Core Features

Basic Load Test

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

export const options = {
  vus: 10,          // Virtual users
  duration: '30s',  // Test duration
  thresholds: {
    http_req_duration: ['p(95)<500'], // 95% under 500ms
    http_req_failed: ['rate<0.01'],   // < 1% failure
  },
};

export default function () {
  const res = http.get('https://api.example.com/users');
  
  check(res, {
    'status is 200': (r) => r.status === 200,
    'response time < 500ms': (r) => r.timings.duration < 500,
  });
  
  sleep(1);
}

Load Profiles

export const options = {
  stages: [
    { duration: '2m', target: 100 },  // Ramp up
    { duration: '5m', target: 100 },  // Stay at 100
    { duration: '2m', target: 200 },  // Ramp to 200
    { duration: '5m', target: 200 },  // Stay at 200
    { duration: '2m', target: 0 },    // Ramp down
  ],
};

Best Practices

• Set realistic think time with sleep()
• Use checks for inline assertions
• Set thresholds for pass/fail criteria
• Start small and gradually increase load