res = http.get('https://httpbin.test.k6.io/get');\n  \n  check(res, {\n    'status is 200': (r) => r.status === 200,\n    'response time < 500ms': (r) => r.timings.duration < 500,\n  });\n  \n  sleep(1);\n}\n```\n\nRun with: `k6 run simple-test.js`\n\n---\n\n## Test Configuration\n\n### Common Options\n\n```javascript\nexport const options = {\n  // Virtual Users (concurrent users)\n  vus: 100,\n  \n  // Test duration\n  duration: '5m',\n  \n  // Or use stages for ramp-up/ramp-down\n  stages: [\n    { duration: '30s', target: 20 },   // Ramp up\n    { duration: '1m', target: 100 },  // Stay at 100\n    { duration: '30s', target: 0 },    // Ramp down\n  ],\n  \n  // Thresholds (SLA)\n  thresholds: {\n    http_req_duration: ['p(95)<500'],  // 95% requests < 500ms\n    http_req_failed: ['rate<0.01'],     // Error rate < 1%\n  },\n  \n  // Load zones (distributed testing)\n  ext: {\n    loadimpact: {\n      name: 'My Load Test',\n      distribution: {\n        'amazon:us:ashburn': { weight: 50 },\n        'amazon:eu: Dublin': { weight: 50 },\n      },\n    },\n  },\n};\n```\n\n### Test Types\n\n| Type | Use Case | Configuration |\n|------|----------|---------------|\n| Smoke Test | Verify basic functionality | Low VUs (1-5), short duration |\n| Load Test | Normal expected load | Target VUs based on traffic |\n| Stress Test | Find breaking point | Ramp beyond capacity |\n| Spike Test | Sudden traffic spikes | Rapid increase/decrease |\n| Soak Test | Long-term stability | Extended duration |\n\n---\n\n## HTTP Testing\n\n### Basic Requests\n\n```javascript\nimport http from 'k6/http';\nimport { check, sleep } from 'k6';\n\nexport default function () {\n  // GET request\n  const getRes = http.get('https://api.example.com/users');\n  \n  check(getRes, {\n    'GET succeeded': (r) => r.status === 200,\n    'has users': (r) => r.json('data.length') > 0,\n  });\n\n  // POST request with JSON body\n  const postRes = http.post('https://api.example.com/users', \n    JSON.stringify({ name: 'Test User', email: 'test@example.com' }),\n    {\n      headers: {\n        'Content-Type': 'application/json',\n        'Authorization': 'Bearer ' + __ENV.API_TOKEN,\n      },\n    }\n  );\n  \n  check(postRes, {\n    'POST succeeded': (r) => r.status === 201,\n    'user created': (r) => r.json('id') !== undefined,\n  });\n\n  sleep(1);\n}\n```\n\n### Request Chaining\n\n```javascript\nimport http from 'k6/http';\nimport { check } from 'k6';\n\nexport default function () {\n  // Login and extract token\n  const loginRes = http.post('https://api.example.com/login', \n    JSON.stringify({ email: 'test@example.com', password: 'password123' })\n  );\n  \n  const token = loginRes.json('access_token');\n  \n  // Use token in subsequent requests\n  const headers = {\n    'Authorization': `Bearer ${token}`,\n    'Content-Type': 'application/json',\n  };\n  \n  const profileRes = http.get('https://api.example.com/profile', {\n    headers: headers,\n  });\n  \n  check(profileRes, {\n    'profile loaded': (r) => r.status === 200,\n  });\n}\n```\n\n### Parameterized Testing\n\n```javascript\nimport http from 'k6/http';\nimport { check } from 'k6';\n\nconst usernames = ['user1', 'user2', 'user3', 'user4', 'user5'];\n\nexport default function () {\n  // Use shared array with VU-specific index\n  const username = usernames[__VU % usernames.length];\n  \n  const res = http.get(`https://api.example.com/users/${username}`);\n  \n  check(res, {\n    'user found': (r) => r.status === 200,\n  });\n}\n```\n\n---\n\n## Browser Testing (k6 Browser)\n\n```javascript\nimport { browser } from 'k6/browser';\n\nexport const options = {\n  scenarios: {\n    browser_test: {\n      executor: 'constant-vus',\n      vus: 5,\n      duration: '30s',\n      browser: {\n        type: 'chromium',\n      },\n    },\n  },\n};\n\nexport default async function () {\n  const page = await browser.newPage();\n  \n  try {\n    await page.goto('https://example.com');\n    \n    const title = await page.title();\n    console.log(`Page title: ${title}`);\n    \n    // Click and interact\n    await page.click('button[data-testid=\"submit\"]');\n    \n    // Wait for response\n    await page.waitForSelector('.success-message');\n    \n  } finally {\n    await page.close();\n  }\n}\n```\n\nInstall browser support: `k6 install chromium`\n\n---\n\n## WebSocket Testing\n\n```javascript\nimport ws from 'k6/ws';\nimport { check } from 'k6';\n\nexport default function () {\n  const url = 'wss://echo.websocket.org';\n  \n  ws.connect(url, {}, function (socket) {\n    socket.on('open', () => {\n      console.log('WebSocket connected');\n      socket.send('Hello WebSocket');\n    });\n    \n    socket.on('message', (data) => {\n      console.log(`Received: ${data}`);\n      check(data, {\n        'echo received': (d) => d.includes('Hello'),\n      });\n    });\n    \n    socket.on('close', () => {\n      console.log('WebSocket closed');\n    });\n    \n    // Send periodic messages\n    socket.setInterval(function () {\n      socket.send('ping');\n    }, 1000);\n    \n    // Close after 5 seconds\n    socket.setTimeout(function () {\n      socket.close();\n    }, 5000);\n  });\n}\n```\n\n---\n\n## Data Handling\n\n### CSV Data Source\n\n```javascript\nimport http from 'k6/http';\nimport { check } from 'k6';\nimport { SharedArray } from 'k6/data';\n\n// Option 1: Load once, shared across VUs\nconst users = new SharedArray('users', function () {\n  return open('./users.csv').split('\\n').slice(1).map(line => {\n    const [email, password] = line.split(',');\n    return { email, password };\n  });\n});\n\nexport default function () {\n  const user = users[__VU % users.length];\n  \n  const res = http.post('https://api.example.com/login',\n    JSON.stringify({ email: user.email, password: user.password })\n  );\n  \n  check(res, { 'login successful': (r) => r.status === 200 });\n}\n```\n\n### JSON Data Source\n\n```javascript\nimport http from 'k6/http';\nimport { check } from 'k6';\nimport { SharedArray } from 'k6/data';\n\nconst products = new SharedArray('products', function () {\n  return JSON.parse(open('./products.json'));\n});\n\nexport default function () {\n  const product = products[Math.floor(Math.random() * products.length)];\n  \n  const res = http.get(`https://api.example.com/products/${product.id}`);\n  \n  check(res, { 'product found': (r) => r.status === 200 });\n}\n```\n\n---\n\n## Thresholds & SLA\n\n### Basic Thresholds\n\n```javascript\nexport const options = {\n  vus: 50,\n  duration: '2m',\n  \n  thresholds: {\n    // Response time thresholds\n    http_req_duration: ['p(95)<500', 'p(99)<1000'],\n    \n    // Error rate threshold\n    http_req_failed: ['rate<0.01'],\n    \n    // Throughput threshold\n    http_reqs: ['rate>100'],\n  },\n};\n```\n\n### Advanced Thresholds\n\n```javascript\nexport const options = {\n  thresholds: {\n    // Multiple thresholds on same metric\n    http_req_duration: [\n      'p(90)<300',   // 90th percentile < 300ms\n      'p(95)<500',  // 95th percentile < 500ms\n      'p(99)<1000', // 99th percentile < 1s\n      'avg<200',    // average < 200ms\n    ],\n    \n    // Custom metrics\n    my_custom_metric: ['avg<100'],\n    \n    // Abort on threshold failure\n    'http_req_duration{method:GET}': ['p(95)<300'],\n  },\n};\n```\n\n---\n\n## Custom Metrics\n\n### Counters\n\n```javascript\nimport http from 'k6/http';\nimport { Counter, Trend, Rate, Gauge } from 'k6/metrics';\n\n// Define custom metrics\nconst myCounter = new Counter('api_calls_total');\nconst responseTime = new Trend('response_time');\nconst errorRate = new Rate('error_rate');\nconst activeUsers = new Gauge('active_users');\n\nexport default function () {\n  const res = http.get('https://api.example.com/data');\n  \n  // Increment counter\n  myCounter.add(1);\n  \n  // Add to trend (for percentiles)\n  responseTime.add(res.timings.duration);\n  \n  // Track error rate\n  errorRate.add(res.status !== 200);\n  \n  // Set gauge value\n  activeUsers.add(__VU);\n  \n  // Tagged metrics\n  const taggedRes = http.get('https://api.example.com/users', {\n    tags: { endpoint: 'users', env: 'prod' },\n  });\n}\n```\n\n---\n\n## CI/CD Integration\n\n### GitHub Actions\n\n```yaml\n# .github/workflows/load-test.yml\nname: Load Tests\n\non:\n  push:\n    branches: [main]\n  schedule:\n    - cron: '0 2 * * *'  # Daily at 2 AM\n\njobs:\n  load-test:\n    runs-on: ubuntu-latest\n    steps:\n      - uses: actions/checkout@v4\n      \n      - name: Setup k6\n        uses: grafana/k6-action@v0.2.0\n        \n      - name: Run load test\n        env:\n          API_TOKEN: ${{ secrets.API_TOKEN }}\n        run: k6 run --out json=results.json load-test.js\n        \n      - name: Upload results\n        uses: actions/upload-artifact@v4\n        with:\n          name: k6-results\n          path: results.json\n          \n      - name: Check thresholds\n        if: failure()\n        run: |\n          echo \"Load test failed thresholds!\"\n          exit 1\n```\n\n### GitLab CI\n\n```yaml\n# .gitlab-ci.yml\nload_test:\n  image: grafana/k6:latest\n  script:\n    - k6 run load-test.js\n  artifacts:\n    when: always\n    paths:\n      - results.json\n    reports:\n      junit: results.xml\n```\n\n---\n\n## Results Analysis\n\n### Built-in Reports\n\n```bash\n# Text summary\nk6 run load-test.js\n\n# JSON output for parsing\nk6 run --out json=results.json load-test.js\n\n# InfluxDB + Grafana\nk6 run --out influxdb=http://localhost:8086/k6 load-test.js\n\n# Prometheus remote write\nk6 run --out prometheus=localhost:9090/k6 load-test.js\n\n# Cloud results\nk6 run --out cloud load-test.js\n```\n\n### Interpreting Results\n\n| Metric | Description | Good | Warning | Bad |\n|--------|-------------|------|---------|-----|\n| http_req_duration (p95) | 95% response time | < 300ms | 300-500ms | > 500ms |\n| http_req_failed | Error rate | < 0.1% | 0.1-1% | > 1% |\n| http_reqs | Requests/sec | Meeting target | Near limit | At limit |\n| vus | Virtual users | Stable | Gradual increase | Unexpected spike |\n\n---\n\n## Examples\n\n### Example 1: Basic API Load Test\n\n```javascript\nimport http from 'k6/http';\nimport { check, sleep } from 'k6';\n\nexport const options = {\n  vus: 50,\n  duration: '2m',\n  thresholds: {\n    http_req_duration: ['p(95)<500'],\n    http_req_failed: ['rate<0.01'],\n  },\n};\n\nexport default function () {\n  const res = http.get('https://api.example.com/users');\n  \n  check(res, {\n    'status is 200': (r) => r.status === 200,\n    'response time < 500ms': (r) => r.timings.duration < 500,\n  });\n  \n  sleep(1);\n}\n```\n\n### Example 2: Test with Authentication and Data Parameterization\n\n```javascript\nimport http from 'k6/http';\nimport { check } from 'k6';\nimport { SharedArray } from 'k6/data';\n\nconst users = new SharedArray('users', function () {\n  return JSON.parse(open('./users.json'));\n});\n\nexport default function () {\n  const user = users[__VU % users.length];\n  \n  const loginRes = http.post('https://api.example.com/login',\n    JSON.stringify({ email: user.email, password: user.password })\n  );\n  \n  const token = loginRes.json('access_token');\n  \n  const headers = { 'Authorization': `Bearer ${token}` };\n  const res = http.get('https://api.example.com/profile', { headers });\n  \n  check(res, { 'profile loaded': (r) => r.status === 200 });\n}\n```\n\n---\n\n## Best Practices\n\n- **Start with smoke test**: Verify test works with 1-5 VUs before scaling up\n- **Use realistic data**: Parameterize with real user data and behaviors\n- **Set meaningful thresholds**: Match your SLA and business requirements\n- **Warm up systems**: Include ramp-up time in stages\n- **Monitor external dependencies**: Track not just your APIs but downstream services\n- **Use tags**: Tag requests for granular analysis (`tags: { endpoint: 'users' }`)\n- **Keep tests focused**: One test file per scenario for clarity\n\n---\n\n## Common Pitfalls\n\n- **Problem:** Tests pass locally but fail in CI\n  **Solution:** Ensure CI environment has similar resources and network conditions\n\n- **Problem:** Inconsistent results between runs\n  **Solution:** Check for external dependencies, random data, or test data pollution\n\n- **Problem:** k6 runs out of memory\n  **Solution:** Use ` SharedArray` for large data, reduce VUs, or use `--max-memory` flag\n\n- **Problem:** Thresholds too strict\n  **Solution:** Start with relaxed thresholds, tighten based on historical data\n\n---\n\n## Related Skills\n\n- `@performance-engineer` - For broader performance optimization\n- `@api-testing-observability-api-mock` - For API mocking during testing\n- `@application-performance-performance-optimization` - For performance optimization\n\n---\n\n## Additional Resources\n\n- [k6 Documentation](https://k6.io/docs/)\n- [k6 Examples](https://github.com/grafana/k6/tree/master/examples)\n- [k6 Load Testing Guides](https://k6.io/guides/)\n- [k6 Cloud](https://k6.io/cloud/)\n\n## Limitations\n- Use this skill only when the task clearly matches the scope described above.\n- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.\n- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are 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