Grafana k6 Has a Free API That Load Tests Your APIs With JavaScript

k6 is a load testing tool that uses JavaScript for test scripts. Run locally, in CI/CD, or in the cloud. Write tests like you write code — not XML configs. Quick Start # Install brew install k6 # macOS sudo apt install k6 # Ubuntu # Run a test k6 run script.js Basic Load Test import http from 'k6/http' import { check, sleep } from 'k6' export const options = { vus: 50, // 50 virtual users duration: '30s', // for 30 seconds } export default function () { const res = http.get('https://api.example.com/posts') check(res, { 'status is 200': (r) => r.status === 200, 'response time < 500ms': (r) => r.timings.duration < 500, }) sleep(1) } Ramping (Realistic Traffic Patterns) export const options = { stages: [ { duration: '2m', target: 100 }, // ramp up to 100 users { duration: '5m', target: 100 }, // stay at 100 { duration: '2m', target: 200 }, // spike to 200 { duration: '5m', target: 200 }, // stay at 200 { duration: '2m', target: 0 }, // ramp down ], } Thresholds (Pass/Fail Crit